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Journal articles on the topic 'Excitonic transport'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

MATSUI, A. H., M. TAKESHIMA, K. MIZUNO, and T. AOKI-MATSUMOTO. "PHOTOPHYSICAL OVERVIEW OF EXCITATION ENERGY TRANSFER IN ORGANIC MOLECULAR ASSEMBLIES — A ROUTE TO STUDY BIO-MOLECULAR ARRAYS —." International Journal of Modern Physics B 15, no. 28n30 (December 10, 2001): 3857–60. http://dx.doi.org/10.1142/s0217979201008846.

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Excitonic processes in organic molecular crystals are discussed in terms of two parameters, the crystal size and the constituent molecule size. From the luminescence and absorption spectra of a series of aromatic molecular crystals we find a systematic change in exciton energy transport as functions of the size of crystal and its constituent molecule size. Characteristic features of bulk crystals and microcrystallites are as follows. (1) In bulk crystals exciton energy transport depends on the constituent molecule size. When molecules are small, the exciton energy transport occurs by free excitons, but when molecules are large free exciton transport disappears because excitons get self-trapped. (2) In microcrystallites, exciton energy transport depends on the crystallite size. When the size is larger than a critical one, excitons travel as quantum mechanical waves but when the size is smaller than the critical one the exciton waves get confined within the crystallite. The results are independent of the chemical species of constituent molecules and thus applicable to novel molecular arrays such as biological molecular arrays.

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2

Fortin, E., S. Fafard, and André Mysyrowicz. "Exciton transport inCu2O: Evidence for excitonic superfluidity?" Physical Review Letters 70, no. 25 (June 21, 1993): 3951–54. http://dx.doi.org/10.1103/physrevlett.70.3951.

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3

Noltemeyer, Martin, Frank Bertram, Thomas Hempel, Barbara Bastek, Andrey Polyakov, Juergen Christen, Matthias Brandt, Michael Lorenz, and Marius Grundmann. "Excitonic transport in ZnO." Journal of Materials Research 27, no. 17 (June 14, 2012): 2225–31. http://dx.doi.org/10.1557/jmr.2012.139.

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4

Abramavicius, Darius, Vladimir Chorošajev, and Leonas Valkunas. "Tracing feed-back driven exciton dynamics in molecular aggregates." Physical Chemistry Chemical Physics 20, no. 33 (2018): 21225–40. http://dx.doi.org/10.1039/c8cp00682b.

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Excitation, exciton transport, dephasing and energy relaxation, and finally detection processes shift molecular systems into a specific superposition of quantum states causing localization, local heating and finally excitonic polaronic effects.

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5

Scholak, Torsten, Thomas Wellens, and Andreas Buchleitner. "Optimal networks for excitonic energy transport." Journal of Physics B: Atomic, Molecular and Optical Physics 44, no. 18 (September 14, 2011): 184012. http://dx.doi.org/10.1088/0953-4075/44/18/184012.

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6

Wolfe, J. P. "Imaging of excitonic transport in semiconductors." Journal of Luminescence 53, no. 1-6 (July 1992): 327–34. http://dx.doi.org/10.1016/0022-2313(92)90166-7.

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7

Benson, E., E. Fortin, and A. Mysyrowicz. "Anomalous exciton transport in Cu2O: Excitonic superfluidity or phonon-wind effect?" Solid State Communications 101, no. 5 (February 1997): 313–17. http://dx.doi.org/10.1016/s0038-1098(96)00600-x.

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8

Benson, E., E. Fortin, and A. Mysyrowicz. "Study of Anomalous Excitonic Transport in Cu2O." physica status solidi (b) 191, no. 2 (October 1, 1995): 345–67. http://dx.doi.org/10.1002/pssb.2221910211.

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9

Zhao, Hui, B. Dal Don, S. Moehl, and H. Kalt. "Non-classical excitonic transport in quantum wells." physica status solidi (b) 238, no. 3 (August 2003): 529–32. http://dx.doi.org/10.1002/pssb.200303181.

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10

Krasnok, Alexander, and Andrea Alù. "Valley-Selective Response of Nanostructures Coupled to 2D Transition-Metal Dichalcogenides." Applied Sciences 8, no. 7 (July 17, 2018): 1157. http://dx.doi.org/10.3390/app8071157.

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Monolayer (1L) transition-metal dichalcogenides (TMDCs) are attractive materials for several optoelectronic applications because of their strong excitonic resonances and valley-selective response. Valley excitons in 1L-TMDCs are formed at opposite points of the Brillouin zone boundary, giving rise to a valley degree of freedom that can be treated as a pseudospin, and may be used as a platform for information transport and processing. However, short valley depolarization times and relatively short exciton lifetimes at room temperature prevent using valley pseudospins in on-chip integrated valley devices. Recently, it was demonstrated how coupling these materials to optical nanoantennas and metasurfaces can overcome this obstacle. Here, we review the state-of-the-art advances in valley-selective directional emission and exciton sorting in 1L-TMDC mediated by nanostructures and nanoantennas. We briefly discuss the optical properties of 1L-TMDCs paying special attention to their photoluminescence/absorption spectra, dynamics of valley depolarization, and the valley Hall effect. Then, we review recent works on nanostructures for valley-selective directional emission from 1L-TMDCs.

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11

Wiersma, R. D., J. G. S. Lok, L. Tiemann, W. Dietsche, K. von Klitzing, W. Wegscheider, and D. Schuh. "Investigations of the νT=1 Exciton Condensate." International Journal of Modern Physics B 21, no. 08n09 (April 10, 2007): 1256–65. http://dx.doi.org/10.1142/s0217979207042719.

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Recent experiments on quantum Hall bilayers in the vicinity of total filling factor 1 (νT=1) have revealed the possibility of a superfluidic exciton condensate. We report on our experimental work involving the νT=1 exciton condensate in independently contacted bilayer two-dimensional electron systems. We reproduce the previously reported zero bias resonant tunneling peak, a quantized Hall drag resistivity, and in counter-flow configuration, the near vanishing of both ρxx and ρxy resistivity components. At balanced electron densities in the layers, we find for both drag and counter-flow current configurations, thermally activated transport with a monotonic increase of the activation energy for d/ℓB < 1.65 with activation energies up to 0.4 K. In the imbalanced system the activation energies show a striking asymmetry around the balance point, implying that the gap to charge excitations is considerably different in the separate layers that form the bilayer condensate. This indicates that the measured activation energy is neither the binding energy of the excitons, nor their condensation energy. We establish a phase diagram of the excitonic condensate showing the enhancement of this state at slight imbalances.

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12

Vercik, A., Y. Galvão Gobato, and M. J. S. P. Brasil. "Transport via excitonic complexes in resonant tunneling structures." Materials Science and Engineering: B 112, no. 2-3 (September 2004): 128–30. http://dx.doi.org/10.1016/j.mseb.2004.05.018.

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13

Ratner, M., A. Ratner, and T. Hryn’ova. "Excitonic energy transport in wide-band inorganic scintillators." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 486, no. 1-2 (June 2002): 463–70. http://dx.doi.org/10.1016/s0168-9002(02)00754-4.

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14

Park, Heechul, Nimrod Heldman, Patrick Rebentrost, Luigi Abbondanza, Alessandro Iagatti, Andrea Alessi, Barbara Patrizi, et al. "Enhanced energy transport in genetically engineered excitonic networks." Nature Materials 15, no. 2 (October 12, 2015): 211–16. http://dx.doi.org/10.1038/nmat4448.

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15

Goldberg, Omer, Yigal Meir, and Yonatan Dubi. "Vibration-Assisted and Vibration-Hampered Excitonic Quantum Transport." Journal of Physical Chemistry Letters 9, no. 11 (May 23, 2018): 3143–48. http://dx.doi.org/10.1021/acs.jpclett.8b00995.

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16

Dumcenco, Dumitru O., Ying Sheng Huang, Kwong Kau Tiong, Andrei Colev, Corneliu Gherman, and Leonid Kulyuk. "High-Temperature Optical Characterization of Transition Metal Dichalcogenides by Piezoreflectance Measurements." Solid State Phenomena 194 (November 2012): 158–61. http://dx.doi.org/10.4028/www.scientific.net/ssp.194.158.

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A systematic optical characterization of transition metal dichalcogenide layered crystals grown by chemical vapour transport method as well as of natural molybdenite were carried out by using piezoreflectance (PzR) measurements. From a detailed lineshape fit of the room-temperature PzR spectra over an energy range from 1.6 to 5.0 eV, the energies of the band-edge excitonic and higher lying interband direct transitions were determined accurately. The possible assignments of the different origins of excitonic transitions are discussed. The near direct band edge A and B excitonic transitions detected in PzR spectra show a linear red-shift with the temperature increasing up to 525 K. The values of temperature-dependent energies of the excitonic transitions A and B are evaluated and discussed.

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17

Li, Taotao, Yufeng Pan, Ze Wang, Yingdong Xia, Yonghua Chen, and Wei Huang. "Additive engineering for highly efficient organic–inorganic halide perovskite solar cells: recent advances and perspectives." Journal of Materials Chemistry A 5, no. 25 (2017): 12602–52. http://dx.doi.org/10.1039/c7ta01798g.

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18

So, Monica C., Gary P. Wiederrecht, Joseph E. Mondloch, Joseph T. Hupp, and Omar K. Farha. "Metal–organic framework materials for light-harvesting and energy transfer." Chemical Communications 51, no. 17 (2015): 3501–10. http://dx.doi.org/10.1039/c4cc09596k.

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19

Goker, A., and H. Aksu. "Quantum transport through a Coulomb blockaded quantum emitter coupled to a plasmonic dimer." Physical Chemistry Chemical Physics 18, no. 3 (2016): 1980–91. http://dx.doi.org/10.1039/c5cp06764b.

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20

Irgen-Gioro, Shawn, Karthik Gururangan, Rafael G. Saer, Robert E. Blankenship, and Elad Harel. "Electronic coherence lifetimes of the Fenna–Matthews–Olson complex and light harvesting complex II." Chemical Science 10, no. 45 (2019): 10503–9. http://dx.doi.org/10.1039/c9sc03501j.

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21

Lin, Der-Yuh, Hung-Pin Hsu, Chi-Feng Tsai, Cheng-Wen Wang, and Yu-Tai Shih. "Temperature Dependent Excitonic Transition Energy and Enhanced Electron-Phonon Coupling in Layered Ternary SnS2-xSex Semiconductors with Fully Tunable Stoichiometry." Molecules 26, no. 8 (April 10, 2021): 2184. http://dx.doi.org/10.3390/molecules26082184.

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In this study, a series of SnS2-xSex (0 ≤ x ≤ 2) layered semiconductors were grown by the chemical–vapor transport method. The crystal structural and material phase of SnS2-xSex layered van der Waals crystals was characterized by X-ray diffraction measurements and Raman spectroscopy. The temperature dependence of the spectral features in the vicinity of the direct band edge excitonic transitions of the layered SnS2-xSex compounds was measured in the temperature range of 20–300 K using the piezoreflectance (PzR) technique. The near band-edge excitonic transition energies of SnS2-xSex were determined from a detailed line-shape fit of the PzR spectra. The PzR characterization has shown that the excitonic transitions were continuously tunable with the ratio of S and Se. The parameters that describe the temperature variation of the energies of the excitonic transitions are evaluated and discussed.

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22

Tang, Zhaojun, Tingting Xu, Sen Li, Zhifeng Shi, and Xinjian Li. "Room-temperature excitonic emission with a phonon replica from graphene nanosheets deposited on Ni-nanocrystallites/Si-nanoporous pillar array." Royal Society Open Science 5, no. 8 (August 2018): 172238. http://dx.doi.org/10.1098/rsos.172238.

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Graphene nanosheets (GNSs) were grown on a Si nanoporous pillar array (Si-NPA) via chemical vapour deposition, using a thin layer of pre-deposited Ni nanocrystallites as catalyst. GNSs were determined to be of high quality and good dispersivity, with a typical diameter size of 15 × 8 nm. Light absorption measurements showed that GNSs had an absorption band edge at 3.3 eV. They also showed sharp and regular excitonic emitting peaks in the ultraviolet and visible region (2.06–3.6 eV). Moreover, phonon replicas with long-term stability appeared with the excitonic peaks at room temperature. Temperature-dependent photoluminescence from the GNSs revealed that the excitonic emission derived from free and bound excitonic recombination. A physical model based on band energy theory was constructed to analyse the carrier transport of GNSs. The Ni nanocrystallites on Si-NPA, which acted as a metal-enhanced fluorescence substrate, were supposed to accelerate the excitonic recombination of GNSs and enhanced the measured emission intensity. Results of this study would be valuable in determining the luminescence mechanism of GNSs and could be applied in real-world optoelectronic devices.

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23

LEE, Hyun Seok. "Defects and Optoelectronic Properties in 2D Semiconductors." Physics and High Technology 29, no. 9 (September 30, 2020): 11–14. http://dx.doi.org/10.3938/phit.29.031.

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Two-dimensional (2D) van der Waals semiconductors have potential for various optoelectronic applications, owing to their unique optical and electrical properties at an atomic layer thickness. A stable excitonic emission from 2D monolayer semiconductors at room temperature, owing to a reduced dielectric screening effect, opens new fields of research on excitonics and valleytronics. Moreover, their low dimensionality without surface dangling bonds allows for unique quantum transport phenomena via artificial van der Waals stacking using a versatile library of 2D materials. In this article, the author introduces the tunable quantum optoelectronic properties of 2D semiconductors by manipulating native defects, van der Waals interfaces, Coulomb interactions, etc. Additionally, the author reviews the electronic and the optoelectronic applications utilizing such unique tunable properties of 2D semiconductors.

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24

Boev, M. V., L. S. Braginskii, V. M. Kovalev, L. I. Magarill, M. M. Mahmoodian, and M. V. Entin. "Transport Properties of Two-Dimensional Topological Insulators and Excitonic Condensates." Optoelectronics, Instrumentation and Data Processing 56, no. 5 (September 2020): 545–52. http://dx.doi.org/10.3103/s8756699020050027.

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25

Fadil, Dalal, Ridwan F. Hossain, Gustavo A. Saenz, and Anupama B. Kaul. "On the chemically-assisted excitonic enhancement in environmentally-friendly solution dispersions of two-dimensional MoS2 and WS2." Journal of Materials Chemistry C 5, no. 22 (2017): 5323–33. http://dx.doi.org/10.1039/c7tc01001j.

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Terpineol leads to effective exfoliation and excitonic enhancement in solution dispersions of MoS₂ and WS₂, which also yields enhancement in electronic transport properties. Such dispersions are amenable to high-performance electronic and opto-electronic devices using manufacturable routes.

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26

Bretscher, Hope M., Paolo Andrich, Yuta Murakami, Denis Golež, Benjamin Remez, Prachi Telang, Anupam Singh, et al. "Imaging the coherent propagation of collective modes in the excitonic insulator Ta2NiSe5 at room temperature." Science Advances 7, no. 28 (July 2021): eabd6147. http://dx.doi.org/10.1126/sciadv.abd6147.

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Excitonic insulators host a condensate of electron-hole pairs at equilibrium, giving rise to collective many-body effects. Although several materials have emerged as excitonic insulator candidates, evidence of long-range coherence is lacking and the origin of the ordered phase in these systems remains controversial. Here, using ultrafast pump-probe microscopy, we investigate the possible excitonic insulator Ta2NiSe5. Below 328 K, we observe the anomalous micrometer-scale propagation of coherent modes at velocities of ~105 m/s, which we attribute to the hybridization between phonon modes and the phase mode of the condensate. We develop a theoretical framework to support this explanation and propose that electronic interactions provide a substantial contribution to the ordered phase in Ta2NiSe5. These results allow us to understand how the condensate’s collective modes transport energy and interact with other degrees of freedom. Our study provides a unique paradigm for the investigation and manipulation of these properties in strongly correlated materials.

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27

Zhang, Yang, Shulin Gu, Kun Tang, Jiandong Ye, Haixiong Ge, Zhengrong Yao, Shunming Zhu, and Youdou Zheng. "Fabrication and Characterization of Highly Oriented N-Doped ZnO Nanorods by Selective Area Epitaxy." Journal of Nanomaterials 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/854074.

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High-quality nitrogen-doped ZnO nanorods have been selectively grown on patterned and bare ZnO templates by the combination of nanoimprint lithography and chemical vapor transport methods. The grown nanorods exhibited uniformity in size and orientation as well as controllable density and surface-to-volume ratio. The structural and optical properties of ZnO nanorods and the behaviour of N dopants have been investigated by means of the scanning electron microscope, photoluminescence (PL) spectra, and Raman scattering spectra. The additional vibration modes observed in Raman spectra of N-doped ZnO nanorods provided solid evidence of N incorporation in ZnO nanorods. The difference of excitonic emissions from ZnO nanorods with varied density and surface-to-volume ratio suggested the different spatial distribution of intrinsic defects. It was found that the defects giving rise to acceptor-bound exciton (A0X) emission were most likely to distribute in the sidewall surface with nonpolar characteristics, while the donor bound exciton (D0X) emission related defects distributed uniformly in the near top polar surface.

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28

Bondkowski, J., I. Bleyl, D. Haarer, and D. Adam. "Excitonic versus transport dominated charge injection at a dye photoconductor interface." Chemical Physics Letters 283, no. 3-4 (February 1998): 207–14. http://dx.doi.org/10.1016/s0009-2614(97)01349-3.

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29

Snoke, D., S. Denev, Y. Liu, L. Pfeiffer, and K. West. "Long-range transport in excitonic dark states in coupled quantum wells." Nature 418, no. 6899 (August 2002): 754–57. http://dx.doi.org/10.1038/nature00940.

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30

Bouzrara, L., R. Ajjel, H. Mejri, M. A. Zaidi, S. Alaya, J. Mimila-Arroyo, and H. Maaref. "Excitonic recombination processes in GaAs grown by close-space vapour transport." Microelectronics Journal 35, no. 7 (July 2004): 577–80. http://dx.doi.org/10.1016/j.mejo.2004.03.002.

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31

Mizeikis, V., V. G. Lyssenko, J. Erland, and J. M. Hvam. "Excitonic optical nonlinearities and transport in the layered compound semiconductor GaSe." Physical Review B 51, no. 23 (June 15, 1995): 16651–59. http://dx.doi.org/10.1103/physrevb.51.16651.

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32

Köse, Muhammet E. "Evaluation of Excitonic Coupling and Charge Transport Integrals in P3HT Nanocrystal." Journal of Physical Chemistry C 115, no. 26 (June 13, 2011): 13076–82. http://dx.doi.org/10.1021/jp203497e.

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33

Schaefer, A. C., J. Erland, and D. G. Steel. "Nondiffusive excitonic transport in GaAs and the effects of momentum scattering." Physical Review B 54, no. 16 (October 15, 1996): R11046—R11049. http://dx.doi.org/10.1103/physrevb.54.r11046.

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34

Eisfeld, Alexander. "Phase directed excitonic transport and its limitations due to environmental influence." Chemical Physics 379, no. 1-3 (January 2011): 33–38. http://dx.doi.org/10.1016/j.chemphys.2010.10.013.

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35

Choi, M. Y., and M. Lee. "Phase transition and persistent current via excitonic transport in coupled Josephson necklaces." Current Applied Physics 2, no. 1 (February 2002): 11–16. http://dx.doi.org/10.1016/s1567-1739(01)00097-9.

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36

Korsakas, S., J. Bučinskas, and D. Abramavicius. "Long memory effects in excitonic systems dynamics: Spectral relations and excitation transport." Journal of Chemical Physics 152, no. 24 (June 28, 2020): 244114. http://dx.doi.org/10.1063/5.0009926.

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37

Guimarães, José Diogo, Carlos Tavares, Luís Soares Barbosa, and Mikhail I. Vasilevskiy. "Simulation of Nonradiative Energy Transfer in Photosynthetic Systems Using a Quantum Computer." Complexity 2020 (September 16, 2020): 1–12. http://dx.doi.org/10.1155/2020/3510676.

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Photosynthesis is an important and complex physical process in nature, whose comprehensive understanding would have many relevant industrial applications, for instance, in the field of energy production. In this paper, we propose a quantum algorithm for the simulation of the excitonic transport of energy, occurring in the first stage of the process of photosynthesis. The algorithm takes in account the quantum and environmental effects (pure dephasing), influencing the quantum transport. We performed quantum simulations of such phenomena, for a proof of concept scenario, in an actual quantum computer, IBM Q, of 5 qubits. We validate the results with the Haken-Ströbl model and discuss the influence of environmental parameters on the efficiency of the energy transport.

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38

Wang, Qian, Liyuan Wu, Alexander Urban, Huawei Cao, and Pengfei Lu. "Anisotropic to Isotropic Transition in Monolayer Group-IV Tellurides." Materials 14, no. 16 (August 11, 2021): 4495. http://dx.doi.org/10.3390/ma14164495.

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Monolayer group-IV tellurides with phosphorene-derived structures are attracting increasing research interest because of their unique properties. Here, we systematically studied the quasiparticle electronic and optical properties of two-dimensional group-IV tellurides (SiTe, GeTe, SnTe, PbTe) using the GW and Bethe–Salpeter equation method. The calculations revealed that all group-IV tellurides are indirect bandgap semiconductors except for monolayer PbTe with a direct gap of 1.742 eV, while all of them are predicted to have prominent carrier transport ability. We further found that the excitonic effect has a significant impact on the optical properties for monolayer group-IV tellurides, and the predicted exciton binding energy is up to 0.598 eV for SiTe. Interestingly, the physical properties of monolayer group-IV tellurides were subject to an increasingly isotropic trend: from SiTe to PbTe, the differences of the calculated quasiparticle band gap, optical gap, and further exciton binding energy along different directions tended to decrease. We demonstrated that these anisotropic electronic and optical properties originate from the structural anisotropy, which in turn is the result of Coulomb repulsion between non-bonding electron pairs. Our theoretical results provide a deeper understanding of the anisotropic properties of group-IV telluride monolayers.

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39

Shen, J. X., Y. Oka, W. Ossau, G. Landwehr, K. J. Friedland, R. Hey, K. Ploog, and G. Weimann. "Vertical transport of photo-excited carriers for excitonic recombinations in modulation doped heterojunctions." Solid State Communications 106, no. 8 (May 1998): 495–99. http://dx.doi.org/10.1016/s0038-1098(98)00092-1.

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40

Tiemann, L., J. G. S. Lok, W. Dietsche, K. von Klitzing, K. Muraki, D. Schuh, and W. Wegscheider. "Investigating the transport properties of the excitonic state in quasi-Corbino electron bilayers." Physica E: Low-dimensional Systems and Nanostructures 40, no. 5 (March 2008): 1034–37. http://dx.doi.org/10.1016/j.physe.2007.09.148.

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41

Collins, R. T., L. Viña, W. I. Wang, K. v. Klitzing, and K. Ploog. "Excitonic transitions and optically excited transport in quantum wells in an electric field." Superlattices and Microstructures 3, no. 3 (January 1987): 291–93. http://dx.doi.org/10.1016/0749-6036(87)90075-9.

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42

Муслимов, А. Э., И. Д. Веневцев, Л. А. Задорожная, П. А. Родный, and В. М. Каневский. "Рентгенолюминесценция нитевидных микроструктур ZnO." Письма в журнал технической физики 46, no. 14 (2020): 43. http://dx.doi.org/10.21883/pjtf.2020.14.49667.18159.

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The morphology, optical and luminescent properties of an ensemble of ZnO whisker microcrystals on sapphire substrate obtained by gas transport synthesis from zinc and oxygen vapors by the vapor – liquid – crystal mechanism are studied. The ensemble is formed by uniaxial ZnO microcrystallites of two morphologies: a combination of a hexagonal prism and single crystal microrods. The absorption edge of the ensemble of whisker microstructures is located in the 385-395 nm region. The total transmittance of the sample in the visible and near-infrared regions is around 10–20% with a layer thickness around 15–18 μm. The X-ray luminescence spectrum is represented by two bands: narrow peak of excitonic emission with a maximum at 388.3 nm and wide peak of defect-related luminescence in the region of 430–600 nm. The decay time constant for excitonic luminescence is around 1.1 ns (not accounted for the width of the excitation pulse), which was obtained for the first time in undoped ZnO microstructures.

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43

Ozaki, Shunji, and Kazuya Matsumoto. "Growth of ZnSe Nanowires and their Photoluminescence Spectra." Key Engineering Materials 790 (November 2018): 55–59. http://dx.doi.org/10.4028/www.scientific.net/kem.790.55.

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Zinc selenide (ZnSe) nanowires were grown on Si and fused quartz substrates by a simple vapor transport method of heating the ZnSe powder at 1100 °C in a tube of the furnace. The obtained yellow colored product has indicated to be the high density of ZnSe nanowires with diameters ranging from 50 to 200 nm. Low-temperature photoluminescence spectra for ZnSe nanowires show near band-edge emissions. The free excitonic emissions were observed at ~2.8 eV.

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44

PORTUGALL, OLIVER. "GENERAL OVERVIEW OVER INVESTIGATIONS ON LOW-DIMENSIONAL CARBON-BASED MATERIALS IN MAGNETIC FIELDS ABOVE 50 T." International Journal of Modern Physics B 23, no. 12n13 (May 20, 2009): 2777–78. http://dx.doi.org/10.1142/s0217979209062359.

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Carbon nanotubes have been intensively investigated in pulsed magnetic fields, mainly to identify the effect of a magnetic flux along the tube axis on the energy band structure. Clear manifestations of the Ahoronov-Bohm effect have been observed in near-infrared absorption measurements on suspended tubes1 as well as in single-tube transport experiments.2 Subsequent studies have shed light on the excitonic nature of optical excitations3 and the magnetic-field induced optical activity of such excitons.4,5 Ongoing activities are focussing on the magnetic alignment dynamics of carbon nanotubes in liquid suspension which has the potential to provide valuable information on their magnetic susceptibility. Experimental investigations on graphene in pulsed magnetic fields are far less advanced than those on carbon nanotubes. This is due to various experimental factors such as intrinsically short integration times for optical experiments and the destructive effect of electromagnetic perturbations on insufficiently screened transport samples. First results have nevertheless been obtained in both cases: Previous absorption measurements6 up to 32 T have been extended to higher fields thereby confirming the characteristic B1/2-dependence of energy levels. Transport measurements, on the other hand, have revealed extended plateaus in the two-terminal resistance of graphene.7 In this talk we gave a complete overview over recent and ongoing experimental investigations on carbon nanotubes and graphene in magnetic fields above 50 T. We referred to the work of several international collaborations including groups from Houston, Los Alamos, Berlin, Oxford, Tokyo, Dublin, Grenoble and Toulouse. Note from Publisher: This article contains the abstract only.

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Kurian, P., T. O. Obisesan, and T. J. A. Craddock. "Oxidative species-induced excitonic transport in tubulin aromatic networks: Potential implications for neurodegenerative disease." Journal of Photochemistry and Photobiology B: Biology 175 (October 2017): 109–24. http://dx.doi.org/10.1016/j.jphotobiol.2017.08.033.

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Marcus, Max, George C. Knee, and Animesh Datta. "Towards a spectroscopic protocol for unambiguous detection of quantum coherence in excitonic energy transport." Faraday Discussions 221 (2020): 110–32. http://dx.doi.org/10.1039/c9fd00068b.

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Shahini, Ali. "An organic solar cell theoretical model with two concepts of excitonic and bipolar transport." Asia-Pacific Journal of Chemical Engineering 8, no. 1 (February 28, 2012): 59–68. http://dx.doi.org/10.1002/apj.1624.

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Gilliland, G. D., M. S. Petrovic, H. P. Hjalmarson, D. J. Wolford, G. A. Northrop, T. F. Kuech, L. M. Smith, and J. A. Bradley. "Time-dependent heterointerfacial band bending and quasi-two-dimensional excitonic transport in GaAs structures." Physical Review B 58, no. 8 (August 15, 1998): 4728–32. http://dx.doi.org/10.1103/physrevb.58.4728.

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Movaghar, B. "Physics of microstructures." Canadian Journal of Physics 67, no. 4 (April 1, 1989): 304–10. http://dx.doi.org/10.1139/p89-053.

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A brief review is presented of the novel physics associated with submicrometre structures produced by molecular beam epitaxy and electron beam lithography. In low-temperature transport, the most important effect is the achievement of extraordinary long coherence lengths (10 μm) or high mobilities for carriers moving in two dimensions and constructed topologies. Ballistic motion, fractional quantum Hall effect, and Bohm–Aharonov interference are direct consequences. When barriers are present in multiple quantum well and superlattice structures, we have resonant tunnelling, Stark localization, and magneto-Stark transport. In optics, the main novelty is the consequence of the quantum well confinement, giving rise to sharp inter-subband transitions and excitonic effects. The strongly wavelength-dependent absorption can be of considerable importance in photodiodes, wavelength demultiplexers, and infrared detectors.

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Hsu, Hung-Pin, Der-Yuh Lin, Jhin-Jhong Jheng, Pin-Cheng Lin, and Tsung-Shine Ko. "High Optical Response of Niobium-Doped WSe2-Layered Crystals." Materials 12, no. 7 (April 10, 2019): 1161. http://dx.doi.org/10.3390/ma12071161.

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The optical properties of WSe2-layered crystals doped with 0.5% niobium (Nb) grown by the chemical vapor transport method were characterized by piezoreflectance (PzR), photoconductivity (PC) spectroscopy, frequency-dependent photocurrent, and time-resolved photoresponse. With the incorporation of 0.5% Nb, the WSe2 crystal showed slight blue shifts in the near band edge excitonic transitions and exhibited strongly enhanced photoresponsivity. Frequency-dependent photocurrent and time-resolved photoresponse were measured to explore the kinetic decay processes of carriers. Our results show the potential application of layered crystals for photodetection devices based on Nb-doped WSe2-layered crystals.

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