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Journal articles on the topic 'Coherent generation of excitonic complex states'

Author: Grafiati

Published: 6 September 2023

Last updated: 7 September 2023

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1

Hoyer, Stephan, Filippo Caruso, Simone Montangero, et al. "Realistic and verifiable coherent control of excitonic states in a light-harvesting complex." New Journal of Physics 16, no. 4 (2014): 045007. http://dx.doi.org/10.1088/1367-2630/16/4/045007.

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2

Miao, Yin, Cheng Ze, and Shen Lei-Lei. "Generation of Entanglement for Coherent Excitonic States in Coupled Quantum Dots in a Microcavity." Communications in Theoretical Physics 50, no. 3 (2008): 661–63. http://dx.doi.org/10.1088/0253-6102/50/3/27.

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3

Beun, Robbert-Jan. "On the generation of coherent dialogue." Pragmatics and Cognition 9, no. 1 (2001): 37–68. http://dx.doi.org/10.1075/pc.9.1.03beu.

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A dialogue game is presented that enables us to generate coherent elementary conversational sequences at the speech act level. Central to this approach is the fact that the cognitive states of players change as a result of the interpretation of speech acts and that these changes provoke the production of a subsequent speech act. The rules of the game are roughly based on the Gricean maxims of co-operation — i.e., agents are forbidden to put forward information they do not believe and are forbidden to ask anything they already believe; the Gricean maxim of relevance is determined by a so-called

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4

Wu, Weijun, Andrew E. Sifain, Courtney A. Delpo, and Gregory D. Scholes. "Polariton enhanced free charge carrier generation in donor–acceptor cavity systems by a second-hybridization mechanism." Journal of Chemical Physics 157, no. 16 (2022): 161102. http://dx.doi.org/10.1063/5.0122497.

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Cavity quantum electrodynamics has been studied as a potential approach to modify free charge carrier generation in donor–acceptor heterojunctions because of the delocalization and controllable energy level properties of hybridized light–matter states known as polaritons. However, in many experimental systems, cavity coupling decreases charge separation. Here, we theoretically study the quantum dynamics of a coherent and dissipative donor–acceptor cavity system, to investigate the dynamical mechanism and further discover the conditions under which polaritons may enhance free charge carrier gen

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Mattiotti, Francesco, Mohan Sarovar, Giulio G. Giusteri, Fausto Borgonovi, and G. Luca Celardo. "Efficient light harvesting and photon sensing via engineered cooperative effects." New Journal of Physics 24, no. 1 (2022): 013027. http://dx.doi.org/10.1088/1367-2630/ac4127.

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Abstract Efficient devices for light harvesting and photon sensing are fundamental building blocks of basic energy science and many essential technologies. Recent efforts have turned to biomimicry to design the next generation of light-capturing devices, partially fueled by an appreciation of the fantastic efficiency of the initial stages of natural photosynthetic systems at capturing photons. In such systems extended excitonic states are thought to play a fundamental functional role, inducing cooperative coherent effects, such as superabsorption of light and supertransfer of photoexcitations.

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Han, Koohee, Gašper Kokot, Oleh Tovkach, Andreas Glatz, Igor S. Aranson, and Alexey Snezhko. "Emergence of self-organized multivortex states in flocks of active rollers." Proceedings of the National Academy of Sciences 117, no. 18 (2020): 9706–11. http://dx.doi.org/10.1073/pnas.2000061117.

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Active matter, both synthetic and biological, demonstrates complex spatiotemporal self-organization and the emergence of collective behavior. A coherent rotational motion, the vortex phase, is of great interest because of its ability to orchestrate well-organized motion of self-propelled particles over large distances. However, its generation without geometrical confinement has been a challenge. Here, we show by experiments and computational modeling that concentrated magnetic rollers self-organize into multivortex states in an unconfined environment. We find that the neighboring vortices more

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7

Markmann, Sergej, Martin Franckié, Shovon Pal, et al. "Two-dimensional spectroscopy on a THz quantum cascade structure." Nanophotonics 10, no. 1 (2020): 171–80. http://dx.doi.org/10.1515/nanoph-2020-0369.

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AbstractUnderstanding and controlling the nonlinear optical properties and coherent quantum evolution of complex multilevel systems out of equilibrium is essential for the new semiconductor device generation. In this work, we investigate the nonlinear system properties of an unbiased quantum cascade structure by performing two-dimensional THz spectroscopy. We study the time-resolved coherent quantum evolution after it is driven far from equilibrium by strong THz pulses and demonstrate the existence of multiple nonlinear signals originating from the engineered subbands and find the lifetimes of

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Petruhanov, Vadim N., and Alexander N. Pechen. "Quantum Gate Generation in Two-Level Open Quantum Systems by Coherent and Incoherent Photons Found with Gradient Search." Photonics 10, no. 2 (2023): 220. http://dx.doi.org/10.3390/photonics10020220.

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In this work, we consider an environment formed by incoherent photons as a resource for controlling open quantum systems via an incoherent control. We exploit a coherent control in the Hamiltonian and an incoherent control in the dissipator which induces the time-dependent decoherence rates γk(t) (via time-dependent spectral density of incoherent photons) for generation of single-qubit gates for a two-level open quantum system which evolves according to the Gorini–Kossakowski–Sudarshan–Lindblad (GKSL) master equation with time-dependent coefficients determined by these coherent and incoherent

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Yamane, Hidemasa, and Satoshi Tanaka. "Ultrafast Dynamics of High-Harmonic Generation in Terms of Complex Floquet Spectral Analysis." Symmetry 10, no. 8 (2018): 313. http://dx.doi.org/10.3390/sym10080313.

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We studied the high-harmonic generation (HHG) of a two-level-system (TLS) driven by an intense monochromatic phase-locked laser based on complex spectral analysis with the Floquet method. In contrast with phenomenological approaches, this analysis deals with the whole process as a coherent quantum process based on microscopic dynamics. We have obtained the time-frequency resolved spectrum of spontaneous HHG single-photon emission from an excited TLS driven by a laser field. Characteristic spectral features of the HHG, such as the plateau and cutoff, are reproduced by the present model. Because

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Bienfait, A., K. J. Satzinger, Y. P. Zhong, et al. "Phonon-mediated quantum state transfer and remote qubit entanglement." Science 364, no. 6438 (2019): 368–71. http://dx.doi.org/10.1126/science.aaw8415.

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Phonons, and in particular surface acoustic wave phonons, have been proposed as a means to coherently couple distant solid-state quantum systems. Individual phonons in a resonant structure can be controlled and detected by superconducting qubits, enabling the coherent generation and measurement of complex stationary phonon states. We report the deterministic emission and capture of itinerant surface acoustic wave phonons, enabling the quantum entanglement of two superconducting qubits. Using a 2-millimeter-long acoustic quantum communication channel, equivalent to a 500-nanosecond delay line,

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Gu, Xuemei, Manuel Erhard, Anton Zeilinger, and Mario Krenn. "Quantum experiments and graphs II: Quantum interference, computation, and state generation." Proceedings of the National Academy of Sciences 116, no. 10 (2019): 4147–55. http://dx.doi.org/10.1073/pnas.1815884116.

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We present an approach to describe state-of-the-art photonic quantum experiments using graph theory. There, the quantum states are given by the coherent superpositions of perfect matchings. The crucial observation is that introducing complex weights in graphs naturally leads to quantum interference. This viewpoint immediately leads to many interesting results, some of which we present here. First, we identify an experimental unexplored multiphoton interference phenomenon. Second, we find that computing the results of such experiments is #P-hard, which means it is a classically intractable prob

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McDonnell, Jessica, Nicholas P. Murray, Sungwoo Ahn, Stefan Clemens, Erik Everhart, and J. Chris Mizelle. "Examination and Comparison of Theta Band Connectivity in Left- and Right-Hand Dominant Individuals throughout a Motor Skill Acquisition." Symmetry 13, no. 4 (2021): 728. http://dx.doi.org/10.3390/sym13040728.

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The majority of the population identifies as right-hand dominant, with a minority 10.6% identifying as left-hand dominant. Social factors may partially skew the distribution, but it remains that left-hand dominant individuals make up approximately 40 million people in the United States alone and yet, remain underrepresented in the motor control literature. Recent research has revealed behavioral and neurological differences between populations, therein overturning assumptions of a simple hemispheric flip in motor-related activations. The present work showed differentially adaptable motor progr

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13

Tucker, Katherine L. "Dietary patterns, approaches, and multicultural perspectiveThis is one of a selection of papers published in the CSCN–CSNS 2009 Conference, entitled Can we identify culture-specific healthful dietary patterns among diverse populations undergoing nutrition transition?" Applied Physiology, Nutrition, and Metabolism 35, no. 2 (2010): 211–18. http://dx.doi.org/10.1139/h10-010.

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Nutrition research has traditionally focused on single nutrients in relation to health. However, recent appreciation of the complex synergistic interactions among nutrients and other food constituents has led to a growing interest in total dietary patterns. Methods of measurement include summation of food or nutrient recommendations met, such as the United States Department of Agriculture Healthy Eating Index; data-driven approaches — principal components (PCA) and cluster analyses — which describe actual intake patterns in the population; and, most recently, reduced rank regression, which def

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14

Sebastiani, Paola, Marco F. Ramoni, Vikki Nolan, Clinton T. Baldwin, and Martin H. Steinberg. "Multigenic Dissection and Prognostic Modeling of Overt Stroke in Sickle Cell Anemia." Blood 104, no. 11 (2004): 1655. http://dx.doi.org/10.1182/blood.v104.11.1655.1655.

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Abstract Stroke is a major vascular complication of sickle cell anemia, more frequent in patients under the age of 20 years. Transcranial Doppler (TCD) flow studies can predict the likelihood of stroke in children with sickle cell anemia, but only 10% of individuals with abnormal TCD values will have stroke, and stroke will occur in some individuals with normal TCD. Therefore, more precise means of prognosis would be welcome so that prophylactic treatments like transfusions or hydroxyurea can be targeted to individuals at highest risk. Using Bayesian networks (BNs), we analyzed 235 single nucl

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15

Hunt, Sylvia J. "Muslim Communities in the New Europe." American Journal of Islam and Society 15, no. 2 (1998): 129–37. http://dx.doi.org/10.35632/ajis.v15i2.2186.

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Although Muslim Communities in the New Europe is long and complex, it isnot obscure, and each of its sixteen chapters can be read as a separate entity. The contributors are seventeen academics from universities in various countries ofEastern and Western Europe, as well as the three editors who are based at threeEnglish universities. A short preface is followed by the first chapter, which isalso the first part of the book, appropriately titled “Themes and Puzzles.” Theremaining chapters examine selected countries individually in Eastern andWestem Europe in parts I1 and 111, respectively. Each c

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16

Opderbeck, David W. "The End of the Law? Law, Theology, and Neuroscience." Perspectives on Science and Christian Faith 75, no. 1 (2023): 75–77. http://dx.doi.org/10.56315/pscf3-23opderbeck.

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THE END OF THE LAW? Law, Theology, and Neuroscience by David W. Opderbeck. Eugene, OR: Cascade, 2021. 260 pages. Paperback; $31.00. ISBN: 9781498223898. *"It's not you but your brain." As this powerful meme has begun to characterise our generation, we encounter children under neurological treatment for their behavioral/mental deficits and seniors losing their self-identity due to neurological degeneration. It is indeed evident that our mental experiences are bound to our brain states--yet are we really nothing else than our brain? Many intellectuals of our day argue so--our psyche is an epiphe

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17

Zhou, Renlong, Alex Krasnok, Naveed Hussain, Sa Yang, and Kaleem Ullah. "Controlling the harmonic generation in transition metal dichalcogenides and their heterostructures." Nanophotonics, April 26, 2022. http://dx.doi.org/10.1515/nanoph-2022-0159.

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Abstract The growing interest in transition metal dichalcogenides (TMDs) has encouraged researchers to focus on their nonlinear optical properties, such as harmonic generation (HG), which has potential for fundamental science and applications. HG is a nonlinear phenomenon used to study low-dimensional physics and has applications in bioimaging, optical signal processing, and novel coherent light sources. In this review, we present the state-of-the-art advances of HG in atomically-thin TMDs and their heterostructures. Different factors affecting the HG in TMDs such as strain, electric gating, e

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18

Wang, Yuhan, Zhonghui Nie, and Fengqiu Wang. "Modulation of photocarrier relaxation dynamics in two-dimensional semiconductors." Light: Science & Applications 9, no. 1 (2020). http://dx.doi.org/10.1038/s41377-020-00430-4.

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AbstractDue to strong Coulomb interactions, two-dimensional (2D) semiconductors can support excitons with large binding energies and complex many-particle states. Their strong light-matter coupling and emerging excitonic phenomena make them potential candidates for next-generation optoelectronic and valleytronic devices. The relaxation dynamics of optically excited states are a key ingredient of excitonic physics and directly impact the quantum efficiency and operating bandwidth of most photonic devices. Here, we summarize recent efforts in probing and modulating the photocarrier relaxation dy

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19

Li, Ziqi, Bo Peng, Miao-Ling Lin, et al. "Phonon-assisted electronic states modulation of few-layer PdSe2 at terahertz frequencies." npj 2D Materials and Applications 5, no. 1 (2021). http://dx.doi.org/10.1038/s41699-021-00268-3.

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AbstractInformation technology demands high-speed optoelectronic devices, but going beyond the one terahertz (THz) barrier is challenging due to the difficulties associated with generating, detecting, and processing high-frequency signals. Here, we show that femtosecond-laser-driven phonons can be utilized to coherently manipulate the excitonic properties of semiconductors at THz frequencies. The precise control of the pump and subsequent time-delayed broadband probe pulses enables the simultaneous generation and detection processes of both periodic lattice vibrations and their couplings with

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20

Cai, Rui, Indrajit Wadgaonkar, Jia Wei Melvin Lim, et al. "Zero-field quantum beats and spin decoherence mechanisms in CsPbBr3 perovskite nanocrystals." Nature Communications 14, no. 1 (2023). http://dx.doi.org/10.1038/s41467-023-37721-4.

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AbstractCoherent optical manipulation of exciton states provides a fascinating approach for quantum gating and ultrafast switching. However, their coherence time for incumbent semiconductors is highly susceptible to thermal decoherence and inhomogeneous broadening effects. Here, we uncover zero-field exciton quantum beating and anomalous temperature dependence of the exciton spin lifetimes in CsPbBr3 perovskite nanocrystals (NCs) ensembles. The quantum beating between two exciton fine-structure splitting (FSS) levels enables coherent ultrafast optical control of the excitonic degree of freedom

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21

Lin, Kai-Qiang, Chin Shen Ong, Sebastian Bange, et al. "Narrow-band high-lying excitons with negative-mass electrons in monolayer WSe2." Nature Communications 12, no. 1 (2021). http://dx.doi.org/10.1038/s41467-021-25499-2.

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AbstractMonolayer transition-metal dichalcogenides (TMDCs) show a wealth of exciton physics. Here, we report the existence of a new excitonic species, the high-lying exciton (HX), in single-layer WSe2 with an energy of ~3.4 eV, almost twice the band-edge A-exciton energy, with a linewidth as narrow as 5.8 meV. The HX is populated through momentum-selective optical excitation in the K-valleys and is identified in upconverted photoluminescence (UPL) in the UV spectral region. Strong electron-phonon coupling results in a cascaded phonon progression with equidistant peaks in the luminescence spect

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22

Chen, Lu, Wenqi Zhu, Pengcheng Huo, et al. "Synthesizing ultrafast optical pulses with arbitrary spatiotemporal control." Science Advances 8, no. 43 (2022). http://dx.doi.org/10.1126/sciadv.abq8314.

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The ability to control the instantaneous state of light, from high-energy pulses down to the single-photon level, is an indispensable requirement in photonics. This has, for example, facilitated spatiotemporal probing and coherent control of ultrafast light-matter interactions, and enabled capabilities such as generation of exotic states of light with complexity, or at wavelengths, that are not easily accessible. Here, by leveraging the multifunctional control of light at the nanoscale offered by metasurfaces embedded in a Fourier transform setup, we present a versatile approach to synthesize

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23

Gerardino, A., M. Francardi, A. Gaggero, et al. "Nanophotonic technologies for single-photon devices." Opto-Electronics Review 18, no. 4 (2010). http://dx.doi.org/10.2478/s11772-010-0050-7.

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AbstractThe progress in nanofabrication has made possible the realization of optic nanodevices able to handle single photons and to exploit the quantum nature of single-photon states. In particular, quantum cryptography (or more precisely quantum key distribution, QKD) allows unconditionally secure exchange of cryptographic keys by the transmission of optical pulses each containing no more than one photon. Additionally, the coherent control of excitonic and photonic qubits is a major step forward in the field of solid-state cavity quantum electrodynamics, with potential applications in quantum

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24

Tandon, Shruti, and R. I. Sujith. "Multilayer network analysis to study complex inter-subsystem interactions in a turbulent thermoacoustic system." Journal of Fluid Mechanics 966 (June 27, 2023). http://dx.doi.org/10.1017/jfm.2023.338.

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Thermoacoustic systems are complex systems where the interactions between the hydrodynamic, acoustic and heat release rate fluctuations lead to diverse dynamics such as chaos, intermittency and ordered dynamics. Such complex interactions cause catastrophically high-amplitude acoustic pressure oscillations and the emergence of order in the spatiotemporal dynamics, referred to as thermoacoustic instability. In this work, we use multilayer networks to study the spatial pattern of inter-subsystem interactions between the vorticity dynamics and thermoacoustic power generated due to acoustically cou

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25

Rodriguez, Mario George. "“Long Gone Hippies in the Desert”: Counterculture and “Radical Self-Reliance” at Burning Man." M/C Journal 17, no. 6 (2014). http://dx.doi.org/10.5204/mcj.909.

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Introduction Burning Man (BM) is a festival of art and music that materialises for one week each year in the Nevada desert. It is considered by many to be the world’s largest countercultural event. But what is BM, really? With record attendance of 69,613 in 2013 (Griffith) (the original event in 1986 had twenty), and recent event themes that have engaged with mainstream political themes such as “Green Man” (2007) and “American Dream” (2008), can BM still be considered countercultural? Was it ever? In the first part of this article, we define counterculture as a subculture that originates in th

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26

Wallace, Derek. "'Self' and the Problem of Consciousness." M/C Journal 5, no. 5 (2002). http://dx.doi.org/10.5204/mcj.1989.

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Whichever way you look at it, self is bound up with consciousness, so it seems useful to review some of the more significant existing conceptions of this relationship. A claim by Mikhail Bakhtin can serve as an anchoring point for this discussion. He firmly predicates the formation of self not just on the existence of an individual consciousness, but on what might be called a double or social (or dialogic) consciousness. Summarising his argument, Pam Morris writes: 'A single consciousness could not generate a sense of its self; only the awareness of another consciousness outside the self can p

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27

Leaver, Tama. "The Social Media Contradiction: Data Mining and Digital Death." M/C Journal 16, no. 2 (2013). http://dx.doi.org/10.5204/mcj.625.

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Introduction Many social media tools and services are free to use. This fact often leads users to the mistaken presumption that the associated data generated whilst utilising these tools and services is without value. Users often focus on the social and presumed ephemeral nature of communication – imagining something that happens but then has no further record or value, akin to a telephone call – while corporations behind these tools tend to focus on the media side, the lasting value of these traces which can be combined, mined and analysed for new insight and revenue generation. This paper se

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Michael, Rose. "Out of Time: Time-Travel Tropes Write (through) Climate Change." M/C Journal 22, no. 6 (2019). http://dx.doi.org/10.5204/mcj.1603.

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“What is the point of stories in such a moment”, asks author and critic James Bradley, writing about climate extinction: Bradley emphasises that “climatologist James Hansen once said being a climate scientist was like screaming at people from behind a soundproof glass wall; being a writer concerned with these questions often feels frighteningly similar” (“Writing”). If the impact of climate change asks humans to think differently, to imagine differently, then surely writing—and reading—must change too? According to writer and geographer Samuel Miller-McDonald, “if you’re a writer, then you hav

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Lawson, Jenny. "Food Confessions: Disclosing the Self through the Performance of Food." M/C Journal 12, no. 5 (2009). http://dx.doi.org/10.5204/mcj.199.

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At the end of the episode “Crowd Pleasers,” from her television series Nigella Feasts, we see British food writer and television cook Nigella Lawson in her nightgown opening her fridge in the dark. The fridge light reveals the remnant dishes of chili con carne that she prepared earlier on in the programme. She scoops up a dollop of soured cream and chili onto a spoon and shovels it into her mouth, nods approvingly and then picks up the entire chili dish. She eats another mouthful, utters a satisfied “umm” sound, closes the fridge door and walks away, taking the dish of chili with her. This rec

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Nairn, Angelique. "Chasing Dreams, Finding Nightmares: Exploring the Creative Limits of the Music Career." M/C Journal 23, no. 1 (2020). http://dx.doi.org/10.5204/mcj.1624.

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In the 2019 documentary Chasing Happiness, recording artist/musician Joe Jonas tells audiences that the band was “living the dream”. Similarly, in the 2012 documentary Artifact, lead singer Jared Leto remarks that at the height of Thirty Seconds to Mars’s success, they “were living the dream”. However, for both the Jonas Brothers and Thirty Seconds to Mars, their experiences of the music industry (much like other commercially successful recording artists) soon transformed into nightmares. Similar to other commercially successful recording artists, the Jonas Brothers and Thirty Seconds to Mars,

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