Article
Physics, Multidisciplinary
Di Huang, Kevin Sampson, Yue Ni, Zhida Liu, Danfu Liang, Kenji Watanabe, Takashi Taniguchi, Hebin Li, Eric Martin, Jesper Levinsen, Meera M. Parish, Emanuel Tutuc, Dmitry K. Efimkin, Xiaoqin Li
Summary: When mobile impurities are introduced and coupled to a Fermi sea, new quasiparticles called Fermi polarons are formed. There are two regimes of the Fermi polaron problem: attractive polarons (AP) connected to pairing phenomena, and repulsive polarons (RP) responsible for ferromagnetism. In this study, we investigate Fermi polarons in a doped MoSe2 monolayer and find agreement with polaron theory for attractive polarons. The dynamics of Fermi polarons are important for understanding pairing and magnetic instabilities in various physical systems.
Article
Optics
R. R. Akhmadullin, N. V. Kozyrev, B. R. Namozov, Yu. G. Kusrayev, G. Karczewski, T. Wojtowicz
Summary: This paper investigates the energy and spin relaxation of excitons and trions in (Cd, Mn)Te/(Cd, Mg)Te quantum wells containing hole magnetic polarons using polarized photoluminescence technique. The results show that the photoluminescence is polarized under circularly polarized photoexcitation, indicating the presence of spin memory in these systems. It is suggested that the long spin memory is due to the formation of magnetic polarons stabilizing the spin of excitons. Additionally, an inverted sign of circular polarization degree is observed in the radiation spectrum under quasiresonant excitation of trion states, indicating a special spin relaxation mechanism. The application of an external magnetic field leads to depolarization of excitonic radiation, caused by destabilization of magnetic polarons and shortened spin relaxation time of excitons.
JOURNAL OF LUMINESCENCE
(2023)
Article
Multidisciplinary Sciences
Ke Wei, Qirui Liu, Yuxiang Tang, Yingqian Ye, Zhongjie Xu, Tian Jiang
Summary: Controlling light-matter interaction at micro- and nano-scale is important for modern optics and optoelectronics. The study explores a new cooperative coupling between plasmon and different excitonic complexes in WS2-silver nanocavities, resulting in the creation of plasmon-excitontrion-charged biexciton four coupling states. The demonstration of the charged biexciton polariton showcases high nonlinearity and potential for energy-efficient optical switching and information processing.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Abderrezak Torche, Gabriel Bester
Summary: Transition metal dichalcogenides monolayers can host strongly bounded Coulomb complexes like excitons and trions, with biexcitons having a binding energy one order of magnitude higher than conventional semiconductors. Using first principles methods, researchers have investigated biexcitons in WSe2 monolayers and highlighted the crucial role of the electron-hole exchange interaction in determining the valley characteristics of the biexciton states.
COMMUNICATIONS PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Jonas Zipfel, Koloman Wagner, Marina A. Semina, Jonas D. Ziegler, Takashi Taniguchi, Kenji Watanabe, Mikhail M. Glazov, Alexey Chernikov
Summary: In this study, we experimentally and theoretically investigate the electron recoil effect in the interaction of excitons with free charge carriers. We use time-resolved analysis of recoil line shapes to explore the nonequilibrium states of exciton-carrier complexes and reveal the cooling process of the carriers and its influencing factors. Additionally, by comparing recoil analysis with luminescence rise times, we gain further insight into trion dynamics.
Article
Materials Science, Multidisciplinary
D. Beret, L. Ren, C. Robert, L. Foussat, P. Renucci, D. Lagarde, A. Balocchi, T. Amand, B. Urbaszek, K. Watanabe, T. Taniguchi, X. Marie, L. Lombez
Summary: We investigated the diffusion process of negatively charged excitons in a WSe2 monolayer and found nonlinear diffusion behavior. The dynamics of different excitonic species were examined, and a bimolecular formation mechanism was proposed. Based on our experimental observations, a phenomenological model suggesting the coexistence of two populations, with different diffusion mechanisms, was proposed.
Article
Chemistry, Multidisciplinary
Jonas D. D. Ziegler, Yeongsu Cho, Sophia Terres, Matan Menahem, Takashi Taniguchi, Kenji Watanabe, Omer Yaffe, Timothy C. C. Berkelbach, Alexey Chernikov
Summary: 2D hybrid perovskites have attracted significant attention in material research for light-harvesting and -emitting applications. In this study, a method of interfacing ultrathin sheets of perovskites with few-layer graphene and hexagonal boron nitride is demonstrated, enabling gate-tunable control of light emission and absorption. The findings reveal the emergence of both negatively and positively charged excitons, with high binding energies and excellent mobility. This research introduces the physics of interacting mixtures of optical and electrical excitations to the broad family of 2D inorganic-organic nanostructures, highlighting the potential of 2D perovskites as a promising material platform for electrically modulated light-emitters and exciton transistors.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yaroslav Zhumagulov, Alexei Vagov, Dmitry R. Gulevich, Vasili Perebeinos
Summary: Charged excitons or trions play a crucial role in the optical spectra of low-dimensional doped monolayers of TMDC. By diagonalizing the three-body Hamiltonian, the study investigates the low-lying trion states in four types of TMDC monolayers and explores the influence of doping and dielectric environment on their fine structure.
Article
Multidisciplinary Sciences
Zhaojun Li, Hope Bretscher, Yunwei Zhang, Geraud Delport, James Xiao, Alpha Lee, Samuel D. Stranks, Akshay Rao
Summary: The use of cation donors has been demonstrated to significantly enhance the photoluminescence of monolayer transition metal disulfides, which is more effective than commonly used p-dopants. In addition, the ionic salts used in the treatments are environmentally friendly and easier to handle, providing the possibility of treatments during device fabrication.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Gabriele Riva, Timothee Audinet, Matthieu Vladaj, Pina Romaniello, J. Arjan Berger
Summary: This article presents an original strategy for calculating direct and inverse photoemission spectra from first principles. The main goal is to go beyond standard Green's function approaches and accurately describe both quasiparticles and satellite structures in strongly correlated materials. The authors use the three-body Green's function as a key quantity and demonstrate how to retrieve the one-body Green's function from it. They also find that satellite information is already present in the non-interacting three-body Green's function and that simple approximations to the three-body self-energy can yield accurate spectral functions.
Article
Materials Science, Multidisciplinary
Santu K. Bera, Megha Shrivastava, Khamari Bramhachari, Hanyu Zhang, Ajay K. Poonia, Dipendranath Mandal, E. M. Miller, Matthew C. Beard, Amit Agarwal, K. Adarsh
Summary: By manipulating the dielectric environment, Coulomb interactions in atomically thin transition metal dichalcogenides can be dynamically engineered to achieve a giant band-gap renormalization and complete suppression of exciton absorption. The observed results demonstrate photoinduced transparency and layer-dependent optical tuning of exciton lifetime, which may be reversible.
Article
Chemistry, Physical
Nicholas Hight-Huf, James Nicolas Pagaduan, Reika Katsumata, Todd Emrick, Michael D. Barnes
Summary: This study demonstrates the important interplay between electron exchange and electrostatic interactions at the interface between polymers and transition metal dichalcogenides (TMDCs), which is crucial for controlling fundamental electronic properties relevant to next-generation devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Physics, Multidisciplinary
Joel Priestley, Gerard Valenti-Rojas, Ewan M. Wright, Patrik Ohberg
Summary: We investigated the properties of two quantum particles confined in a ring, where their interaction is described by a long-range gauge potential proportional to their distance. Our findings show that under strong interaction, the ground state of the two particles has a non-zero angular momentum. Additionally, we observed that the particles are correlated in terms of being close together or separated on the ring depending on the interaction strength. Furthermore, we examined the effect of measuring one particle's position and removing it from the ring, demonstrating that the remaining particle can be prepared in a non-dispersive state with non-zero angular momentum.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Physics, Condensed Matter
V. M. Kovalev, M. Boev, O. Kibis
Summary: Using the Floquet theory, this study developed a method to control the excitonic properties of semiconductor quantum wells through a high-frequency electromagnetic field. It was found that the field induced a blue shift in the exciton emission and narrowed the corresponding spectral line width. This finding has important implications for tuning the characteristics of optoelectronic devices based on quantum wells.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Multidisciplinary Sciences
Jack B. Muir, Jesper Levinsen, Stuart K. Earl, Mitchell A. Conway, Jared H. Cole, Matthias Wurdack, Rishabh Mishra, David J. Ing, Eliezer Estrecho, Yuerui Lu, Dmitry K. Efimkin, Jonathan O. Tollerud, Elena A. Ostrovskaya, Meera M. Parish, Jeffrey A. Davis
Summary: Researchers introduced mobile exciton impurities into a two-dimensional electron gas and conducted experiments on monolayer WS2 using multi-dimensional coherent spectroscopy. They found that at low electron doping densities, the dominant interactions occur between polaron states dressed by the same Fermi sea. Additionally, they discovered a bipolaron bound state with remarkably large binding energy involving excitons in different valleys cooperatively bound to the same electron.
NATURE COMMUNICATIONS
(2022)
