Magnetophotoluminescence of exciton Rydberg states in monolayer<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>WS</mml:mi><mml:msub><mml:mi mathvariant="normal">e</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Liu, Erfu; Baren, Jeremiah van; Taniguchi, Takashi; Watanabe, Kenji; Chang, Yia-Chung; Lui, Chun Hung

doi:10.1103/physrevb.99.205420

Cited by 60 publications

(49 citation statements)

References 53 publications

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“…It needs to be checked if it is the case for the dark exciton in MoS2 as well. Finally, phonon replicas of dark excitons, for instance in Figure 9 are observed energetically below the dark excitons in monolayer WS2 and WSe2 on the basis of their observed g factors (either about 9 or 12), energetic locations, and valley polarization 177,179,180,209 . Therefore, magnetooptical spectroscopy has been crucial in the identification of PL peaks previously under debate 87,166,203 .…”

Section: Neutral 'Dark' Excitons In Tmdcsmentioning

confidence: 95%

“…Δ is of the order of few meVs to a few 10s of meVs, while Δ ranges from about 150 meV to 500 meV [162][163][164][165] . Due to the specific sign of the conductionband splitting, the ground-state exciton in WS2, WSe2, and MoS2 is found to be optically "spin forbidden" or "dark" 87,162,[172][173][174][175][176][177][178][179][180][181]164,182,[165][166][167][168][169][170][171] (see Figure 2(b)). In MoSe2 and MoTe2, however, the ground-state exciton is an optically "bright" state due to a reversed conduction band splitting compared to the other three materials 165,[182][183][184][185] (Figure 2(b)).…”

Section: Zeeman Splittingmentioning

confidence: 99%

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Magneto-optics of layered two-dimensional semiconductors and heterostructures: Progress and prospects

Arora

2021

Journal of Applied Physics

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Beginning with the 'conventional' two-dimensional (2D) quantum wells (QWs) based on III-V and II-VI semiconductors in the 1970s, to the recent atomically-thin sheets of van der Waals materials such as 2D semiconducting transition metal dichalcogenides (TMDCs) and 2D magnets, the research in 2D materials is continuously evolving and providing new challenges. Magnetooptical spectroscopy has played a significant role in this area of research, both from fundamental physics and technological perspectives. A major challenge in 2D semiconductors such as TMDCs is to understand their spin-valley-resolved physics, and their implications in quantum computation and information research. Since the discovery of valley Zeeman effects, deep insights into the spin-valley physics of TMDCs and their heterostructures has emerged through magnetooptical spectroscopy. In this perspective, we highlight the role of magnetooptics in many milestones such as the discovery of interlayer excitons, phase control between coherently-excited valleys, determination of exciton-reduced masses, Bohr radii and binding energies, physics of the optically-bright and dark excitons, trions, other many-body species such as biexcitons and their phonon replicas in TMDC monolayers. The discussion accompanies open questions, challenges and future prospects in the field including comments on the magnetooptics of van der Waals heterostructures involving TMDCs and 2D magnets.

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Section: Neutral 'Dark' Excitons In Tmdcsmentioning

confidence: 95%

Section: Zeeman Splittingmentioning

confidence: 99%

Magneto-optics of layered two-dimensional semiconductors and heterostructures: Progress and prospects

Arora

2021

Journal of Applied Physics

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“…Electron-and exciton-phonon interaction results in pronounced sidebands in absorption and emission spectra, [5,6] controls resonant light scattering and impacts coherence generation. [7][8][9][10] The electron-phonon interaction serves as an efficient channel of the momentum and energy relaxation of charge carriers and excitons. [11][12][13] In general, polaron effects related to the coupling of the charge carriers with in-plane polarized phonons are important for the physics of TMDC monolayers.…”

Section: Introductionmentioning

confidence: 99%

Interlayer Exciton–Polaron in Atomically Thin Semiconductors

2020

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A novel type of exciton-phonon bound state-interlayer polaron-in a double-layer 2D semiconductor with transition metal dichalcogenides as an example, is predicted. In these systems, the interaction of the interlayer exciton with the soft modes of out-of-plane lattice vibrations caused by van der Waals forces and flexural rigidity gives rise to a bound quasiparticle. The energy and effective mass of the formed polaron for weak and strong exciton-phonon coupling regimes are calculated and analyzed. Possible manifestations of these effects in transport-and spectroscopy-related experiments are discussed.

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“…They have direct band gap at two time-reversal valleys (K, K') [2,3], where spin-orbit coupling (SOC) splits each band into two subbands with opposite spins [4][5][6]. The electrons and holes can form tightly bound excitons at each valley [7][8][9][10][11][12][13][14]. If they come from bands with the same electron spin, they form bright excitons with efficient radiative recombination [ Fig.…”

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confidence: 99%

Valley-selective chiral phonon replicas of dark excitons and trions in monolayer WSe2

Liu

Baren

Taniguchi

et al. 2019

Phys. Rev. Research

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Monolayer WSe2 hosts long-lived dark excitonic states with robust valley polarization, but thus far lacks an experimental signature to identify their valley pseudospin. Here we reveal a set of three replica luminescent peaks at ~21.4 meV below the dark exciton, negative and positive dark exciton-polarons (or trions) in monolayer WSe2. The redshift energy matches the energy of the zone-center E" chiral phonons. The replicas exhibit parallel gate dependence and the same g-factors as the dark excitonic states, but follow the valley selection rules of bright excitonic states. While the dark states exhibit out-of-plane transition dipole and linearly polarized emission in the in-plane directions, their phonon replicas exhibit in-plane transition dipole and circularly polarized emission in the out-ofplane directions. Symmetry analysis shows that the K-valley dark exciton decays into a left-handed chiral phonon and a right-handed photon, whereas the K'-valley dark exciton decays into a right-handed phonon and a left-handed photon. Such chiral-phonon replicas can help identify the dark-state valley pseudospin and explore the intriguing excitonphonon interactions in monolayer WSe2.

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Magnetophotoluminescence of exciton Rydberg states in monolayerWSe2

Cited by 60 publications

References 53 publications

Magneto-optics of layered two-dimensional semiconductors and heterostructures: Progress and prospects

Magneto-optics of layered two-dimensional semiconductors and heterostructures: Progress and prospects

Interlayer Exciton–Polaron in Atomically Thin Semiconductors

Valley-selective chiral phonon replicas of dark excitons and trions in monolayer WSe2

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