Exciton-polarons in the presence of strongly correlated electronic states in a MoSe$_2$/WSe$_2$ moiré superlattice

Campbell, Aidan; Brotons‐Gisbert, Mauro; Baek, Hong Sun; Vitale, Valerio; Taniguchi, Takashi; Watanabe, Kenji; Lischner, Johannes; Gerardot, Brian D.

doi:10.48550/arxiv.2202.08879

Cited by 3 publications

(3 citation statements)

References 41 publications

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“…( 4) and ( 5), provides a good platform for the analysis of the quantum transport phenomena in an electron gas under resonance conditions by EPI. Finally, the existence of flat band in the twisted 2D TMDs 36,47 allows for the investigation of strongly correlated electronic states, in particular, the influence of the MP resonances regime on filling factors.…”

Section: Conclussionsmentioning

confidence: 99%

“…The MP processes, due to electron-LO Pekar-Fröhlich (PF) interaction, have been reported for ML of MoS 2 and WS 2 35 . The behavior of the exciton-polaron magnetic interaction with correlated electronic states in a moiré WSe 2 superlattice has been recently unveiled 36 . In particular, the presence of the B field makes it possible the observe attractive and repulsive WSe 2 exciton-polarons due to the coupling with charge carriers in a moiré WSe 2 superlattice.…”

Section: Introductionmentioning

confidence: 99%

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New magneto-polaron resonances in a monolayer of a transition metal dichalcogenide

Trallero‐Giner

Santiago-Pérez

Fomin

2022

Preprint

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Transition metal dichalcogenide (TMD) semiconductors are two-dimensional materials with great potential for the future of nano-optics and nano-optoelectronics as well as the rich and exciting development of basic research. The influence of an external magnetic field on a TMD monolayer raises a new question: to unveil the behavior of the magneto-polaron resonances (MPRs) associated with the phonon symmetry inherent in the system.It is shown that the renormalized Landau energy levels are modified by the interplay of the long-range Pekar-Fröhlich (PF) and short-range deformation potential (DP) interactions. It leads to a new series of MPRs involving the optical phonons at the center of the Brillouin zone. The coupling of the two Landau levels with the LO and A1 optical phonon modes provokes resonant splittings of double avoided-crossing levels giving rise to three excitation branches. This effect appears as bigger energy gaps at the anticrossing points in the renormalization Landau levels.To explore the interplay between the MPR, the electron-phonon interactions (PF and DP) and the couplings between adjacent Landau levels, a full Green's function treatment for the evaluation of the energy and its life-time broadening is developed. A generalization of the two-level approach is performed for the description of the new MPR branches. The obtained results are a guideline for the magneto-optical experiments in TMDs, where three MPR peaks should be observable.

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Section: Conclussionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New magneto-polaron resonances in a monolayer of a transition metal dichalcogenide

Trallero‐Giner

Santiago-Pérez

Fomin

2022

Preprint

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“…The rise of long period moiré patterns, formed by vertically stacking two atomically thin crystals with a lattice mismatch (δ) and / or relative twist angle (θ), provides an unique capability to tune the two critical energy scales (Coulomb interaction and kinetic energies) -and the electron density -over several orders of magnitude, creating a highly versatile solid-state quantum material platform [1]. The potential to engineer and probe strongly correlated states has been highlighted in several moiré material systems, including twisted bilayer graphene heterostructures near the magic angle [2][3][4] and homo- [5][6][7] or hetero- [8][9][10][11] bilayer transition metal dichalcogenide (TMD) moiré heterostructures. The physics of these systems is determined by the strong electronic interactions in the landscape defined by the underlying moiré potentials.…”

Section: Introductionmentioning

confidence: 99%

Moiré straintronics: a universal platform for reconfigurable quantum materials

Kögl¹,

Soubelet²,

Brotons-Gisbert³

et al. 2022

Preprint

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Large scale two-dimensional (2D) moiré superlattices are driving a revolution in designer quantum materials. The electronic interactions in these superlattices, strongly dependent on the periodicity and symmetry of the moiré pattern, critically determine the emergent properties and phase diagrams. To date, the relative twist angle between two layers has been the primary tuning parameter for a given choice of constituent crystals. Here, we establish strain as a powerful mechanism to insitu modify the moiré periodicity and symmetry. We develop an analytically exact mathematical description for the moiré lattice under arbitrary in-plane heterostrain acting on any bilayer structure. We demonstrate the ability to fine-tune the moiré lattice near critical points, such as the magic angle in bilayer graphene, or fully reconfigure the moiré lattice symmetry beyond that imposed by the unstrained constituent crystals. Due to this unprecedented simultaneous control over the strength of electronic interactions and lattice symmetry, 2D heterostrain provides a powerful platform to engineer, tune, and probe strongly correlated moiré materials.

show abstract

New magneto-polaron resonances in a monolayer of a transition metal dichalcogenide

Trallero‐Giner

Santiago-Pérez

Fomin

2023

Sci Rep

View full text Add to dashboard Cite

Transition metal dichalcogenide (TMD) semiconductors are two-dimensional materials with great potential for the future of nano-optics and nano-optoelectronics as well as the rich and exciting development of basic research. The influence of an external magnetic field on a TMD monolayer raises a new question: to unveil the behavior of the magneto-polaron resonances (MPRs) associated with the phonon symmetry inherent in the system. It is shown that the renormalized Landau energy levels are modified by the interplay of the long-range Pekar–Fröhlich (PF) and short-range deformation potential (DP) interactions. This leads to a new series of MPRs involving the optical phonons at the center of the Brillouin zone. The coupling of the two Landau levels with the LO and $$A_1$$ A 1 optical phonon modes provokes resonant splittings of double avoided-crossing levels giving rise to three excitation branches. This effect appears as bigger energy gaps at the anticrossing points in the renormalized Landau levels. To explore the interplay between the MPRs, the electron-phonon interactions (PF and DP) and the couplings between adjacent Landau levels, a full Green’s function treatment for the evaluation of the energy and its life-time broadening is developed. A generalization of the two-level approach is performed for the description of the new MPR branches. The obtained results are a guideline for the magneto-optical experiments in TMDs, where three MPR peaks should be observable.

show abstract

Exciton-polarons in the presence of strongly correlated electronic states in a MoSe$_2$/WSe$_2$ moiré superlattice

Cited by 3 publications

References 41 publications

New magneto-polaron resonances in a monolayer of a transition metal dichalcogenide

New magneto-polaron resonances in a monolayer of a transition metal dichalcogenide

Moiré straintronics: a universal platform for reconfigurable quantum materials

New magneto-polaron resonances in a monolayer of a transition metal dichalcogenide

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