Intervalley Polaron in Atomically Thin Transition Metal Dichalcogenides

Abstract

We study theoretically intervalley coupling in transition-metal dichalcogenide monolayers due to electron interaction with short-wavelength phonons. We demonstrate that this intervalley polaron coupling results in (i) a renormalization of the conduction band spin splitting and (ii) an increase of the electron effective masses. We also calculate the renormalization of the cyclotron energy and the Landau level splitting in the presence of an external magnetic field. An inter-valley magneto-phonon resonance is uncovered. Similar, but much weaker effects are also expected for the valence band holes. These results might help to resolve the discrepancy between ab initio values of the electron effective masses and the ones deduced from magneto-transport measurements.

arXiv comment7 pages, 3 figures + supplement 4 pages

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Cited by in corpus (7)

• Revealing exciton masses and dielectric properties of monolayer semiconductors with high magnetic fields
• Measurement of Conduction and Valence Bands g-factors in a Transition Metal Dichalcogenide Monolayer
• Quantum interference effect on exciton transport in monolayer semiconductors
• Quenching of Intervalley Exchange Coupling in the Presence of Momentum-Dark States in TMDCs
• Interlayer exciton-polaron in atomically thin semiconductors
• Fine structure of negatively charged and neutral excitons in monolayer MoS${}_2$
• Boltzmann transport theory of magnon-exciton drag