Anomalous exciton transport in response to a uniform, in-plane electric field

Abstract

Excitons are neutral objects, that, naively, should have no response to a uniform, electric field. Could the Berry curvature of the underlying electronic bands alter this conclusion? In this work, we show that Berry curvature can indeed lead to anomalous transport for excitons in 2D materials subject to a uniform, in-plane electric field. By considering the constituent electron and hole dynamics, we demonstrate that there exists a regime for which the corresponding anomalous velocities are in the same direction. We establish the resulting center of mass motion of the exciton through both a semiclassical and fully quantum mechanical analysis, and elucidate the critical role of Bloch oscillations in achieving this effect. We identify transition metal dichalcogenide heterobilayers as candidate materials to observe the effect.

9+9 pages, 6+6 figures. Comments welcome!

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Cited by in corpus (4)

• Semiclassical equations of motion for disordered conductors: extrinsic interband velocity, corrected collision integral and spin-orbit torques
• Inheritance of the exciton geometric structure from Bloch electrons in two-dimensional layered semiconductors
• Many-Body Quantum Geometric Dipole
• Topologically-enhanced exciton transport