Quantum Geometric Oscillations in Two-Dimensional Flat-Band Solids
arXiv:2212.12852 · doi:10.1103/PhysRevLett.130.266601
Abstract
Two-dimensional van der Waals heterostructures can be engineered into artificial superlattices that host flat bands with significant Berry curvature and provide a favorable environment for the emergence of novel electron dynamics. In particular, the Berry curvature can induce an oscillating trajectory of an electron wave packet transverse to an applied static electric field. Though analogous to Bloch oscillations, this novel oscillatory behavior is driven entirely by quantum geometry in momentum space instead of band dispersion. While the orbits of Bloch oscillations can be localized by increasing field strength, the size of the geometric orbits saturates to a nonzero plateau in the strong-field limit. In non-magnetic materials, the geometric oscillations are even under inversion of the applied field, whereas the Bloch oscillations are odd, a property that can be used to distinguish these two co-existing effects.
arXiv comment6 + 7 pages, 2 figures. Comments are greatly appreciated!
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Cited by in corpus (6)
- Berry Curvature Spectroscopy from Bloch Oscillations
- Roses in the Nonperturbative Current Response of Artificial Crystals
- Floquet-Bloch Theory for Nonperturbative Response to a Static Drive
- Symmetry-enforced double Weyl points, multiband quantum geometry, and singular flat bands of doping-induced states at the Fermi level
- Quantum Metric-induced Oscillations in Flat Bands
- Optical Absorption and Emission from Wannier-Stark Spectra of Moiré Superlattices