Berry Curvature Spectroscopy from Bloch Oscillations
arXiv:2305.14532 · doi:10.1103/PhysRevLett.131.196603
Abstract
Artificial crystals such as moiré superlattices can have a real-space periodicity much larger than the underlying atomic scale. This facilitates the presence of Bloch oscillations in the presence of a static electric field. We demonstrate that the optical response of such a system, when dressed with a static field, becomes resonant at the frequencies of Bloch oscillations, which are in the terahertz regime when the lattice constant is of the order of 10 nm. In particular, we show within a semiclassical band-projected theory that resonances in the dressed Hall conductivity are proportional to the lattice Fourier components of the Berry curvature. We illustrate our results with a low-energy model on an effective honeycomb lattice.
arXiv comment6 + 4 pages, 3 figures. Published version
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- Quantum Metric-induced Oscillations in Flat Bands
- Universal intrinsic orbital dynamics from Berry curvature in electronic two-band systems
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- Spin-polarized scanning tunneling microscopy measurement scheme for determining the quantum geometric tensor
- Probing the Quantum Geometry of Correlated Metals using Optical Conductivity