期刊
PHYSICAL REVIEW LETTERS
卷 124, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.077401
关键词
-
资金
- Department of Energy, Basic Energy Sciences [DE-SC0012509]
- Simons Foundation Fellowship in Theoretical Physics
- Department of Energy, Basic Energy Sciences, Pro-QM EFRC [DE-SC0019443]
We develop a general theory of the layer circular photogalvanic effect (LCPGE) in quasi-two-dimensional chiral bilayers, which refers to the appearance of a polarization-dependent, out-of-plane static dipole moment induced by circularly polarized light. We elucidate the geometric origin of the LCPGE as two types of interlayer coordinate shift weighted by the quantum metric tensor and the Berry curvature, respectively. As a concrete example, we calculate the LCPGE in twisted bilayer graphene, and find that it exhibits a resonance peak whose frequency can be tuned from visible to infrared as the twisting angle varies. The LCPGE thus provides a promising route toward frequency-sensitive, circularly polarized light detection, particularly in the infrared range.
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