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Title: Nonreciprocal Directional Dichroism Induced by the Quantum Metric Dipole

Journal Article · · Physical Review Letters
 [1];  [1]
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States)

We identify the quantum metric dipole as the geometric origin of the nonreciprocal directional dichroism which describes the change in the refractive index upon reversing the light propagation direction. Specifically, we find that the static limit of the nonreciprocal directional dichroism corresponds to a quadrupolar transport current from the quantum metric dipole, in response to a quadrupolar electric field. Moreover, at a finite frequency, we demonstrate that the steepest slope of the averaged quantum metric dipole gives rise to a peak in the differential refractive index between counterpropagating lights. Lastly, we illustrate both features in a low-energy model.

Research Organization:
Univ. of Washington, Seattle, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012509
OSTI ID:
1611832
Alternate ID(s):
OSTI ID: 1546399
Journal Information:
Physical Review Letters, Vol. 122, Issue 22; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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