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Broken symmetries associated with a Kagome chiral charge order

Journal Article · · Nature Communications
 [1];  [1];  [1];  [2];  [3];  [2];  [2];  [1];  [1];  [1];  [3];  [1];  [1];  [1];  [4];  [3];  [5];  [3];  [2];  [1]
  1. Princeton University, NJ (United States)
  2. Nanyang Technological University (Singapore)
  3. Beijing Institute of Technology (China); Beijing Institute of Technology, Zhuhai (China)
  4. Johns Hopkins University, Baltimore, MD (United States)
  5. National High Magnetic Field Laboratory, Tallahassee, FL (United States); Florida State University, Tallahassee, FL (United States)
+ Show Author Affiliations
Chirality, or handedness, is ubiquitous in science, from cell biology to physics, and in condensed matter can underlie exotic phases such as chiral charge density waves and chiral superconductivity. However, detecting subtle broken symmetries that define such states is challenging, leading to debate and controversy. Here, using second-order optical response, we reveal the broken symmetries of a chiral charge density wave in the Kagome lattice KV3Sb5. Polarization-dependent mid-infrared photocurrent microscopy uncovers a longitudinal, helicity-dependent photocurrent associated with the charge order, indicating broken inversion and mirror symmetries. These findings, supported by theoretical analysis, directly establish the intrinsic chiral nature of the ordered state. Moreover, the absence of a circular photogalvanic effect perpendicular to the incident light imposes stringent constraints on the point-group symmetries. Our study not only visualizes the chiral nature of the Kagome charge order, but also highlights the nonlinear photogalvanic effect as a sensitive probe for detecting subtle symmetry breakings.
Research Organization:
Florida State University, Tallahassee, FL (United States)
Sponsoring Organization:
Agency for Science, Technology and Research (A*STAR); National Key Research and Development Program of China; National Research Foundation; National Science Foundation; National Science Foundation of China; Singapore Ministry of Education (MOE); Singapore Ministry of Education (MOE) Academic Research Fund; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-05ER46200; SC0002613
OSTI ID:
2574359
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 16; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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