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Title: Strain-fluctuation-induced near quantization of valley Hall conductivity in graphene systems

Journal Article · · Physical Review. B
 [1];  [2]
  1. Guangzhou Univ. (China); Carnegie Mellon Univ., Pittsburgh, PA (United States)
  2. Carnegie Mellon Univ., Pittsburgh, PA (United States)

We develop a theory of the valley Hall effect in high-quality graphene samples, in which strain-fluctuation-induced random gauge potentials have been suggested as the dominant source of disorder. We find a near-quantized value of valley Hall conductivity in the band transport regime, which originates from an enhanced side jump of a Dirac electron when it scatters off the gauge potential. By assuming a small residue charge density our theory reproduces qualitatively the temperature and gap dependence of the observed valley Hall effect at the charge neutral point. Furthermore, our study suggests that the valley Hall effect in graphene systems represents a new paradigm for the anomalous Hall physics where gauge disorder plays an important role.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Programmable Quantum Materials (Pro-QM); Columbia Univ., New York, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0019443; Pro-QM EFRC (DE-SC0019443)
OSTI ID:
1613235
Alternate ID(s):
OSTI ID: 1512548
Journal Information:
Physical Review. B, Vol. 99, Issue 20; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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