Topological charge pumping in twisted bilayer graphene

Zhang, Yinhan; Gao, Yang; Xiao, Di

doi:10.1103/physrevb.101.041410

Topological charge pumping in twisted bilayer graphene

Journal Article · Tue Jan 28 00:00:00 EST 2020 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.101.041410· OSTI ID:1803826

^[1]; Gao, Yang ^[2]; ^[2]

Carnegie Mellon Univ., Pittsburgh, PA (United States); OSTI
Carnegie Mellon Univ., Pittsburgh, PA (United States)

In this work, we show that a sliding motion between the two layers of a moiré superlattice induces an electric current and realizes a two-dimensional version of the topological Thouless pump when the Fermi energy lies in one of the minigaps. Interestingly, a chiral charge pump, namely, a transverse current induced by the sliding motion, is possible in twisted homobilayers. This result is confirmed by a concrete calculation of the adiabatic current in twisted bilayer graphene. Our work reveals an interesting link between mechanical motion and electricity unique to moiré superlattices, and may find applications in nanogenerators and nanomotors.

View Accepted Manuscript (DOE)

Research Organization:: Columbia Univ., New York, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Programmable Quantum Materials (Pro-QM)

Sponsoring Organization:: Simons Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0019443

OSTI ID:: 1803826

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 4 Vol. 101; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

Topological charge pumping by a sliding moiré pattern Fujimoto, Manato; Koschke, Henri; Koshino, Mikito Physical Review B, Vol. 101, Issue 4 https://doi.org/10.1103/physrevb.101.041112	journal	January 2020
Topological sliding moiré heterostructure Su, Ying; Lin, Shi-Zeng Physical Review B, Vol. 101, Issue 4 https://doi.org/10.1103/physrevb.101.041113	journal	January 2020

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