Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session D52: Surface Studies of 2D Materials
2:30 PM–5:06 PM,
Monday, March 2, 2020
Room: Mile High Ballroom 1E
Sponsoring
Unit:
DCMP
Chair: Kristen Burson, Hamilton College
Abstract: D52.00007 : Topological charge pumping in twisted bilayer graphene*
Presenter:
Yinhan Zhang
(Carnegie Mellon Univ)
Authors:
Yinhan Zhang
(Carnegie Mellon Univ)
Yang Gao
(Carnegie Mellon Univ)
Di Xiao
(Carnegie Mellon Univ)
We show that a sliding motion between the two layers of a \moire 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 \moire superlattices, and may find applications in nanogenerators and nanomotors.
*Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division, Pro-QM EFRC (DE-SC0019443).
Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division (DE-SC0012509).
Simons Foundation Fellowship in Theoretical Physics
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