Volume 132, Number 3, November 2020
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||29 December 2020|
Hall effect for Dirac electrons in graphene exposed to an Abrikosov flux lattice
1 Department of Physics, 104 Davey Lab, The Pennsylvania State University - University Park, PA 16802, USA
2 Department of Physics, Indian Institute of Science - Bangalore 560012, India
3 Tata Institute of Fundamental Research - Homi Bhabha Road, Colaba, Mumbai 400 005, India
4 National Institute for Materials Science - Namiki 1-1, Ibaraki 305-0044, Japan
Received: 7 October 2020
Accepted: 20 October 2020
The proposals for realizing exotic particles through coupling of quantum Hall effect to superconductivity involve spatially non-uniform magnetic fields. As a step toward that goal, we study, both theoretically and experimentally, a system of Dirac electrons exposed to an Abrikosov flux lattice. We theoretically find that the non-uniform magnetic field causes a carrier-density–dependent reduction of the Hall conductivity. Our studies show that this reduction originates from a rather subtle effect: a levitation of the Berry curvature within Landau levels broadened by the non-uniform magnetic field. Experimentally, we measure the magneto-transport in a monolayer graphene-hexagonal boron nitride-niobium diselenide (NbSe2) heterostructure, and find a density-dependent reduction of the Hall resistivity of graphene as the temperature is lowered from above the superconducting critical temperature of NbSe2, when the magnetic field is uniform, to below, where the magnetic field bunches into an Abrikosov flux lattice.
PACS: 72.80.Vp – Electronic transport in graphene
© 2020 EPLA
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.