Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session Q65: Quantum Hall Effect: Transport Phenomena
3:00 PM–5:48 PM,
Wednesday, March 16, 2022
Room: Hyatt Regency Hotel -Grant Park C
Sponsoring
Unit:
DCMP
Chair: Frederic Joucken, Arizona State University
Abstract: Q65.00008 : Bias controlled switching of spin polarization between ν = ±1 quantum Hall edges at graphene pn junction
4:24 PM–4:36 PM
Presenter:
Arup K Paul
(Indian Institute of Science Bangalore)
Authors:
Arup K Paul
(Indian Institute of Science Bangalore)
Manas R Sahu
(Indian Institute of Science Bangalore)
Kenji Watanabe
(2National Institute for Materials Science, Namiki 1-1, Ibaraki 305-0044, Japan.)
Takashi Taniguchi
(2National Institute for Materials Science, Namiki 1-1, Ibaraki 305-0044, Japan.)
Jainendra K Jain
(Pennsylvania State University)
Ganpathy N Murthy
(University of Kentucky)
Anindya Das
(Indian institute of science, Bangalore)
understand their low-energy excitations. One promising route for this is to study the effects of different
ground states of ν = 0 filling on nearby edge states belonging to fillings |ν| > 0. In this regard, graphene
pn junction is an ideal platform, as in the symmetry broken quantum Hall (QH) regime, the co-propagating
electron and hole-like edge states at the junction are separated by a narrow ν = 0 region. Here, we report
bias controlled tunneling between ν = ±1 QH edges in a graphite gated hBN encapsulated monolayer
graphene device. At zero bias, we observe finite tunneling (t ∼ 0.5), which remains almost constant up
to ∼ 120μV at 8T. Strikingly, above ∼ 120μV the tunnelling sharply falls and exhibits repeated smaller
peaks at discrete energies before vanishing completely. Moreover, the tunneling shows unique dependence
on filling, magnetic field and temperature. The tunneling at zero bias is anomalous as it is is expected to
be zero between ν = ±1 edges due to their orthogonal spin polarization. Thus, from tunneling to fully
blockade suggests bias-controlled switching of spin polarization between ν = ±1 edges, which is further
corroborated with our detailed theoretical calculations.
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