Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session X51: Transport in Graphene Systems
11:15 AM–2:15 PM,
Friday, March 6, 2020
Room: Mile High Ballroom 1D
Sponsoring
Unit:
DCMP
Chair: Gregory Stephen, Laboratory for Physical Sciences
Abstract: X51.00003 : Nonlocal transport in twisted double bilayer graphene*
Presenter:
Subhajit Sinha
(Tata Institute of Fundamental Research (TIFR))
Authors:
Subhajit Sinha
(Tata Institute of Fundamental Research (TIFR))
Pratap Adak
(Tata Institute of Fundamental Research (TIFR))
Surya Kanthi R. S.
(Tata Institute of Fundamental Research (TIFR))
L. D. Varma Sangani
(Tata Institute of Fundamental Research (TIFR))
Kenji Watanabe
(National Institute for Materials Science, Tsukuba)
Takashi Taniguchi
(National Institute for Materials Science, Tsukuba)
Mandar M Deshmukh
(Tata Institute of Fundamental Research (TIFR))
We integrate both these ways of valley current generation and implement it on dual gated twisted double bilayer graphene device, where the two copies of bilayer graphene have been rotated by 1.18o. We observe large non-local resistance few microns away from local probes. We further demonstrate its tunability with electric field and with charge density.
One can thus explore this additional valley degree of freedom to transmit information coherently over distances of few microns in graphene. This may open up new avenues in the emerging field of valleytronics.
*We acknowledge funding from Department of Atomic Energy, India and Department of Science and Technology, India.
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