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Title: Edge-channel interferometer at the graphene quantum Hall pn junction

We demonstrate a quantum Hall edge-channel interferometer in a high-quality graphene pn junction under a high magnetic field. The co-propagating p and n quantum Hall edge channels traveling along the pn interface functions as a built-in Aharonov-Bohm-type interferometer, the interferences in which are sensitive to both the external magnetic field and the carrier concentration. The trajectories of peak and dip in the observed resistance oscillation are well reproduced by our numerical calculation that assumes magnetic flux quantization in the area enclosed by the co-propagating edge channels. Coherent nature of the co-propagating edge channels is confirmed by the checkerboard-like pattern in the dc-bias and magnetic-field dependences of the resistance oscillations.
Authors:
;  [1] ; ;  [1] ;  [2] ; ;  [3]
  1. Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505 (Japan)
  2. (Japan)
  3. National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044 (Japan)
Publication Date:
OSTI Identifier:
22399012
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; AHARONOV-BOHM EFFECT; CONCENTRATION RATIO; ELECTRIC CONDUCTIVITY; ELECTRIC CONTACTS; GRAPHENE; INTERFACES; INTERFERENCE; INTERFEROMETERS; MAGNETIC FIELDS; MAGNETIC FLUX; OSCILLATIONS; P-N JUNCTIONS; QUANTIZATION