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Title: Persistent currents in absence of magnetic field in graphene nanorings: The ambiguous role of inter valley scattering

Persistent currents can arise in normal-metal rings due to a magnetic flux threading the ring in equilibrium. However, can persistent currents arise in absence of magnetic flux in the same normal-metal rings? Yes they can but in a non-equilibrium set-up. This is known as current magnification. In this work, we show that current magnification can be seen in graphene nanorings. Further, graphene can have electrons polarized with a valley quantum number. Electron scattering between valleys can have a non-trivial effect on these persistent currents including inducing a sign change and generating them for parameters where none existed to begin with.
Authors:
 [1] ;  [2]
  1. School of Physical Sciences, National Institute of Science Education and Research, Institute of Physics Campus, Sachivalaya Marg, Bhubaneswar 751005 (India)
  2. Institute of Physics, Sachivalaya Marg, Bhubaneswar 751005 (India)
Publication Date:
OSTI Identifier:
22283235
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 5; Other Information: (c) 2014 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; 77 NANOSCIENCE AND NANOTECHNOLOGY; ELECTRIC CURRENTS; ELECTRONS; EQUILIBRIUM; GRAPHENE; MAGNETIC FIELDS; MAGNETIC FLUX; METALS; NANOSTRUCTURES; SCATTERING