Valley polarization enhancement and oscillation in asymmetric T junctions

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Detail(s)

Original languageEnglish
Pages (from-to)1967-1971
Journal / PublicationPhysics Letters, Section A: General, Atomic and Solid State Physics
Volume383
Issue number16
Online published22 Mar 2019
Publication statusPublished - 6 Jun 2019

Abstract

We studied the valley dependent transport in a T junction consisting of an armchair lead and two zigzag leads. Electrons transmitted from the armchair lead to the two outgoing zigzag leads can be valley polarized. When the two outgoing leads have different widths, electrons are pushed into the wider lead and as a result, the valley polarization of the current in the narrow lead is enhanced with an oscillatory dependence on energy. The oscillation pattern is determined by the widths of the two zigzag leads. We analyzed the total local density of states of the device region of the junction and cannot find features that attribute this enhancement to quasi-bound state formation.

Research Area(s)

  • Valleytronics, Graphene, Nanostructures, Quantum transport