title   
  

Valley switch in a graphene superlattice due to pseudo-Andreev reflection

Warning The system is temporarily closed to updates for reporting purpose.

Beenakker, C. W. J. and Gnezdilov, N. V. and Dresselhaus, E. and Ostroukh, V. P. and Herasymenko, Y. and Adagideli, İnanç and Tworzydło, J. (2018) Valley switch in a graphene superlattice due to pseudo-Andreev reflection. Physical Review B: Condensed Matter and Materials Physics, 97 (24). ISSN 1098-0121 (Print) 1550-235X (Online)

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1103/PhysRevB.97.241403

Abstract

Dirac electrons in graphene have a valley degree of freedom that is being explored as a carrier of information. In that context of “valleytronics” one seeks to coherently manipulate the valley index. Here, we show that reflection from a superlattice potential can provide a valley switch: Electrons approaching a pristine-graphene–superlattice-graphene interface near normal incidence are reflected in the opposite valley. We identify the topological origin of this valley switch, by mapping the problem onto that of Andreev reflection from a topological superconductor, with the electron-hole degree of freedom playing the role of the valley index. The valley switch is ideal at a symmetry point of the superlattice potential, but remains close to 100% in a broad parameter range.

Item Type:Article
Subjects:Q Science > QC Physics
Q Science > QC Physics > QC176-176.9 Solids. Solid state physics
ID Code:35660
Deposited By:İnanç Adagideli
Deposited On:15 Aug 2018 21:32
Last Modified:15 Aug 2018 21:32

Repository Staff Only: item control page