Affordable Access

deepdyve-link deepdyve-link
Publisher Website

Spin qubits in graphene quantum dots

Authors
  • Trauzettel, B.
  • Bulaev, Denis V.
  • Loss, Daniel
  • Burkard, Guido
Type
Published Article
Publication Date
Jan 19, 2007
Submission Date
Nov 09, 2006
Identifiers
DOI: 10.1038/nphys544
arXiv ID: cond-mat/0611252
Source
arXiv
License
Unknown
External links

Abstract

We propose how to form spin qubits in graphene. A crucial requirement to achieve this goal is to find quantum dot states where the usual valley degeneracy in bulk graphene is lifted. We show that this problem can be avoided in quantum dots based on ribbons of graphene with semiconducting armchair boundaries. For such a setup, we find the energies and the exact wave functions of bound states, which are required for localized qubits. Additionally, we show that spin qubits in graphene can not only be coupled between nearest neighbor quantum dots via Heisenberg exchange interaction but also over long distances. This remarkable feature is a direct consequence of the quasi-relativistic spectrum of graphene.

Report this publication

Statistics

Seen <100 times