• Rapid Communication

Phase transition, spin-charge separation, and spin filtering in a quantum dot

Michael Pustilnik and László Borda
Phys. Rev. B 73, 201301(R) – Published 1 May 2006

Abstract

We consider low temperature transport through a lateral quantum dot asymmetrically coupled to two conducting leads, and tuned to the mixed-valence region separating two adjacent Coulomb blockade valleys with spin S=12 and S=1 on the dot. We demonstrate that this system exhibits a quantum phase transition driven by the gate voltage. In the vicinity of the transition, the spin on the dot is quantized, even though the fluctuations of charge are strong. The spin-charge separation leads to an unusual Fano-like dependence of the conductance on the gate voltage and to an almost perfect spin polarization of the current through the dot in the presence of a magnetic field.

  • Figure
  • Figure
  • Received 7 March 2006

DOI:https://doi.org/10.1103/PhysRevB.73.201301

©2006 American Physical Society

Authors & Affiliations

Michael Pustilnik1 and László Borda2

  • 1School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
  • 2Research Group “Theory of Condensed Matter” of the Hungarian Academy of Sciences, Institute of Physics, TU Budapest, Budafoki út 8., H-1521, Hungary

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 73, Iss. 20 — 15 May 2006

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×