Order-disorder transition in nanoscopic semiconductor quantum rings

Authors:
Peter Borrmann   Phone: +49-(0)441-798-3362   Fax: +49-(0)441-798-3201
Jens Harting   Phone: +49-(0)441-798-3467   Fax: +49-(0)441-798-3201

Affiliation:
Small systems group   University of Oldenburg, Germany

Files:
http://xxx.lanl.gov/abs/cond-mat/0008464

Date: 20010402

Article: published in Phys. Rev. Lett. 86, 3120 (2001)

Keywords:
Quantum rings, nanoscopic systems, electron correlations, Wigner crystal, Path Integral Monte Carlo.

Abstract:
Using the path integral Monte Carlo technique we show that
semiconductor quantum rings with up to six electrons exhibit a
temperature, ring diameter, and particle number dependent transition
between spin ordered and disordered Wigner crystals. Due to the
small number of particles the transition extends over a broad
temperature range and is clearly identifiable from the electron pair
correlation functions.

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