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Transport through (Ga, Mn) As nanoislands: Coulomb blockade and temperature dependence of the conductance

Författare:
  • Markus Schlapps
  • Teresa Lermer
  • Stefan Geissler
  • Daniel Neumaier
  • Janusz Sadowski (Dr)
  • Dieter Schuh
  • Werner Wegscheider
  • Dieter Weiss
Publiceringsår: 2009
Språk: Engelska
Publikation/Tidskrift/Serie: Physical Review B
Volym: 80
Nummer: 12
Dokumenttyp: Artikel
Förlag: American Physical Society

Sammanfattning

We report on magnetotransport measurements of nanoconstricted (Ga, Mn) As devices showing very large resistance changes that can be controlled by both an electric and a magnetic field. Based on the bias voltage and temperature-dependent measurements down to the millikelvin range we compare the models currently used to describe transport through (Ga, Mn) As nanoconstrictions. We provide an explanation for the observed spin-valvelike behavior during a magnetic field sweep by means of the magnetization configurations in the device. Furthermore, we prove that Coulomb blockade plays a decisive role for the transport mechanism and show that modeling the constriction as a granular metal describes the temperature and bias dependence of the conductance correctly and allows to estimate the number of participating islands located in the constriction.

Disputation

Nyckelord

  • Physics and Astronomy

Övriga

Published
Yes
  • ISSN: 1098-0121

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