Transport through (Ga,Mn)As nanoislands: Coulomb-blockade and temperature dependence of the conductance
| Autor: | Stefan Geissler, Dieter Schuh, Werner Wegscheider, Markus Schlapps, Daniel Neumaier, Janusz Sadowski, Teresa Lermer, Dieter Weiss |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Range (particle radiation)
Materials science Coulomb blockade electric admittance measurement gallium arsenide galvanomagnetic effects magnetisation manganese compounds semiconductor devices spin valves wide band gap semiconductors 75.50.Pp 73.23.Hk 73.63.Rt 85.75.Mm Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics ddc:530 Coulomb blockade Conductance FOS: Physical sciences Biasing Magnetic semiconductor Condensed Matter Physics 530 Physik Electronic Optical and Magnetic Materials Magnetic field Magnetization Single electron tunneling Mesoscale and Nanoscale Physics (cond-mat.mes-hall) |
| DOI: | 10.48550/arxiv.0904.3225 |
| Popis: | 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-valve like 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. Comment: 5 pages, 3 figures, completed affiliations and corrected typos |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|