0.4 and 0.7 conductance anomalies in quantum point contacts
Bychkov, A M; Stace, T M; Bychkov, A M; Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, UK ; Microelectronics Research Centre, Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK; Stace, T M; Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, UK ;
Журнал:
Nanotechnology
Дата:
2007-05-09
Аннотация:
Self-consistent modelling based on local spin-density formalism is employed to calculate the conductance of quantum point contacts at finite temperatures. The total electrostatic potential exhibits spin-dependent splitting, which persists at temperatures up to 0.5 K and gives rise to the anomalies at 0.4 and 0.7 of the conductance quantum (2e<sup>2</sup>/h) occurring simultaneously in the absence of external magnetic fields.
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