Non-adiabatic pumping of single electrons affected by magnetic fields

Details Non-adiabatic pumping of single electrons affected by magnetic fields Non-adiabatic pumping of single electrons affected by magnetic fields

2009-09-15

arxiv.org/abs/0909.2778v1

Physica E 42, 911 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

This article has been submitted to Physica E

Scientific paper

10.1016/j.physe.2009.11.109

Non-adiabatic pumping of discrete charges, realized by a dynamical quantum dot in an AlGaAs/GaAs heterostructure, is studied under influence of a perpendicular magnetic field. Application of an oscillating voltage in the GHz-range to one of two top gates, crossing a narrow wire and confining a quantum dot, leads to quantized pumped current plateaus in the gate characteristics. The regime of pumping one single electron is traced back to the diverse tunneling processes into and out-of the dot. Extending the theory to multiple electrons allows to investigate conveniently the pumping characteristics in an applied magnetic field. In this way, a qualitatively different behavior between pumping even or odd numbers of electrons is extracted.

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