Non-adiabatic pumping of single electrons affected by magnetic fields

✍ Scribed by C. Leicht; B. Kaestner; V. Kashcheyevs; P. Mirovsky; T. Weimann; K. Pierz; H.W. Schumacher

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 370 KB
• Volume: 42
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/j.physe.2009.11.109

✦ Synopsis

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 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.