Semiconductor few-electron quantum dot operated as a bipolar spin filter

Abstract

We study the spin states of a few-electron quantum dot defined in a two-dimensional electron gas, by applying a large in-plane magnetic field. We observe the Zeeman splitting of the two-electron spin triplet states. Also, the one-electron Zeeman splitting is clearly resolved at both the zero-to-one and the one-to-two electron transition. Since the spin of the electrons transmitted through the dot is opposite at these two transitions, this device can be employed as an electrically tunable, bipolar spin filter. Calculations and measurements show that higher-order tunnel processes and spin-orbit interaction have a negligible effect on the polarization.

4 pages, 3 figures

References in corpus (1)

• Single-shot read-out of an individual electron spin in a quantum dot

Cited by in corpus (4)

• Single-shot read-out of an individual electron spin in a quantum dot
• Direct control of the tunnel splitting in a one-electron double quantum dot
• Spin filling of a quantum dot derived from excited-state spectroscopy
• Coulomb scattering cross-section in a 2D electron gas and production of entangled electrons