Pauli spin blockade and influence of hyperfine interaction in vertical quantum dot molecule with six-electrons

Shinichi Amaha, Tetsuo Kodera, Tsuyoshi Hatano, Keiji Ono, Yasuhiro Tokura, Seigo Tarucha, James A. Gupta, David Guy Austing

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We investigate Pauli spin blockade and the influence of hyperfine interaction for a system of six-electrons in a device composed of two weakly coupled vertical quantum dots. As a consequence of a large built-in offset energy between the dots, the relevant charge configurations consist of one (zero) and five (six) electrons on the upstream dot and downstream dot respectively. On sweeping the out-of-dot-plane magnetic field up and down, abrupt steps and hysteresis in the leakage current are observed in the Pauli spin blockade region that evolve systematically with bias. We propose a model to explain our observations in terms of hyperfine induced singlet-triplet mixing.

Original languageEnglish
Article number023701
Journaljournal of the physical society of japan
Volume80
Issue number2
DOIs
Publication statusPublished - 2011 Feb 1

Keywords

  • Coupled quantum dots
  • Hyperfine interaction
  • Pauli spin blockade

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Amaha, S., Kodera, T., Hatano, T., Ono, K., Tokura, Y., Tarucha, S., Gupta, J. A., & Austing, D. G. (2011). Pauli spin blockade and influence of hyperfine interaction in vertical quantum dot molecule with six-electrons. journal of the physical society of japan, 80(2), [023701]. https://doi.org/10.1143/JPSJ.80.023701