Single-Shot Ternary Readout of Two-Electron Spin States in a Quantum Dot Using Spin Filtering by Quantum Hall Edge States

H. Kiyama, T. Nakajima, S. Teraoka, A. Oiwa, and S. Tarucha

Phys. Rev. Lett. 117, 236802 – Published 29 November 2016

Abstract

We report on the single-shot readout of three two-electron spin states—a singlet and two triplet substates—whose $z$ components of spin angular momentum are 0 and $+ 1$ , in a gate-defined GaAs single quantum dot. The three spin states are distinguished by detecting spin-dependent tunnel rates that arise from two mechanisms: spin filtering by spin-resolved edge states and spin-orbital correlation with orbital-dependent tunneling. The three states form one ground state and two excited states, and we observe the spin relaxation dynamics among the three spin states.

Received 6 March 2016

DOI:https://doi.org/10.1103/PhysRevLett.117.236802

Physics Subject Headings (PhySH)

Spin filtering Spin relaxation

Quantum dots Two-dimensional electron gas

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

H. Kiyama^1,*, T. Nakajima², S. Teraoka³, A. Oiwa^1,4, and S. Tarucha^2,3

¹The Institute of Scientific and Industrial Research, Osaka University, 8-1, Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
²Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
³Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku 113-8656, Japan
⁴Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University, Machikaneyama 1-3, Toyonaka, Osaka 560-8531, Japan