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; S Tarucha

doi:10.1103/PhysRevLett.117.236802

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

Phys Rev Lett. 2016 Dec 2;117(23):236802. doi: 10.1103/PhysRevLett.117.236802. Epub 2016 Nov 29.

Authors

H Kiyama¹, T Nakajima², S Teraoka³, A Oiwa^{1

4}, S Tarucha^{2

3}

Affiliations

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

PMID: 27982642
DOI: 10.1103/PhysRevLett.117.236802

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.