Detection of spin polarization utilizing singlet and triplet states in a single-lead quantum dot

Tomohiro Otsuka, Yuuki Sugihara, Jun Yoneda, Shingo Katsumoto, Seigo Tarucha

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We propose and demonstrate a new method to probe local spin polarization in semiconductor microdevices at low and zero magnetic fields. By connecting a single-lead quantum dot to a semiconductor microdevice and monitoring electron tunneling into singlet and triplet states in the dot, we can detect the local spin polarization formed in the target device. We confirm the validity of this detection scheme utilizing spin-split quantum Hall edge states. We also observe nonzero local spin polarization at the device edge in low magnetic fields, which is not detectable with conventional macroscopic probes.

Original languageEnglish
Article number081308
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number8
DOIs
Publication statusPublished - 2012 Aug 31
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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