Experimental demonstration of spin geometric phase: Radius dependence of time-reversal aharonov-casher oscillations

Fumiya Nagasawa, Jun Takagi, Yoji Kunihashi, Makoto Kohda, Junsaku Nitta

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

A geometric phase of electron spin is studied in arrays of InAlAs/InGaAs two-dimensional electron gas rings. By increasing the radius of the rings, the time-reversal symmetric Aharonov-Casher oscillations of the electrical resistance are shifted towards weaker spin-orbit interaction regions with their shortened period. We conclude that the shift is due to a modulation of the spin geometric phase, the maximum modulation of which is approximately 1.5rad. We further show that the Aharonov-Casher oscillations in various radius arrays collapse onto a universal curve if the radius and the strength of Rashba spin-orbit interaction are taken into account. The result is interpreted as the observation of the effective spin-dependent flux through a ring.

Original languageEnglish
Article number086801
JournalPhysical Review Letters
Volume108
Issue number8
DOIs
Publication statusPublished - 2012 Feb 21

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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