TY - JOUR

T1 - Experimental demonstration of spin geometric phase

T2 - Radius dependence of time-reversal aharonov-casher oscillations

AU - Nagasawa, Fumiya

AU - Takagi, Jun

AU - Kunihashi, Yoji

AU - Kohda, Makoto

AU - Nitta, Junsaku

PY - 2012/2/21

Y1 - 2012/2/21

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevLett.108.086801

DO - 10.1103/PhysRevLett.108.086801

M3 - Article

AN - SCOPUS:84857539748

SN - 0031-9007

VL - 108

JO - Physical Review Letters

JF - Physical Review Letters

IS - 8

M1 - 086801

ER -