Direct observation of the Aharonov-Casher phase

Details Direct observation of the Aharonov-Casher phase Direct observation of the Aharonov-Casher phase

2005-08-17

arxiv.org/abs/cond-mat/0508396v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.96.076804

Ring structures fabricated from HgTe/HgCdTe quantum wells have been used to study Aharonov-Bohm type conductance oscillations as a function of Rashba spin-orbit splitting strength. We observe non-monotonic phase changes indicating that an additional phase factor modifies the electron wave function. We associate these observations with the Aharonov-Casher effect. This is confirmed by comparison with numerical calculations of the magneto-conductance for a multichannel ring structure within the Landauer-B\"uttiker formalism.

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