Direct observation of the Aharonov-Casher phase
Koenig, M. · Tschetschetkin, A. · Hankiewicz, E. M. · Sinova, Jairo · Hock, V. · Daumer, V. · Schaefer, M. · Becker, C. R. · Buhmann, H. · Molenkamp, L. W.
Original · EN
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-Büttiker formalism.
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