Direct observation of the Aharonov-Casher phase
M. Koenig, A. Tschetschetkin, E.M. Hankiewicz, Jairo Sinova, V. Hock,, V. Daumer, M. Schaefer, C.R. Becker, H. Buhmann, and L.W. Molenkamp
TL;DR
This paper reports the direct observation of the Aharonov-Casher phase in quantum ring structures, demonstrating how spin-orbit interactions influence electron wave phases through experimental measurements and numerical modeling.
Contribution
It provides the first direct experimental evidence of the Aharonov-Casher phase in HgTe/HgCdTe quantum rings, supported by numerical calculations.
Findings
Non-monotonic phase changes observed in conductance oscillations
Confirmation of the Aharonov-Casher effect through numerical modeling
Modification of electron wave function by an additional phase factor
Abstract
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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