Phase Information from Two-Terminal Conductance of Quantum Dot Systems
Tomohiro Otsuka, Hisashi Aikawa, Mikio Eto, Gyong L Khym, Kicheon Kang, Yasuhiro Iye, and Shingo Katsumoto
AIP Conf. Proc. 893 855 (2007)
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Note: ICPS28
Two-terminal devices generally work as "leaky resonators" in coherent transport, which mixes up the quantum phase information from all parts of the devices, e.g., quantum dots (QDs) embedded in them. With the aids of appropriate theoretical modeling, however, we can extract important information on the phase from the total conductance. As typical examples, we here present experiments in a side-coupled QD, and a QD embedded in an
Aharonov-Bohm (AB) ring. In the former, kinetic freedoms transverse and longitudinal to a quantum wire give rise to dramatic change in the interference effect. In the latter, "phase shift locking to π/2" appears as a plateau structure in the conductance. Specialized theoretical models give reasonable explanations to these effects, bringing important
information on the phase of the electron wavefunctions in the QDs.