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 aid of appropriate theoretical modeling, however, we can extract important information on the phase from the total conductance. As typical examples, we present here experiments in a side‐coupled QD, and a QD embedded in an Aharonov‐Bohm (AB) ring. In the former, kinetic degrees of 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.
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10 April 2007
PHYSICS OF SEMICONDUCTORS: 28th International Conference on the Physics of Semiconductors - ICPS 2006
24-28 July 2006
Vienna (Austria)
Research Article|
April 10 2007
Phase Information from Two‐Terminal Conductance of Quantum Dot Systems
Tomohiro Otsuka;
Tomohiro Otsuka
1Institute for Solid State Physics, University of Tokyo, 5‐1‐5 Kashiwanoha, Chiba, 277‐8581, Japan
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Hisashi Aikawa;
Hisashi Aikawa
1Institute for Solid State Physics, University of Tokyo, 5‐1‐5 Kashiwanoha, Chiba, 277‐8581, Japan
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Mikio Eto;
Mikio Eto
1Institute for Solid State Physics, University of Tokyo, 5‐1‐5 Kashiwanoha, Chiba, 277‐8581, Japan
2Faculty of Science and Technology, Keio University, 3‐14‐1 Hiyoshi, Kohoku‐ku, Yokohama 223‐8522, Japan
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Gyong L. Khym;
Gyong L. Khym
3Dept. Phys., Chonnam National University, Gwangju 500‐757, Korea
3aInstitute for Condensed Matter Theory, Chonnam National University, Gwangju 500‐757, Korea
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Kicheon Kang;
Kicheon Kang
3Dept. Phys., Chonnam National University, Gwangju 500‐757, Korea
3aInstitute for Condensed Matter Theory, Chonnam National University, Gwangju 500‐757, Korea
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Yasuhiro Iye;
Yasuhiro Iye
1Institute for Solid State Physics, University of Tokyo, 5‐1‐5 Kashiwanoha, Chiba, 277‐8581, Japan
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Shingo Katsumoto
Shingo Katsumoto
1Institute for Solid State Physics, University of Tokyo, 5‐1‐5 Kashiwanoha, Chiba, 277‐8581, Japan
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AIP Conf. Proc. 893, 855–856 (2007)
Citation
Tomohiro Otsuka, Hisashi Aikawa, Mikio Eto, Gyong L. Khym, Kicheon Kang, Yasuhiro Iye, Shingo Katsumoto; Phase Information from Two‐Terminal Conductance of Quantum Dot Systems. AIP Conf. Proc. 10 April 2007; 893 (1): 855–856. https://doi.org/10.1063/1.2730160
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