Phase information from two-terminal conductance of quantum dot systems

Tomohiro Otsuka, Hisashi Aikawa, Mikio Eto, Gyong L. Khym, Kicheon Kang, Yasuhiro Iye, Shingo Katsumoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationPhysics of Semiconductors - 28th International Conference on the Physics of Semiconductors, ICPS 2006, Part A and B
Pages855-856
Number of pages2
DOIs
Publication statusPublished - 2007 Dec 1
Event28th International Conference on the Physics of Semiconductors, ICPS 2006 - Vienna, Austria
Duration: 2006 Jul 242006 Jul 28

Publication series

NameAIP Conference Proceedings
Volume893
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other28th International Conference on the Physics of Semiconductors, ICPS 2006
CountryAustria
CityVienna
Period06/7/2406/7/28

Keywords

  • Coulomb blockade
  • Fano effect
  • Kondo effect
  • Quantum dots

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Otsuka, T., Aikawa, H., Eto, M., Khym, G. L., Kang, K., Iye, Y., & Katsumoto, S. (2007). Phase information from two-terminal conductance of quantum dot systems. In Physics of Semiconductors - 28th International Conference on the Physics of Semiconductors, ICPS 2006, Part A and B (pp. 855-856). (AIP Conference Proceedings; Vol. 893). https://doi.org/10.1063/1.2730160