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Journal of Electron Microscopy 2005 54(supplement 1):i57-i60; doi:10.1093/jmicro/54.suppl_1.i57
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© The Author 2005. Published by Oxford University Press on behalf of Japanese Society of Microscopy. All rights reserved. For permissions, please email: journals.permissions@oupjournals.org

Article

Conductance through two dots coupled in series: application of the exact solution

Rui Sakano1,* and Norio Kawakami2

1 Department of Physics, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, 560-0043 and 2 Department of Applied Physics, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka Suita Osaka 565-0871, Japan

* To whom correspondence should be addressed. E-mail: sakano{at}tp.ap.eng.osaka-u.ac.jp

Abstract

Using the exact Bethe-ansatz solution, we study the conductance through symmetric and asymmetric double-dot (DD) systems in the Kondo regime, where two quantum dots are coupled in series. The application of the Ward–Takahashi identity enables us to compute the conductance at low temperatures. For strong inter- and intra-dot Coulomb repulsions with weak inter-dot tunneling, we discuss how the Kondo effect evolves for an asymmetric DD system as well as a symmetric DD system in a magnetic field. In particular, we clarify that the conductance is decreased (increased) in the asymmetric DD (symmetric DD in a field), reflecting that the Kondo effect due to inter-dot charge fluctuations is suppressed (enhanced).

Keywords     quantum dot, double quantum dot, Kondo effect, exact solution, conductance, electron correlations

Received      5 April 2004, accepted 15 October 2004


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