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Phys. Rev. B 78, 153304 (2008) [4 pages]

Finite-temperature conductance signatures of quantum criticality in double quantum dots

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Luis G. G. V. Dias da Silva1,2, Kevin Ingersent3, Nancy Sandler1, and Sergio E. Ulloa1
1Department of Physics and Astronomy and Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701-2979, USA
2Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
3Department of Physics, University of Florida, P.O. Box 118440, Gainesville, Florida, 32611-8440, USA

Received 13 September 2008; published 9 October 2008

We study the linear conductance through a double-quantum-dot system consisting of an interacting dot in its Kondo regime and an effectively noninteracting dot connected in parallel to metallic leads. Signatures in the zero-bias conductance at temperatures T>0 mark a pair of quantum (T=0) phase transitions between a Kondo-screened many-body ground state and non-Kondo ground states. Notably, the conductance features become more prominent with increasing T, which enhances the experimental prospects for accessing the quantum-critical region through tuning of gate voltages in a single device.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.153304
DOI:
10.1103/PhysRevB.78.153304
PACS:
73.63.Kv, 72.15.Qm
 
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