Document Detail

A coherent RC circuit.
MedLine Citation:
PMID:  23146911     Owner:  NLM     Status:  Publisher    
We review the first experiment on dynamic transport in a phase-coherent quantum conductor. In our discussion, we highlight the use of time-dependent transport as a means of gaining insight into charge relaxation on a mesoscopic scale. For this purpose, we studied the ac conductance of a model quantum conductor, i.e. the quantum RC circuit. Prior to our experimental work, Büttiker et al (1993 Phys. Lett. A 180 364-9) first worked on dynamic mesoscopic transport in the 1990s. They predicted that the mesoscopic RC circuit can be described by a quantum capacitance related to the density of states in the capacitor and a constant charge-relaxation resistance equal to half of the resistance quantum h/2e(2), when a single mode is transmitted between the capacitance and a reservoir. By applying a microwave excitation to a gate located on top of a coherent submicronic quantum dot that is coupled to a reservoir, we validate this theoretical prediction on the ac conductance of the quantum RC circuit. Our study demonstrates that the ac conductance is directly related to the dwell time of electrons in the capacitor. Thereby, we observed a counterintuitive behavior of a quantum origin: as the transmission of the single conducting mode decreases, the resistance of the quantum RC circuit remains constant while the capacitance oscillates.
J Gabelli; G Fève; J-M Berroir; B Plaçais
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-12
Journal Detail:
Title:  Reports on progress in physics. Physical Society (Great Britain)     Volume:  75     ISSN:  1361-6633     ISO Abbreviation:  Rep Prog Phys     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  19620690R     Medline TA:  Rep Prog Phys     Country:  -    
Other Details:
Languages:  ENG     Pagination:  126504     Citation Subset:  -    
Laboratoire de Physique des Solides, (UMR 8502), bâtiment 510, Université Paris-Sud, 91405 Orsay, Cedex, France.
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