Conductance suppression due to correlated electron transport in coupled double quantum dots

Physical Review B - Condensed Matter and Materials Physics

Volumn 60, Issue 24, 1999, Pages 16906-16912

  Toth G ^a   Orlov, A ^a   Amlani, Islamshah ^a   Lent, C ^a   Bernstein, G ^a   Snider, G ^a  

^a University of Notre Dame   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0013368680     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.60.16906     Document Type: Article

References (40)

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26. The experimental setup of Ref. 20 is similar to that of this paper. The major difference is that Ref. 20 examines the system in the Coulomb blockade regime when tunneling is suppressed and the current comes from cotunneling, while the goal of this paper is to investigate the behavior of two capacitively coupled double-dots when the Coulomb blockade is lifted and the current is due to sequential correlated tunneling events.
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30. One reason for that is the high tunneling resistance. The cotunneling rate is proportional to (Formula presented) while the sequential tunneling rate is proportional to (Formula presented) thus large tunneling resistance helps suppress cotunneling. Another reason is the low source voltage (Formula presented) The cotunneling rate is proportional to the third power of (Formula presented) thus for high enough voltages it could be dominant. Finally, although to get current through the DD, tunneling to higher energy states is necessary, these transitions are never suppressed enough to make cotunneling important (at least in the cases of considerable current flow). Based on cotunneling rate computations (Ref. 3), the error due to neglecting cotunneling turns out to be always less than 5% of the maximum conductance.
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