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Charge sensing of excited states in an isolated double quantum dot

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A. C. Johnson, C. M. Marcus, M. P. Hanson, A. C. Gossard

Pulsed electrostatic gating combined with capacitive charge sensing is used to perform excited state spectroscopy of an electrically isolated double-quantum-dot system. The tunneling rate of a single charge moving between the two dots is affected by the alignment of quantized energy levels; measured tunneling probabilities thereby reveal spectral features. Two pulse sequences are investigated, one of which, termed latched detection, allows measurement of a single tunneling event without repetition. Both provide excited-state spectroscopy without electrical contact to the double-dot system.
TidsskriftPhysical Review B
Sider (fra-til)115333
Antal sider4
StatusUdgivet - 31 dec. 2005

ID: 40383225