Fast single-charge sensing with a rf quantum point contact
2007; American Institute of Physics; Volume: 91; Issue: 16 Linguagem: Inglês
10.1063/1.2794995
ISSN1520-8842
AutoresD. J. Reilly, C. M. Marcus, M. Hanson, A. C. Gossard,
Tópico(s)Semiconductor materials and devices
ResumoWe report high-bandwidth charge sensing measurements using a GaAs quantum point contact embedded in a radio frequency impedance matching circuit (rf-QPC). With the rf-QPC biased near pinch-off where it is most sensitive to charge, we demonstrate a conductance sensitivity of 5×10−6e2∕hHz−1∕2 with a bandwidth of 8MHz. Single-shot readout of a proximal few-electron double quantum dot is investigated in a mode where the rf-QPC back action is rapidly switched.
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