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  • Title: Charge sensing and controllable tunnel coupling in a Si/SiGe double quantum dot.
    Author: Simmons CB, Thalakulam M, Rosemeyer BM, Van Bael BJ, Sackmann EK, Savage DE, Lagally MG, Joynt R, Friesen M, Coppersmith SN, Eriksson MA.
    Journal: Nano Lett; 2009 Sep; 9(9):3234-8. PubMed ID: 19645459.
    Abstract:
    We report integrated charge sensing measurements on a Si/SiGe double quantum dot. The quantum dot is shown to be tunable from a single, large dot to a well-isolated double dot. Charge sensing measurements enable the extraction of the tunnel coupling t between the quantum dots as a function of the voltage on the top gates defining the device. Control of the voltage on a single such gate tunes the barrier separating the two dots. The measured tunnel coupling is an exponential function of the gate voltage. The ability to control t is an important step toward controlling spin qubits in silicon quantum dots.
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