Pauli Spin Blockade and Lifetime-Enhanced Transport in a Si/SiGe double quantum dot

ORAL

Abstract

We analyze electron transport data through a Si/SiGe double quantum dot in terms of spin blockade and lifetime-enhanced transport (LET), which is transport through excited states that is enabled by long spin relaxation times. We present a series of low-bias voltage measurements showing the sudden appearance of a strong tail of current that we argue is an unambiguous signature of LET appearing when the bias voltage becomes greater than the singlet-triplet splitting for the (2,0) electron state. We present eight independent data sets, in both forward and reverse bias regimes, and show that excellent fits to all data sets were obtained using one consistent set of parameters. We also obtain quantitative estimates for the tunneling rates and currents in the reverse bias regime using the Lindblad formalism. [Ref: arXiv:1008.5398v1]

*This work was supported in part by ARO and LPS (W911NF-08-1-0482), by NSF (DMR-08325634, DMR- 0805045), and by DOE (DE-FG02-03ER46028).

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Authors

  • Teck Seng Koh

    • University of Wisconsin-Madison

  • C.B. Simmons

    • University of Wisconsin-Madison

  • Nakul Shaji

    • University of Wisconsin-Madison

  • Madhu Thalakulam

    • University of Wisconsin-Madison

  • L.J. Klein

    • University of Wisconsin-Madison

  • Hua Qin

    • University of Wisconsin-Madison

  • H. Luo

    • University of Wisconsin-Madison

  • D.E. Savage

    • Material Science Center, University of Wisconsin
    • University of Wisconsin-Madison

  • Max Lagally

    • University of Wisconsin-Madison
    • University of Wisconsin Madison

  • A.J. Rimberg

    • Dartmouth College

  • R. Joynt

    • University of Wisconsin-Madison

  • Robert Blick

    • University of Wisconsin-Madison, Electrical \& Computer Engineering
    • University of Wisconsin-Madison

  • Mark Friesen

    • University of Wisconsin- Madison
    • University of Wisconsin-Madison
    • Department of Physics, Unviersity of Wisconsin-Madison, Madison WI 53706
    • U. of Wisconsin

  • S.N. Coppersmith

    • University of Wisconsin- Madison
    • University of Wisconsin-Madison

  • Mark Eriksson

    • Department of Physics, University of Wisconsin
    • University of Wisconsin-Madison
    • University of Wisconsin Madison