Intrinsic metastabilities in the charge configuration of a double quantum dot
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We report a thermally activated metastability in a GaAs double quantum dot exhibiting real-time charge switching in diamond shaped regions of the charge stability diagram. Accidental charge traps and sensor backaction are excluded as the origin of the switching. We present an extension of the canonical double dot theory based on an intrinsic, thermal electron exchange process through the reservoirs, giving excellent agreement with the experiment. The electron spin is randomized by the exchange process, thus facilitating fast, gate-controlled spin initialization. At the same time, this process sets an intrinsic upper limit to the spin relaxation time.
Biesinger , D E F , Scheller , C P , Braunecker , B , Zimmerman , J , Gossard , A C & Zumbühl , D M 2015 , ' Intrinsic metastabilities in the charge configuration of a double quantum dot ' Physical Review Letters , vol 115 , no. 10 , 106804 . DOI: 10.1103/PhysRevLett.115.106804
Physical Review Letters
© 2015 American Physical Society. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at http://dx.doi.org/10.1103/PhysRevLett.115.106804
This work was supported by the Swiss Nanoscience Institute (SNI), NCCR QSIT, Swiss National Science Foundation, ERC starting grant (Project No. 207599), EU-FP7 SOLID (Project No. 248629) and MICROKELVIN (Project No. 228464).