Intrinsic metastabilities in the charge configuration of a double quantum dot

D. E. F.  Biesinger; C. P. Scheller; Bernd Braunecker; J. Zimmerman; A. C. Gossard; D. M. Zumbühl

doi:10.1103/PhysRevLett.115.106804

Intrinsic metastabilities in the charge configuration of a double quantum dot

D. E. F. Biesinger, C. P. Scheller, Bernd Braunecker, J. Zimmerman, A. C. Gossard, D. M. Zumbühl

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Article number	106804
Number of pages	6
Journal	Physical Review Letters
Volume	115
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevLett.115.106804
Publication status	Published - 4 Sept 2015

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10.1103/PhysRevLett.115.106804

Braunecker_2015_PRL_Intrinsic
© 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://doi.org/10.1103/PhysRevLett.115.106804
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title = "Intrinsic metastabilities in the charge configuration of a double quantum dot",

abstract = "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.",

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note = "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). ",

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AU - Biesinger, D. E. F.

AU - Scheller, C. P.

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AU - Zimmerman, J.

AU - Gossard, A. C.

AU - Zumbühl, D. M.

N1 - 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).

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N2 - 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.

AB - 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.

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Intrinsic metastabilities in the charge configuration of a double quantum dot

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Bernd Braunecker

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Intrinsic metastabilities in the charge configuration of a double quantum dot

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