Intrinsic Metastabilities in the Charge Configuration of a Double Quantum Dot

Biesinger, D. E. F. and Scheller, C. P. and Braunecker, B. and Zimmerman, B. and Gossard, A. C. and Zumbühl, D. M.. (2015) Intrinsic Metastabilities in the Charge Configuration of a Double Quantum Dot. Physical review letters, 115. p. 106804.

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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 back action 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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Quantenphysik (Zumbühl)
UniBasel Contributors:Biesinger, Daniel and Scheller, Christian Philipp and Zumbühl, Dominik M
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:30 Jun 2016 11:01
Deposited On:12 May 2016 07:16

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