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Suppression of Zeeman Gradients by Nuclear Polarization in Double Quantum Dots

Frolov, S. M. and Danon, J. and Nadj-Perge, S. and Zuo, K. and van Tilburg, J. W. W. and Pribiag, V. S. and van den Berg, J. W. G. and Bakkers, E. P. A. M. and Kouwenhoven, L. P. (2012) Suppression of Zeeman Gradients by Nuclear Polarization in Double Quantum Dots. Physical Review Letters, 109 (23). Art. No. 236805. ISSN 0031-9007. doi:10.1103/PhysRevLett.109.236805.

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We use electric dipole spin resonance to measure dynamic nuclear polarization in InAs nanowire quantum dots. The resonance shifts in frequency when the system transitions between metastable high and low current states, indicating the presence of nuclear polarization. We propose that the low and the high current states correspond to different total Zeeman energy gradients between the two quantum dots. In the low current state, dynamic nuclear polarization efficiently compensates the Zeeman gradient due to the g-factor mismatch, resulting in a suppressed total Zeeman gradient. We present a theoretical model of electron-nuclear feedback that demonstrates a fixed point in nuclear polarization for nearly equal Zeeman splittings in the two dots and predicts a narrowed hyperfine gradient distribution.

Item Type:Article
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URLURL TypeDescription Paper
Nadj-Perge, S.0000-0002-2916-360X
Additional Information:© 2012 American Physical Society. Received 7 September 2012; published 5 December 2012. We thank M. Rudner, H. Bluhm, E. Rashba, Yu. Nazarov, L. Levitov, L. Vandersypen, and K. Nowack. This work has been supported by NWO/FOM (Netherlands Organization for Scientific Research), by the Alexander von Humboldt Foundation, and through the DARPA program QUEST.
Funding AgencyGrant Number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
Stichting voor Fundamenteel Onderzoek der Materie (FOM)UNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Issue or Number:23
Classification Code:PACS numbers: 73.63.Kv, 72.25.-b
Record Number:CaltechAUTHORS:20160113-070931989
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Official Citation:Suppression of Zeeman Gradients by Nuclear Polarization in Double Quantum Dots S. M. Frolov, J. Danon, S. Nadj-Perge, K. Zuo, J. W. W. van Tilburg, V. S. Pribiag, J. W. G. van den Berg, E. P. A. M. Bakkers, and L. P. Kouwenhoven Phys. Rev. Lett. 109, 236805 (2012) – Published 5 December 2012
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63613
Deposited By: Ruth Sustaita
Deposited On:13 Jan 2016 17:31
Last Modified:10 Nov 2021 23:18

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