Ultranarrow ionization resonances in a quantum dot under broadband excitation
Name
Gustavsson-2014-Ultranarrow ionization resonances.pdf
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2.34 MB
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Checksum (MD5)
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Author(s)
Rudner, M. S.
Leturcq, R.
Studer, M.
Ihn, Thomas
Ensslin, Klaus
Gustavsson, Simon
Levitov, Leonid
Date Issued
March 2014
Journal
Physical Review B
Publisher
American Physical Society
Citation
Gustavsson, S., M. S. Rudner, L. S. Levitov, R. Leturcq, M. Studer, T. Ihn, and K. Ensslin. “Ultranarrow Ionization Resonances in a Quantum Dot Under Broadband Excitation.” Phys. Rev. B 89, no. 11 (March 2014). © 2014 American Physical Society
Version
Final published version
Abstract
Semiconductor quantum dots driven by the broadband radiation fields of nearby quantum point contacts provide an interesting setting for probing dynamics in driven quantum systems at the nanoscale. We report on real-time charge-sensing measurements of the dot occupation, which reveal sharp resonances in the ionization rate as a function of gate voltage and applied magnetic field. Despite the broadband nature of excitation, the resonance widths are much smaller than the scale of thermal broadening. We show that such resonant enhancement of ionization is not accounted for by conventional approaches relying on elastic scattering processes, but can be explained via a mechanism based on a bottleneck process that is relieved near excited state level crossings. The experiment thus reveals a regime of a strongly driven quantum dynamics in few-electron systems. The theoretical results are in good agreement with observations.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.89.115304
