Coherent level mixing in dot energy spectra measured by magnetoresonant tunneling spectroscopy of vertical quantum dot molecules

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.81.245310
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TypeArticle
Journal titlePhysical Review B, condensed matter and materials physics
Volume81
Issue24
Pages245310-1245310-15; # of pages: 15
AbstractWe study by magnetoresonant tunneling spectroscopy single-particle energy spectra of the constituent weakly coupled dots in vertical quantum dot molecules over a wide energy window. The measured energy spectra are well modeled by calculated spectra for dots with in-plane confinement potentials that are elliptical and parabolic in form. However, in the regions where two, three, or four single-particle energy levels are naively expected to cross, we observe pronounced level anticrossing behavior and strong variations in the resonant currents as a consequence of coherent mixing induced by small deviations in the nearly ideal dot confinement potentials. We present detailed analysis of the energy spectra, and focus on two examples of three-level crossings whereby the coherent mixing leads to concurrent suppression and enhancement of the resonant currents when the anticrossing levels are minimally separated. The suppression of resonant current is of particular interest since it is a signature of dark state formation due to destructive interference. We also describe in detail and compare two measurement strategies to reliably extract the resonant currents required to characterize the level mixing.
Publication date
LanguageEnglish
AffiliationNRC Institute for Microstructural Sciences; National Research Council Canada; NRC Institute for National Measurement Standards; NRC Institute for Nutrisciences and Health
Peer reviewedNo
NPARC number17131342
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Record identifier11187eb3-a7f1-4735-af55-28aa3dcf465e
Record created2011-03-26
Record modified2016-05-09
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