P Coleman et al 2002 J. Phys.: Condens. Matter 14 L205 doi:10.1088/0953-8984/14/8/105
Oscillatory instabilities in dc-biased quantum dots
FREE ARTICLEP Coleman1, C Hooley1,2, Y Avishai3, Y Goldin3 and A F Ho4
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We consider a `quantum dot' in the Coulomb blockade regime, subject to an arbitrarily large source-drain voltage V. When V is small, quantum dots with odd electron occupation display the Kondo effect, giving rise to enhanced conductance. Here we investigate the regime where V is increased beyond the Kondo temperature and the Kondo resonance splits into two components. It is shown that interference between them results in spontaneous oscillations of the current through the dot. The theory predicts the appearance of `Shapiro steps' in the current-voltage characteristics of an irradiated quantum dot; these would constitute an experimental signature of the predicted effect.
- PACS
- Subjects
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Condensed matter: electrical, magnetic and optical
- Dates
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Issue 8 (4 March 2002)
Received 26 November 2001
Published 15 February 2002
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Oscillatory instabilities in dc-biased quantum dots
P Coleman et al 2002 J. Phys.: Condens. Matter 14 L205
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