Converging theoretical perspectives on charge pumping. Slava Kashcheyevs Colloquium at Physikalisch-Technische Bundesanstalt (Braunschweig, Germany) November 13 th , 2007. Pumping: definitions. I. rectification photovoltaic effect photon-assisted tunneling ratchets. f.
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Colloquium at Physikalisch-Technische Bundesanstalt (Braunschweig, Germany)
November 13th, 2007
Interested in “small”pumps to witness:
Pumping overlaps with:
DJ Thouless, PRB 27, 6083 (1983)
I = ef (exact integer)
Pump by deforming
Change of interference pattern can induce “waves” traveling to infinity
Y Levinson, O Entin-Wohlman, P Wölfle Physica A 302, 335 (2001)
staying in the ground state
a gapless system!
O Entin, A Aharony, Y LevinsonPRB 65, 195411 (2002)
DV Averin, KK Likharev “Single Electronics” (1991)CWJ Beenakker PRB 44, 1646 (1991)
B. Kaestner, VK, S. Amakawa, L. Li, M. D. Blumenthal, T. J. B. M. Janssen, G. Hein, K. Pierz, T. Weimann, U. Siegner, and H. W. Schumacher, arXiv:0707.0993
Enough time to equilibrate
Charge re-fluxesback to where it came from →I ≈ 0
Tunneling is blocked, while the left-right symmetry switches to opposite
Loading from the left, unloading to the right→I ≈ ef
Tunneling is too slow to catch up with energy level switching
The chrage is “stuck” →I ≈ 0
I / (ef)