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Electron transmission through an ac biased quantum point contact
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
Institute of Physics, Academy of Sciences, 660036 Krasnoyarsk, Russian Federation.
2007 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, Vol. 75, no 23Article in journal (Refereed) Published
Abstract [en]

We consider a transmission through the potential relief created by a split gate constriction (quantum point contact). Simultaneously, dc and ac voltages Vup (t) = V0 + V1 cos ?t and Vdw (t) = V0 + V1 cos (?t+?) are applied to the gates. We show numerically that the in-phase ac voltages (?=0) smear the conductance steps of the stationary conductance, while the antiphase ac voltages (?=p) only shift the conductance steps. Moreover, computation of currents in probing wires connected cross to the time-periodic quantum point contact reveals a net current for ? 0,p. This implies that the Schrödinger equation described by the electron transport under the effect of the time-periodic long electrodes is equivalent to the transmission in the crossed effective magnetic and electric fields, where the in-plane magnetic field b~? is directed along the transport axis and the electric field e~? is directed perpendicular to the plane of electron transport. Then the vector e×b gives rise to the galvanomagnetic current directed cross to the electron transport. © 2007 The American Physical Society.

Place, publisher, year, edition, pages
2007. Vol. 75, no 23
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-49444DOI: 10.1103/PhysRevB.75.235309OAI: diva2:270340
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2011-01-11

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Sadreev, Almas
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The Institute of TechnologyDepartment of Physics, Chemistry and Biology
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