Fizika Nizkikh Temperatur: Volume 46, Number 7 (July 2020), p. 779-804    ( to contents , go back )

Polaronic effects induced by non-equilibrium vibrons in a single-molecule transistor

O.M. Bahrova and S.I. Kulinich

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
E-mail: kulinich@ilt.kharkov.ua

I.V. Krive

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine

Ukraine Physical Department, V.N. Karazin National University, Kharkiv 61022, Ukraine

Center for Theoretical Physics of Complex Systems, Institute for Basic Science (IBS) Daejeon 34051, Republic of Korea

Received April 16, 2020, published online May 26, 2020

Abstract

Current-voltage characteristics of a single-electron transistor with a vibrating quantum dot were calculated assuming vibrons to be in a coherent (non-equilibrium) state. For a large amplitude of quantum dot oscillations we predict strong suppression of conductance and the lifting of polaronic blockade by bias voltage in the form of steps in I–V curves. The height of the steps differs from the prediction of the Franck–Condon theory (valid for equilibrated vibrons) and the current saturates at lower voltages than for the case, when vibrons are in equilibrium state.

Key words: single-electron transistor, coherent mill, Frank–Condon blockade.

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