Eur. Phys. J. D (2014) 68: 152
https://doi.org/10.1140/epjd/e2014-50163-x

Regular Article

Tunable self-Kerr nonlinearity with voltage sensing in double quantum dot system

Department of Applied Physics, College of Electronics, Communication and Physics, Shandong University of Science and Technology, Qingdao 266590, P.R. China

^a e-mail: pengyd@sdust.edu.cn
^b e-mail: jianglin2808@126.com

Received: 28 February 2014
Received in final form: 4 April 2014
Published online: 23 June 2014

Abstract

We present theoretical study of large self-Kerr nonlinearity in double quantum dot system and an efficient scheme to monitor voltage fluctuation. Due to resonant tunneling, constructive interference occurs for the self-Kerr nonlinearity. At some frequency detuning, the nonlinearity could be enhanced about one order of magnitude larger than that on resonance. The Kerr nonlinearity is sensitive to the tunneling, which can be used to sense voltage fluctuation, and it sensitivity could be of 0.2 μeV from simulation.