Shot noise in electron transport through a double quantum dot: a master equation approach |
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Authors: | Ou-Yang Shi-Hu Lam Chi-Hang and You Jian-Qiang |
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Institution: | Department of Physics and Surface Physics Laboratory (National Key Laboratory), Fudan University, Shanghai 200433, China; Department of Applied Physics, Hong Kong Polytechnic University, Hung Hom, Hong Kong, China |
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Abstract: | We study shot noise in tunneling current through a double
quantum dot connected to two electric leads. We derive two master
equations in the occupation-state basis and the eigenstate basis to
describe the electron dynamics. The approach based on the
occupation-state basis, despite being widely used in many previous
studies, is valid only when the interdot coupling strength is much
smaller than the energy difference between the two dots. In
contrast, the calculations using the eigenstate basis are valid for
an arbitrary interdot coupling. Using realistic model parameters, we
demonstrate that the predicted currents and shot-noise properties
from the two approaches are significantly different when the
interdot coupling is not small. Furthermore, properties of the shot
noise predicted using the eigenstate basis successfully reproduce
qualitative features found in a recent experiment. |
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Keywords: | double quantum dot master equation approach shot noise
in
tunneling current |
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