Effects of a quantum measurement on the electric conductivity: Application to graphene

被引：8
作者：
Bernad, J. Z. [1 ,2 ]
Jaaskelainen, M. [1 ,2 ]
Zulicke, U. [1 ,2 ,3 ]
机构：
[1] Massey Univ, Inst Fundamental Sci, Palmerston North 4442, New Zealand
[2] Massey Univ, MacDiarmid Inst Adv Mat & Nanotechnol, Palmerston North 4442, New Zealand
[3] Massey Univ, Ctr Theoret Chem & Phys, Auckland 0745, New Zealand
来源：
PHYSICAL REVIEW B | 2010年 / 81卷 / 07期
关键词：
COLLAPSE;
D O I：
10.1103/PhysRevB.81.073403
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We generalize the standard linear-response (Kubo) theory to obtain the conductivity of a system that is subject to a quantum measurement of the current. Our approach can be used to specifically elucidate how back-action inherent to quantum measurements affects electronic transport. To illustrate the utility of our general formalism, we calculate the frequency-dependent conductivity of graphene and discuss the effect of measurement-induced decoherence on its value in the dc limit. We are able to resolve an ambiguity related to the parametric dependence of the minimal conductivity.
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页数：4
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