Impurity effects on electrical conductivity of doped bilayer graphene in the presence of a bias voltage

doi:10.1088/1674-1056/25/7/076102

中国物理B ›› 2016, Vol. 25 ›› Issue (7): 76102-076102.doi: 10.1088/1674-1056/25/7/076102

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

Impurity effects on electrical conductivity of doped bilayer graphene in the presence of a bias voltage

E Lotfi, H Rezania, B Arghavaninia, M Yarmohammadi

1 Department of Physics, Sanandaj Branch, Islamic Azad University, Sanandaj, Iran;
2 Department of Physics, Razi University, Kermanshah, Iran;
3 Department of Physics, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran;
4 Young researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran

收稿日期:2016-01-25 修回日期:2016-03-15 出版日期:2016-07-05 发布日期:2016-07-05
通讯作者: E Lotfi E-mail:lotfi.erf@gmail.com

Impurity effects on electrical conductivity of doped bilayer graphene in the presence of a bias voltage

E Lotfi¹, H Rezania², B Arghavaninia³, M Yarmohammadi⁴

1 Department of Physics, Sanandaj Branch, Islamic Azad University, Sanandaj, Iran;
2 Department of Physics, Razi University, Kermanshah, Iran;
3 Department of Physics, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran;
4 Young researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran

Received:2016-01-25 Revised:2016-03-15 Online:2016-07-05 Published:2016-07-05
Contact: E Lotfi E-mail:lotfi.erf@gmail.com

摘要/Abstract

摘要： We address the electrical conductivity of bilayer graphene as a function of temperature, impurity concentration, and scattering strength in the presence of a finite bias voltage at finite doping, beginning with a description of the tight-binding model using the linear response theory and Green's function approach. Our results show a linear behavior at high doping for the case of high bias voltage. The effects of electron doping on the electrical conductivity have been studied via changing the electronic chemical potential. We also discuss and analyze how the bias voltage affects the temperature behavior of the electrical conductivity. Finally, we study the behavior of the electrical conductivity as a function of the impurity concentration and scattering strength for different bias voltages and chemical potentials respectively. The electrical conductivity is found to be monotonically decreasing with impurity scattering strength due to the increased scattering among electrons at higher impurity scattering strength.

关键词: bilayer graphene, Green's function, electrical conductivity

Abstract: We address the electrical conductivity of bilayer graphene as a function of temperature, impurity concentration, and scattering strength in the presence of a finite bias voltage at finite doping, beginning with a description of the tight-binding model using the linear response theory and Green's function approach. Our results show a linear behavior at high doping for the case of high bias voltage. The effects of electron doping on the electrical conductivity have been studied via changing the electronic chemical potential. We also discuss and analyze how the bias voltage affects the temperature behavior of the electrical conductivity. Finally, we study the behavior of the electrical conductivity as a function of the impurity concentration and scattering strength for different bias voltages and chemical potentials respectively. The electrical conductivity is found to be monotonically decreasing with impurity scattering strength due to the increased scattering among electrons at higher impurity scattering strength.

Key words: bilayer graphene, Green's function, electrical conductivity

中图分类号: (Structure of nanoscale materials)

61.46.-w

62.25.-g (Mechanical properties of nanoscale systems) 61.46.Hk (Nanocrystals) 71.10.-w (Theories and models of many-electron systems)

E Lotfi, H Rezania, B Arghavaninia, M Yarmohammadi. Impurity effects on electrical conductivity of doped bilayer graphene in the presence of a bias voltage[J]. 中国物理B, 2016, 25(7): 76102-076102.

E Lotfi, H Rezania, B Arghavaninia, M Yarmohammadi. Impurity effects on electrical conductivity of doped bilayer graphene in the presence of a bias voltage[J]. Chin. Phys. B, 2016, 25(7): 76102-076102.

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Impurity effects on electrical conductivity of doped bilayer graphene in the presence of a bias voltage

Impurity effects on electrical conductivity of doped bilayer graphene in the presence of a bias voltage

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