Properties of pseudospin polarization on a graphene-based spin singlet superconducting junction

doi:10.1088/1674-1056/22/8/087408

中国物理B ›› 2013, Vol. 22 ›› Issue (8): 87408-087408.doi: 10.1088/1674-1056/22/8/087408

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Properties of pseudospin polarization on a graphene-based spin singlet superconducting junction

贾拴稳^a, 王军涛^b, 杨艳岭^a, 白春旭^a

a School of Physics, Anyang Normal University, Anyang 455000, China;
b Department of Mathematics, Henan Institute of Science and Technology, Xinxiang 453000, China

收稿日期:2012-10-24 修回日期:2013-01-28 出版日期:2013-06-27 发布日期:2013-06-27
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11147201 and U1204110) and the Key Project of the Chinese Ministry of Education (Grant No. 211100).

Properties of pseudospin polarization on a graphene-based spin singlet superconducting junction

Jia Shuan-Wen (贾拴稳)^a, Wang Jun-Tao (王军涛)^b, Yang Yan-Ling (杨艳岭)^a, Bai Chun-Xu (白春旭)^a

a School of Physics, Anyang Normal University, Anyang 455000, China;
b Department of Mathematics, Henan Institute of Science and Technology, Xinxiang 453000, China

Received:2012-10-24 Revised:2013-01-28 Online:2013-06-27 Published:2013-06-27
Contact: Bai Chun-Xu E-mail:chunxu_bai@yahoo.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11147201 and U1204110) and the Key Project of the Chinese Ministry of Education (Grant No. 211100).

摘要/Abstract

摘要： We investigate theoretically transport characteristics in a graphene-based pseudospinmagnet/superconductor junction, including the s-wave and the d-wave pairing symmetry potential in the superconducting region. It is found that the pseudospin polarization, in sharp contrast to spin polarization in the graphene-based ferromagnet/superconductor junction, holds no influence on the specular Andreev reflection for a negligible Fermi energy. Furthermore, the Fano factor is crucially affected by the zero bias state. Therefore, we suggest here that the findings could shed light on the realization of graphene-based pseudospintronics devices and provide a new way to detect the specular Andreev reflection and the zero bias state in the actual experiments.

关键词: graphene, anisotropic pairing symmetry, pseudospin polarization

Abstract: We investigate theoretically transport characteristics in a graphene-based pseudospinmagnet/superconductor junction, including the s-wave and the d-wave pairing symmetry potential in the superconducting region. It is found that the pseudospin polarization, in sharp contrast to spin polarization in the graphene-based ferromagnet/superconductor junction, holds no influence on the specular Andreev reflection for a negligible Fermi energy. Furthermore, the Fano factor is crucially affected by the zero bias state. Therefore, we suggest here that the findings could shed light on the realization of graphene-based pseudospintronics devices and provide a new way to detect the specular Andreev reflection and the zero bias state in the actual experiments.

Key words: graphene, anisotropic pairing symmetry, pseudospin polarization

中图分类号: (Proximity effects; Andreev reflection; SN and SNS junctions)

74.45.+c

74.78.Fk (Multilayers, superlattices, heterostructures) 72.80.Vp (Electronic transport in graphene)

贾拴稳, 王军涛, 杨艳岭, 白春旭. Properties of pseudospin polarization on a graphene-based spin singlet superconducting junction[J]. 中国物理B, 2013, 22(8): 87408-087408.

Jia Shuan-Wen (贾拴稳), Wang Jun-Tao (王军涛), Yang Yan-Ling (杨艳岭), Bai Chun-Xu (白春旭). Properties of pseudospin polarization on a graphene-based spin singlet superconducting junction[J]. Chin. Phys. B, 2013, 22(8): 87408-087408.

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Properties of pseudospin polarization on a graphene-based spin singlet superconducting junction

Properties of pseudospin polarization on a graphene-based spin singlet superconducting junction

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