Superconducting switch made of graphene–nanoribbon junctions

by: Qifeng Liang, Jinming Dong

Nanotechnology, Vol. 19, No. 35. (2008), 355706.

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Abstract

The transmission of superconductor-graphene nanoribbon-superconductor junctions (SGS) has been studied by the non-equilibrium Green's function method. It is found that the on-site potential U in the center zigzag graphene nanoribbon (ZGNR) of the SGS junction plays an important role in the magnitude of the supercurrent Ic. As the effective Fermi energy meff (meff = mF[?]U) goes from negative to positive, the SGS junction would suddenly transform from an 'OFF' state to an 'ON' state. And, as meff increases further, the Ic will continue to increase. This switching behavior of the SGS junction shares the same origin with the zigzag GNR valley-isospin valve (Rycerz et al 2007 Nat. Phys. 3 172). Besides the valley-isospin, the density of states will also have an effect on the suppression of Ic.

@article{citeulike:3020660, abstract = {The transmission of superconductor-graphene nanoribbon-superconductor junctions (SGS) has been studied by the non-equilibrium Green's function method. It is found that the on-site potential U in the center zigzag graphene nanoribbon (ZGNR) of the SGS junction plays an important role in the magnitude of the supercurrent Ic. As the effective Fermi energy meff (meff = mF[?]U) goes from negative to positive, the SGS junction would suddenly transform from an 'OFF' state to an 'ON' state. And, as meff increases further, the Ic will continue to increase. This switching behavior of the SGS junction shares the same origin with the zigzag GNR valley-isospin valve (Rycerz et al 2007 Nat. Phys.\&\#160;3 172). Besides the valley-isospin, the density of states will also have an effect on the suppression of Ic.}, author = {Liang, Qifeng and Dong, Jinming }, citeulike-article-id = {3020660}, doi = {10.1088/0957-4484/19/35/355706}, journal = {Nanotechnology}, keywords = {gnr, graphene, superconductivity}, number = {35}, pages = {355706+}, posted-at = {2008-07-19 08:12:24}, priority = {2}, title = {Superconducting switch made of graphene\–nanoribbon junctions}, url = {http://dx.doi.org/10.1088/0957-4484/19/35/355706}, volume = {19}, year = {2008} }

RIS record

TY - JOUR ID - citeulike:3020660 L3 - citeulike-article-id:3020660 TI - Superconducting switch made of graphene–nanoribbon junctions JF - Nanotechnology VL - 19 IS - 35 SP - 355706 N2 - The transmission of superconductor-graphene nanoribbon-superconductor junctions (SGS) has been studied by the non-equilibrium Green's function method. It is found that the on-site potential U in the center zigzag graphene nanoribbon (ZGNR) of the SGS junction plays an important role in the magnitude of the supercurrent Ic. As the effective Fermi energy meff (meff = mF[?]U) goes from negative to positive, the SGS junction would suddenly transform from an 'OFF' state to an 'ON' state. And, as meff increases further, the Ic will continue to increase. This switching behavior of the SGS junction shares the same origin with the zigzag GNR valley-isospin valve (Rycerz et al 2007 Nat. Phys. 3 172). Besides the valley-isospin, the density of states will also have an effect on the suppression of Ic. KW - gnr KW - graphene KW - superconductivity AU - Liang, Qifeng AU - Dong, Jinming PY - 2008/// UR - http://dx.doi.org/10.1088/0957-4484/19/35/355706 ER -

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