کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10713916 | 1025561 | 2012 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Shot noise in HTc superconductor quantum point contact system
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
We study the electrical transport properties of a quantum point contact between a lead and a high Tc superconductor. For this, we use the Hamiltonian approach and non-equilibrium Green functions of the system. The electrical current and the shot noise are calculated with this formalism. We consider dx2ây2, dxy, dx2ây2+is and dxy+is symmetries for the pair potential. Also we explore the s+â and s++ symmetries describing the behavior of the ferropnictides superconductors. We found that for dxy symmetry there is not a zero bias conductance peak and for d+is symmetries there is a displacement of the transport properties. From shot noise and current, the Fano factor is calculated and we found that it takes values of effective charge between e and 2e, this is explained by the diffraction of quasiparticles in the contact. For the s+â and s++ symmetries the results show that the electrical current and the shot noise depend on the mixing coefficient, furthermore, the effective electric charge can take values between 0 and 2e, in contrast with the results obtained for s wave superconductors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 407, Issue 16, 15 August 2012, Pages 3081-3084
Journal: Physica B: Condensed Matter - Volume 407, Issue 16, 15 August 2012, Pages 3081-3084
نویسندگان
J.A. Celis G, William J. Herrera,