Zeeman effects on d-wave superconductor and tunneling spectrum in normal-metal/d-wave superconductor tunnel junction |
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Authors: | Dong Zhengchao |
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Institution: | (1) Department of Physics, Huaiyin Teachers College, Jiangsu Province Key Laboratory for Chemistry of Low-Dimensional Materials, Huai’an, 223001, China |
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Abstract: | We study the Zeeman effect on the d-wave superconductor and tunneling spectrum in normal-metal(N)/d-wave superconductor(S) junction by applying a Zeeman magnetic field to the S. It is shown that: (1) the Zeeman magnetic field
can lead to the S gap decreasing, and with the increase in Zeeman energy, the superconducting state is changed to the normal
state, exhibiting a first-order phase transition; (2) the Zeeman magnetic field may make the zero-bias conductance peak split
into two peaks, and the energy difference between the two splitting peaks in the conductance spectrum is equal to 2h
0 (h
0 is the Zeeman energy); (3) both the barrier strength of interface scattering and the temperature can lower the magnitudes
of splitting peaks, of which the barrier strength can lead to the splitting peaks becoming sharp and the temperature can smear
out the peaks, however, neither of them can influence the Zeeman effect. |
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Keywords: | Zeeman effects d-wave superconductor tunneling spectrum |
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