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It is shown that the occurrence of metallic conductivity in polymers is due to their electrification. In particular, the current density depends on the electron work function of metallic electrodes which are in contact with the polymer. 相似文献
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Differential conductance in normal-metal/insulator/metal/d-wave superconductor junction carrying a supercurrent 下载免费PDF全文
This paper applies the Bogoliubov--de Gennes equation and
the Blonder--Tinkham--Klapwijk approach to study the oscillatory
behaviour of differential conductance in a normal metal/insulator/metal/d-wave
superconductor junction carrying a
supercurrent Is. We find that (i) a three-humped structure
appears at a nearly critical supercurrent Is and z ≈
0.5 for the normal metal/insulator/metal/d_x2 + y2-wave
superconductor junction; (ii) the zero-bias conductance peak splits
into two peaks with sufficiently large applied current for the normal
metal/insulator/metal/dxy-wave superconductor junction; (iii)
the conductance spectrum exhibits oscillating behaviour with the
bias voltage and the peaks of the resonances are suppressed by
increasing supercurrent Is. 相似文献
3.
We present an analytical result for the supercurrent across a
superconductor/quantum-dot/superconductor junction. By converting the
current integration into a special contour integral, we can express the
current as a sum of the residues of poles. These poles are real and give a
natural definition of the Andreev bound states. We also use the exact result
to explain some features of the supercurrent transport behavior. 相似文献
4.
In this paper we use a numerical method to study the quantum effect of dynamical localization on the supercurrent in a mesoscopic Josephson junction driven by a periodically external electromagnetic field. We find that the charge is localized effectively when the ratio of the field magnitude and the field frequency equal some critical values, and in these cases the amplitude of the oscillation of the supercurrent will remain constant. 相似文献
5.
We present an analytical result for the supercurrent across a superconductor/quantum-dot/superconductor junction. By converting the current integration into a special contour integral, we can express the current as a sum of the residues of poles. These poles are real and give a natural definition of the Andreev bound states. We also use the exact result to explain some features of the supercurrent transport behavior. 相似文献
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7.
《Physica C: Superconductivity and its Applications》1999,320(3-4):259-266
Andreev bound states in monoatomic superconductor–ferromagnet (S/F) superlattices are studied theoretically, assuming tunneling between S and F layers in perpendicular direction. Andreev reflection at S/F interfaces is strongly affected by the exchange interaction h in F layers. In the ground state, only for h≠0 zero-energy states (ZES) are formed on S and F layers. For h=0, corresponding to superconductor–normal metal (S/N) superlattices, ZES may appear in the nonequilibrium phase, =π. This is found both for s-wave and d-wave symmetry of the order parameter in S. The conditions for ZES are obtained as a function of h, of the transfer integral t for movement of quasiparticles (QPs) between S and F layers, and of the corresponding ground state phase difference eq between two neighboring S layers. 相似文献
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