Differential Conductance for Tunnel Junctions: Effects of d-Wave Gap

1997 ◽  
Vol 11 (29) ◽  
pp. 1285-1294 ◽  
Author(s):  
Biplab Chattopadhyay ◽  
Joydev Lahiri ◽  
A. N. Das
Keyword(s):  
Density Of States ◽  
Tunnel Junctions ◽  
Particle Density ◽  
Differential Conductance ◽  
Tunneling Conductance ◽  
Van Hove Singularity ◽  
Single Particle Density ◽  
Conductance Data ◽  
Quasiparticle Density ◽  
D Wave

Tunneling conductance for N-I-S and S-I-S tunnel junctions are calculated within the framework of an extended van-Hove singularity in the single particle density of states of the superconducting electrode. Results from our calculations are compared with the conductance data of N-I-S and S-I-S junctions consisting of high-T c superconductors. Possible interpretation of the photoemission intensity curves, in terms of the quasiparticle density of states, is considered and predictions are made for conductance including a d-wave pseudogap in the quasiparticle dispersion.

scholarly journals THE SINGLE-PARTICLE DENSITY OF STATES AND THE RESONANCE IN THE AHARONOV–BOHM POTENTIAL

1995 ◽  
Vol 09 (22) ◽  
pp. 1407-1417 ◽  
Author(s):  
ALEXANDER MOROZ
Keyword(s):  
Periodic Function ◽  
Cross Section ◽  
Density Of States ◽  
Single Particle ◽  
Particle Density ◽  
Bound State ◽  
Differential Scattering Cross Section ◽  
Bohm Potential ◽  
Single Particle Density ◽  
Aharonov Bohm

The single-particle densitity of states (DOS) for the Pauli and the Schrödinger Hamiltonians in the presence of an Aharonov–Bohm potential is calculated for different values of the particle magnetic moment. The DOS is a symmetric and periodic function of the flux. The Krein–Friedel formula can be applied to this long-ranged potential when regularized with the zeta function. We have found that whenever a bound state is present in the spectrum it is always accompanied by a resonance. The shape of the resonance is not of the Breit-Wigner type. The differential scattering cross section is asymmetric if a bound state is present and gives rise to the Hall effect. As an application, propagation of electrons in a dilute vortex limit is considered and the Hall resistivity is calculated.

D-WAVE CHECKERBOARD BOSE CONDENSATE OF MOBILE BIPOLARONS

2007 ◽  
Vol 21 (13n14) ◽  
pp. 2301-2312 ◽  
Author(s):  
A. S. ALEXANDROV
Keyword(s):  
Particle Density ◽  
Center Of Mass ◽  
Bose Condensate ◽  
Real Space ◽  
Temperature Dependent ◽  
Finite Center ◽  
Electron Phonon Interaction ◽  
Single Particle Density ◽  
Wave Symmetry ◽  
D Wave

Strong finite-range electron-phonon interaction (EPI) bounds carriers into small mobile bipolarons. The Bogoliubov-de Gennes (BdG) equations are formulated and solved in the strong-coupling limit, when small bipolarons bose-condense with finite center-of-mass momentum, K ≠ 0. There are two energy scales in this regime, a temperature independent incoherent gap Δp and a temperature dependent coherent gap Δc(T, R) modulated in the real space, R. The order parameter has d-wave symmetry in R-space and the single-particle density of states (DOS) reveals checkerboard modulations similar to the checkerboard tunnelling DOS observed in cuprates.

d-Wave Tunnel Junctions

1999 ◽  
Vol 13 (09n10) ◽  
pp. 1295-1299
Author(s):  
A. M. Cucolo ◽  
M. Cuoco ◽  
C. Noce
Keyword(s):  
Weak Coupling ◽  
Tunnel Junctions ◽  
Coupling Model ◽  
Normal Metal ◽  
Tunneling Conductance ◽  
Spin States ◽  
S Wave ◽  
Zero Bias ◽  
Zero Bias Conductance ◽  
D Wave

We study the tunneling spectra for superconductor-insulator-normal metal (S-I-N) tunnel junctions with an s -wave or a d -wave superconductor within the weak-coupling model. We deduce the temperature behavior of tunneling conductance and their peak positions as well as of the zero-bias conductance. The results obtained allow us to discriminate among the two singlet spin states.

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