Nonequilibrium Density of State of a Kondo Dot Coupled to Luttinger Liquid

2012 ◽  
Vol 622-623 ◽  
pp. 1826-1829
Author(s):  
Kai Hua Yang ◽  
Yang Chen ◽  
Bei Yun Liu ◽  
Xian He
Keyword(s):  
Density Of States ◽  
Bias Voltage ◽  
Strong Interaction ◽  
Luttinger Liquid ◽  
Equation Of Motion ◽  
Green Functions ◽  
Zero Temperature ◽  
Density Of State ◽  
Weakly Coupled ◽  
Kondo Physics

We theoretically investigate the nonequilibrium density of states (DOS) of a Kondo dot weakly coupled to Luttinger liquid leads by using the equation-of-motion technique of non-equilibrium Green functions. The joint effects of large bias voltage and moderately strong intralead interactions results in nontrivial modifications of the Kondo peak in the DOS. The DOS exhibits a two-channel Kondo physics for moderately strong interaction in the leads at zero temperature.

Tc of intermediate coupling superconductors with a variable electronic density of states (EDOS)

1983 ◽  
Vol 61 (2) ◽  
pp. 212-219
Author(s):  
M. Ashraf ◽  
J. P. Carbotte
Keyword(s):  
Density Of States ◽  
Chemical Potential ◽  
Present Calculation ◽  
Zero Temperature ◽  
Intermediate Coupling ◽  
Electronic Density ◽  
Electronic Density Of States ◽  
Dimensionless Ratio ◽  
Arbitrary Position ◽  
Analytical Expressions

Using the model of Leavens and Carbotte for intermediate coupling superconductors, we have derived and evaluated analytical expressions for the critical temperature Tc, and the zero temperature gap Δ0 of those superconductors with a variable electronic density of states (EDOS). EDOS is given by a Lorentzian peak superimposed on a constant background with the chemical potential falling at some arbitrary position within the peak. The most significant modifications occur for a narrow Lorentzian with the peak close to the Fermi level. The value of the dimensionless ratio 2Δ0/kBTc remains close to the Bardeen–Cooper–Schrieffer (BCS) value of 3.53. Also, the present calculation compares very favourably with a previous exact calculation.

DENSITY OF STATES AND ORDER PARAMETER IN DIRTY SUPERCONDUCTORS WITH A WEAKLY BROKEN d-WAVE SYMMETRY

1996 ◽  
Vol 10 (12) ◽  
pp. 537-544 ◽  
Author(s):  
SERGEI V. POKROVSKY
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Density Of States ◽  
Order Parameter ◽  
Zero Temperature ◽  
Scattering Rate ◽  
Wave Symmetry ◽  
Direct Calculations ◽  
D Wave ◽  
Gapless Superconductivity

It is shown by direct calculations that in a superconductor with a slightly violated d-wave symmetry of the order parameter (OP) the impurity driven phase transition from the gapless superconductivity to a state with a finite gap takes place at zero temperature. The corresponding scattering rate is close to the value at which the superconductivity vanishes in the d-superconductor. The behavior of the transition temperature, the OP and the density of states (DOS) is analyzed. The model is plausibly relevant to the BSCCO 2:2:1:2.

The Spin Transport of the Coblt Dimers with Different Directions

2014 ◽  
Vol 543-547 ◽  
pp. 3947-3950
Author(s):  
Shi Wei Ren
Keyword(s):  
Transport Properties ◽  
Spin Polarization ◽  
Density Of States ◽  
Bias Voltage ◽  
Spin Transport ◽  
First Principle ◽  
Transport Direction ◽  
Spin Polarized ◽  
Analysis Calculation

In this paper, the spin transport properties of the coblt dimers parrallel to the transport direction and perpendicular to ransprot direction are investigated by using the first principle analysis. Calculation shows that both the coblt dimers parrallel to the transport direction and perpendicular to ransprot direction give obvious spin polarized density of states and current. It is found that the dimer parrallel to the transport direction have larger spin polarization current.The spin polarized efficiency for the parrallel dimer increase steadily with the increase of the bias voltage. But the the spin polarization for the transverse dimer changes greatly.

scholarly journals On the electronic specific heat in dilute alloys

1978 ◽  
Vol 56 (2) ◽  
pp. 288-291 ◽  
Author(s):  
L. Larose ◽  
F. W. Kus ◽  
J. P. Carbotte
Keyword(s):  
Specific Heat ◽  
Density Of States ◽  
Pure Metal ◽  
Electronic Specific Heat ◽  
Density Of State ◽  
Mass Renormalization ◽  
Dilute Alloys ◽  
State Changes

The coefficient γ of the electronic specific heat is calculated accounting, on the same footing, for the change in the band density of states and the change in the electron–phonon mass renormalization that occurs when small amounts of impurities are added to a pure metal. For alkali alloys it is found that the changes in the mass renormalization are more important than density of state changes.

scholarly journals THE BOLTZMANN EQUATION IN SCALAR FIELD THEORY

1998 ◽  
Vol 13 (24) ◽  
pp. 4281-4288 ◽  
Author(s):  
F. T. BRANDT ◽  
J. FRENKEL ◽  
A. GUERRA
Keyword(s):  
Field Theory ◽  
Scalar Field ◽  
Temperature Limit ◽  
Equation Of Motion ◽  
Green Functions ◽  
Static Case ◽  
Quantum Field ◽  
Scalar Field Theory ◽  
High Temperature Limit ◽  
Classical Transport

We derive the classical transport equation, in scalar field theory with a g2V(ϕ) interaction, from the equation of motion for the quantum field. We obtain a very simple, but iterative, expression for the effective action Γ which generates all the n-point Green functions in the high-temperature limit. An explicit and closed form is given for Γ in the static case.

Sign in / Sign up

Export Citation Format

Share Document