Geometry effects on quasi-particle inelastic scattering rate in a coupled-quantum-layers system at finite temperature: A theoretical study

2016 ◽  
Vol 481 ◽  
pp. 252-256 ◽  
Author(s):  
T. Salavati-fard ◽  
V. Rafee
Keyword(s):  
Inelastic Scattering ◽  
Finite Temperature ◽  
Theoretical Study ◽  
Quasi Particle ◽  
Scattering Rate ◽  
Geometry Effects

scholarly journals Finite-temperature violation of the anomalous transverse Wiedemann-Franz law

2020 ◽  
Vol 6 (17) ◽  
pp. eaaz3522 ◽  
Author(s):  
Liangcai Xu ◽  
Xiaokang Li ◽  
Xiufang Lu ◽  
Clément Collignon ◽  
Huixia Fu ◽  
...  
Keyword(s):  
Wave Function ◽  
Inelastic Scattering ◽  
Finite Temperature ◽  
Room Temperature ◽  
Theoretical Calculations ◽  
Data Accuracy ◽  
Berry Curvature ◽  
Curvature Distribution ◽  
Open Question ◽  
Transverse Response

The Wiedemann-Franz (WF) law has been tested in numerous solids, but the extent of its relevance to the anomalous transverse transport and the topological nature of the wave function, remains an open question. Here, we present a study of anomalous transverse response in the noncollinear antiferromagnet Mn3Ge extended from room temperature down to sub-kelvin temperature and find that the anomalous Lorenz ratio remains close to the Sommerfeld value up to 100 K but not above. The finite-temperature violation of the WF correlation is caused by a mismatch between the thermal and electrical summations of the Berry curvature and not by inelastic scattering. This interpretation is backed by our theoretical calculations, which reveals a competition between the temperature and the Berry curvature distribution. The data accuracy is supported by verifying the anomalous Bridgman relation. The anomalous Lorenz ratio is thus an extremely sensitive probe of the Berry spectrum of a solid.

Experimental and theoretical study of line shapes in 13C(α, α′) inelastic scattering to resonant states

1980 ◽  
Vol 343 ◽  
pp. 133-147 ◽  
Author(s):  
H. Fuchs ◽  
J.A. Nolen ◽  
G.J. Wagner ◽  
H. Lenske ◽  
G. Baur
Keyword(s):  
Inelastic Scattering ◽  
Theoretical Study ◽  
Line Shapes ◽  
Resonant States

scholarly journals ON d+id DENSITY WAVE AND SUPERCONDUCTING ORDERINGS IN HOLE-DOPED CUPRATES

2013 ◽  
Vol 27 (13) ◽  
pp. 1330008
Author(s):  
PARTHA GOSWAMI ◽  
AJAY PRATAP SINGH GAHLOT ◽  
PANKAJ SINGH
Keyword(s):  
Chemical Potential ◽  
Density Wave ◽  
Mean Field ◽  
Spectral Weight ◽  
Quasi Particle ◽  
Scattering Rate ◽  
Consistent Manner ◽  
Single Particle Excitation ◽  
The Mean ◽  
Competing Orders

The d+id-density wave (chiral DDW) order, at the anti-ferromagnetic wave vector Q = (π, π), is assumed to represent the pseudo-gap (PG) state of a hole-doped cuprate superconductor. The pairing interaction U(k, k′) required for d+id ordering comprises of (Ux2-y2(k, k′), Uxy(k, k′)), where [Formula: see text] and [Formula: see text] with U1 > U2. The d-wave superconductivity (DSC), driven by an assumed attractive interaction of the form [Formula: see text] where V1 is a model parameter, is discussed within the mean-field framework together with the d+id ordering. The single-particle excitation spectrum in the CDDW + DSC state is characterized by the Bogoluibov quasi-particle bands — a characteristic feature of SC state. The coupled gap equations are solved self-consistently together with the equation to determine the chemical potential (μ). With the pinning of the van Hove-singularities close to μ, one is able to calculate the thermodynamic and transport properties of the under-doped cuprates in a consistent manner. The electron specific heat displays non-Fermi liquid feature in the CDDW state. The CDDW and DSC are found to represent two competing orders as the former brings about a depletion of the spectral weight (and Raman response function density) available for pairing in the anti-nodal region of momentum space. It is also shown that the depletion of the spectral weight below Tc at energies larger than the gap amplitude occurs. This is an indication of the strong-coupling superconductivity in cuprates. The calculation of the ratio of the quasi-particle thermal conductivity αxx and temperature in the superconducting phase is found to be constant in the limit of near-zero quasi-particle scattering rate.

ANOMALOUS TEMPERATURE EFFECT ON POINT-CONTACT Ag–LaBa2Cu3O7-x CONDUCTANCE SPECTRA

2000 ◽  
Vol 14 (22n23) ◽  
pp. 819-825 ◽  
Author(s):  
E. HATTA ◽  
V. M. SVISTUNOV ◽  
Yu. F. REVENKO ◽  
M. A. BELOGOLOVSKII ◽  
N. A. DOROSHENKO ◽  
...  
Keyword(s):  
Inelastic Scattering ◽  
Point Contact ◽  
Proximity Effects ◽  
Charge Carriers ◽  
Differential Conductance ◽  
Anomalous Temperature ◽  
Bulk Ceramic ◽  
Scattering Rate ◽  
Wide Range ◽  
Superconducting Parameters

The observation of an anomalous temperature behavior of the differential conductance versus voltage curves in contacts formed by an Ag tip and a bulk ceramic LaBa2Cu3O7-x with Tc around 92 K is reported. For a wide range of temperatures from Tc to helium-liquid ones, we have found a crossover from curves typical for a pure conducting normal metal–superconductor interface up to Giaever tunneling characteristics with gap features shifted to high biases. We take into account the existence of a degraded interlayer with suppressed superconducting parameters between a normal injector and a superconducting bulk and interpret qualitatively the data in terms of mesoscopic proximity effects. We argue that as the temperature is decreased, (i) the electron localization in a disordered region is enhanced, and (ii) in the interlayer, inelastic scattering processes become more effective. The latter was considered as a result of the inelastic scattering rate changes for charge carriers interacting with magnetic excitations in the near-interface region of high-Tc compound junctions.

scholarly journals Semiconducting phase of hafnium dioxide under high pressure: a theoretical study by quasi-particle GW calculations

2021 ◽  
Vol 8 (10) ◽  
pp. 105901
Author(s):  
Thipok Bovornratanaraks ◽  
Rajeev Ahuja ◽  
Prutthipong Tsuppayakorn-aek
Keyword(s):  
High Pressure ◽  
Theoretical Study ◽  
Hafnium Dioxide ◽  
Quasi Particle
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