scholarly journals Interband coupling and nonmagnetic interband scattering in±ssuperconductors

2016 ◽  
Vol 93 (22) ◽  
Author(s):  
V. G. Kogan ◽  
R. Prozorov
Keyword(s):  
Interband Scattering ◽  
Interband Coupling

scholarly journals When band convergence is not beneficial for thermoelectrics

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Junsoo Park ◽  
Maxwell Dylla ◽  
Yi Xia ◽  
Max Wood ◽  
G. Jeffrey Snyder ◽  
...  
Keyword(s):  
Charge Carrier ◽  
First Principles ◽  
Design Principle ◽  
Phonon Scattering ◽  
Charge Carrier Concentration ◽  
Deformation Potential ◽  
Interband Scattering ◽  
Improved Performance ◽  
Full Heusler ◽  
Electron Phonon Scattering

AbstractBand convergence is considered a clear benefit to thermoelectric performance because it increases the charge carrier concentration for a given Fermi level, which typically enhances charge conductivity while preserving the Seebeck coefficient. However, this advantage hinges on the assumption that interband scattering of carriers is weak or insignificant. With first-principles treatment of electron-phonon scattering in the CaMg2Sb2-CaZn2Sb2 Zintl system and full Heusler Sr2SbAu, we demonstrate that the benefit of band convergence can be intrinsically negated by interband scattering depending on the manner in which bands converge. In the Zintl alloy, band convergence does not improve weighted mobility or the density-of-states effective mass. We trace the underlying reason to the fact that the bands converge at a one k-point, which induces strong interband scattering of both the deformation-potential and the polar-optical kinds. The case contrasts with band convergence at distant k-points (as in the full Heusler), which better preserves the single-band scattering behavior thereby successfully leading to improved performance. Therefore, we suggest that band convergence as thermoelectric design principle is best suited to cases in which it occurs at distant k-points.

scholarly journals Weak interband coupling inMg10B2: A specific-heat analysis

2006 ◽  
Vol 73 (6) ◽  
Author(s):  
A. Wälte ◽  
S.-L. Drechsler ◽  
G. Fuchs ◽  
K.-H. Müller ◽  
K. Nenkov ◽  
...  
Keyword(s):  
Specific Heat ◽  
Interband Coupling

Anisotropic Order Parameter in Two-Band Superconductivity

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3099-3101 ◽  
Author(s):  
P. Konsin ◽  
N. Kristoffel ◽  
P. Rubin
Keyword(s):  
Order Parameter ◽  
Equation System ◽  
Order Parameters ◽  
Band Model ◽  
Gap Equation ◽  
Narrow Region ◽  
Interband Scattering ◽  
Parameter Symmetry ◽  
Order Parameter Symmetry

A two-overlapping band model of superconductivity with s+d interband scattering is investigated. The gap equation system has been solved numerically. Solutions of pure-d and -s, or of mixed s+d nature are possible. The pure Tcd(μ) or Tcs(μ) curves determine the onset of superconductivity with temperature lowering. In the under- and over-doped region pure-symmetry orderings are preferred. Mixed ordering can exist in a narrow region of μ, becoming narrower with T rising. The peculiarities of the and spectra are reflected in the behaviour of the order parameters. Order parameter symmetry can change with T and μ.

Polarization of gain and symmetry breaking by interband coupling in quantum well lasers

2006 ◽  
Vol 100 (6) ◽  
pp. 063108 ◽  
Author(s):  
Fredrik Boxberg ◽  
Roman Tereshonkov ◽  
Jukka Tulkki
Keyword(s):  
Symmetry Breaking ◽  
Quantum Well ◽  
Quantum Well Lasers ◽  
Interband Coupling

scholarly journals High temperature superconductivity in sulfur hydride under ultrahigh pressure: A complex superconducting phase beyond conventional BCS

2016 ◽  
Vol 2 (1) ◽  
Author(s):  
Annette Bussmann-Holder ◽  
Jürgen Köhler ◽  
M.-H. Whangbo ◽  
Antonio Bianconi ◽  
Arndt Simon
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Transition Temperature ◽  
Hydrogen Bonds ◽  
Pressure Dependence ◽  
High Temperature Superconductivity ◽  
Superconducting Phase ◽  
Ultrahigh Pressure ◽  
Phonon Modes ◽  
Interband Coupling

AbstractThe recent report of superconductivity under high pressure at the record transition temperature of Tc =203 K in pressurized H2S has been identified as conventional in view of the observation of an isotope effect upon deuteration. Here it is demonstrated that conventional theories of superconductivity in the sense of BCS or Eliashberg formalisms cannot account for the pressure dependence of the isotope coefficient. The only way out of the dilemma is a multi-band approach of superconductivity where already small interband coupling suffices to achieve the high values of Tc together with the anomalous pressure dependent isotope coefficient. In addition, it is shown that anharmonicity of the hydrogen bonds vanishes under pressure whereas anharmonic phonon modes related to sulfur are still active.

scholarly journals Occupation-Constrained Interband dynamics of a Non-Hermitian Two-Band Bose–Hubbard Hamiltonian

2017 ◽  
Vol 16 (03) ◽  
pp. 1750023
Author(s):  
Manuel H. Muñoz-Arias ◽  
Carlos A. Parra-Murillo ◽  
Javier Madroñero ◽  
Sandro Wimberger
Keyword(s):  
Single Site ◽  
Asymptotic State ◽  
Strongly Correlated ◽  
Quantum Zeno Effect ◽  
Decay Channels ◽  
Hubbard Hamiltonian ◽  
Zeno Effect ◽  
Dynamical Features ◽  
Interband Coupling

The interband dynamics of a two-band Bose–Hubbard (BH) model is studied with strongly correlated bosons forming single-site double occupancies referred to as doublons. Our model for resonant doublon interband coupling exhibits interesting dynamical features such as quantum Zeno effect, the generation of states such as a two-band Bell-like state and an upper-band Mott-like state. The evolution of the asymptotic state is controlled here by the effective opening of one or both of the two bands, which models decay channels.

scholarly journals Role of interband scattering in neutron irradiatedMgB2thin films by scanning tunneling spectroscopy measurements

2007 ◽  
Vol 75 (1) ◽  
Author(s):  
R. Di Capua ◽  
H. U. Aebersold ◽  
C. Ferdeghini ◽  
V. Ferrando ◽  
P. Orgiani ◽  
...  
Keyword(s):  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Interband Scattering
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