Effects of band structure and electron–phonon coupling on charge density waves

2013 ◽  
Vol 91 (6) ◽  
pp. 487-489 ◽  
Author(s):  
Jason W. Sadowski ◽  
K. Tanaka ◽  
Yuki Nagai
Keyword(s):  
Band Structure ◽  
Fermi Surface ◽  
Hubbard Model ◽  
Charge Density ◽  
Charge Density Waves ◽  
Phonon Coupling ◽  
Density Waves ◽  
Electron Phonon Coupling ◽  
Half Filling ◽  
Attractive Hubbard Model

We examine the effects of band structure and electron–phonon interactions on charge density waves (CDW) in terms of the extended attractive Hubbard model at half filling. It is shown that van Hove singularities well below the Fermi surface can lead to a substantial energy gain by electron–phonon coupling and result in the formation of CDW.

scholarly journals Quasiparticle Spectra, Charge-Density Waves, Superconductivity, and Electron-Phonon Coupling in2H−NbSe2

2004 ◽  
Vol 92 (8) ◽  
Author(s):  
T. Valla ◽  
A. V. Fedorov ◽  
P. D. Johnson ◽  
P-A. Glans ◽  
C. McGuinness ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Waves ◽  
Phonon Coupling ◽  
Density Waves ◽  
Electron Phonon Coupling

scholarly journals Monolayer VTe2 : Incommensurate Fermi surface nesting and suppression of charge density waves

2019 ◽  
Vol 99 (24) ◽  
Author(s):  
Katsuaki Sugawara ◽  
Yuki Nakata ◽  
Kazuki Fujii ◽  
Kosuke Nakayama ◽  
Seigo Souma ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Charge Density ◽  
Charge Density Waves ◽  
Density Waves ◽  
Fermi Surface Nesting

NONSTATIONARY JOSEPHSON EFFECT AND QUASIPARTICLE TUNNELING BETWEEN PARTIALLY-DIELECTRIZED SUPERCONDUCTORS WITH CHARGE-DENSITY WAVES

1993 ◽  
Vol 07 (22) ◽  
pp. 3927-3935 ◽  
Author(s):  
A.M. GABOVICH
Keyword(s):  
Experimental Data ◽  
Fermi Surface ◽  
Charge Density ◽  
Excitation Spectrum ◽  
Josephson Effect ◽  
Tunnel Junctions ◽  
Charge Density Waves ◽  
Density Waves ◽  
Quasiparticle Tunneling ◽  
Current Voltage

The tunnel junctions between superconductors where the Fermi surface (FS) is partially dielectrized are considered. The dielectrization due to Coulomb- and (or) electron-phonon interactions leads to the emergence of the dielectric gap Σ on nested FS sections and the existence of the charge-density waves below temperature T=T d . When T<T c <T d the partially-dielectrized metals become superconductors with a corresponding gap ∆. The voltage dependences of the nonstationary Josephson current and quasiparticle current are calculated for such junctions. The current-voltage (I–V) characteristics involve several Riedel-type singularities and jumps for voltages equal to definite combinations of gaps ∆ and Σ in the fermion excitation spectrum. So, I–V curves are much more complex than the ones for usual BCS-type superconductors. The results for quasiparticle tunneling agree with the experimental data available for oxides.

Conduction-band structure and charge-density waves in 1T-TaS2

1990 ◽  
Vol 41 (12) ◽  
pp. 8270-8277 ◽  
Author(s):  
R. Claessen ◽  
B. Burandt ◽  
H. Carstensen ◽  
M. Skibowski
Keyword(s):  
Band Structure ◽  
Charge Density ◽  
Conduction Band ◽  
Charge Density Waves ◽  
Density Waves

scholarly journals Electronic nature of charge density wave and electron-phonon coupling in kagome superconductor KV3Sb5

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Hailan Luo ◽  
Qiang Gao ◽  
Hongxiong Liu ◽  
Yuhao Gu ◽  
Dingsong Wu ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Fermi Surface ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Phonon Coupling ◽  
Electronic Nature ◽  
Electron Phonon Coupling ◽  
Gap Opening ◽  
Fermi Surface Reconstruction

AbstractThe Kagome superconductors AV3Sb5 (A = K, Rb, Cs) have received enormous attention due to their nontrivial topological electronic structure, anomalous physical properties and superconductivity. Unconventional charge density wave (CDW) has been detected in AV3Sb5. High-precision electronic structure determination is essential to understand its origin. Here we unveil electronic nature of the CDW phase in our high-resolution angle-resolved photoemission measurements on KV3Sb5. We have observed CDW-induced Fermi surface reconstruction and the associated band folding. The CDW-induced band splitting and the associated gap opening have been revealed at the boundary of the pristine and reconstructed Brillouin zones. The Fermi surface- and momentum-dependent CDW gap is measured and the strongly anisotropic CDW gap is observed for all the V-derived Fermi surface. In particular, we have observed signatures of the electron-phonon coupling in KV3Sb5. These results provide key insights in understanding the nature of the CDW state and its interplay with superconductivity in AV3Sb5 superconductors.

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