scholarly journals Fermi surface fluctuations and single electron excitations near Pomeranchuk instability in two dimensions

2006 ◽  
Vol 73 (4) ◽  
Author(s):  
Luca Dell’Anna ◽  
Walter Metzner
Keyword(s):  
Fermi Surface ◽  
Two Dimensions ◽  
Single Electron ◽  
Surface Fluctuations ◽  
Electron Excitations

Interplay between collective and single electron excitations in large metal clusters

1993 ◽  
Vol 26 (1-4) ◽  
pp. 267-269 ◽  
Author(s):  
T. G�tz ◽  
W. Hoheisel ◽  
F. Tr�ger ◽  
M. Vollmer
Keyword(s):  
Metal Clusters ◽  
Single Electron ◽  
Electron Excitations

Fermi surface renormalization in two dimensions

2004 ◽  
Vol 408-410 ◽  
pp. 254-256 ◽  
Author(s):  
H. Freire ◽  
E. Corrêa ◽  
A. Ferraz
Keyword(s):  
Fermi Surface ◽  
Two Dimensions

Study of single-electron excitations by electron microscopy I. Image contrast from delocalized excitations

1978 ◽  
Vol 38 (5) ◽  
pp. 519-527 ◽  
Author(s):  
A. J. Craven ◽  
J. M. Gibson ◽  
A. Howie ◽  
D. R. Spalding
Keyword(s):  
Electron Microscopy ◽  
Image Contrast ◽  
Single Electron ◽  
Electron Excitations

scholarly journals Fermi surface instabilities in electronic Raman scattering of the metallic kagome lattice CsV3Sb5

2021 ◽  
Author(s):  
Dirk Wulferding ◽  
Seungyeol Lee ◽  
YoungSu Choi ◽  
Qiangwei Yin ◽  
Zhijun Tu ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Charge Density ◽  
Density Wave ◽  
Spectral Weight ◽  
Superconducting Transition ◽  
Electronic Raman Scattering ◽  
Charge Correlations ◽  
Surface Fluctuations ◽  
Out Of Plane ◽  
A Charge

Abstract Understanding the link between a charge density wave (CDW) instability and superconductivity is a central theme of the 2D metallic kagome compounds AV3Sb5 (A=K, Rb, and Cs). Using polarization-resolved electronic Raman spectroscopy, we shed light on Fermi surface fluctuations and electronic instabilities. We observe a quasielastic peak (QEP) whose spectral weight is progressively enhanced towards the superconducting transition. The QEP temperature-dependence reveals a steep increase in coherent in-plane charge correlations within the charge-density phase. In contrast, out-of-plane charge fluctuations remain strongly incoherent across the investigated temperature range. In-plane phonon anomalies appear at T* ≈ 50 K in addition to right below TCDW ≈ 95 K, while showing no apparent evidence of reduced symmetry at low temperatures. In conjunction with the consecutive phonon anomalies within the CDW state, our electronic Raman data unveil additional electronic instabilities that persist down to the superconducting phase, thereby offering a superconducting mechanism.

c-Axis Resistivity Due to Transport of Fermionic Pairs in the Cuprates

1998 ◽  
Vol 12 (06n07) ◽  
pp. 225-230
Author(s):  
Manas Sardar
Keyword(s):  
Electron Transport ◽  
Fermi Surface ◽  
Temperature Dependence ◽  
Carrier Concentration ◽  
Density Of States ◽  
Low Temperatures ◽  
Single Electron ◽  
Acoustic Phonons ◽  
Single Electron Transport

With the assumption of complete incoherence of single electron transport along the c-axis, it is argued that it takes place by coherent hopping of singlet pairs that are fermionic in character. This will lead to a correction to the 1/Tc-axis resistivity calculated by Anderson et al.6 The c-axis resistivity coming from this extra channel of transport is shown to have the same temperature dependence as the inplane resistivity (linear in T) and mildly sensitive to the inplane carrier concentration through the modification of the density of states at the fermi surface. It is argued that the resistivity due to transport in this extra channel will be very sensitive to the c-axis disorder and show an upturn at low temperatures due to c-axis disorder and scattering by acoustic phonons.

scholarly journals Effect of paramagnetic fluctuations on a Fermi-surface topological transition in two dimensions

2014 ◽  
Vol 90 (16) ◽  
Author(s):  
Sergey Slizovskiy ◽  
Joseph J. Betouras ◽  
Sam T. Carr ◽  
Jorge Quintanilla
Keyword(s):  
Fermi Surface ◽  
Two Dimensions ◽  
Topological Transition
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