scholarly journals Low-energy effective theory at a quantum critical point of the two-dimensional Hubbard model: Mean-field analysis

2018 ◽  
Vol 98 (23) ◽  
Author(s):  
Kambis Veschgini ◽  
Manfred Salmhofer
Keyword(s):  
Hubbard Model ◽  
Critical Point ◽  
Quantum Critical Point ◽  
Mean Field ◽  
Low Energy ◽  
Field Analysis ◽  
Effective Theory ◽  
Two Dimensional ◽  
Quantum Critical

scholarly journals Proximity of the Superconducting Dome and the Quantum Critical Point in the Two-Dimensional Hubbard Model

2011 ◽  
Vol 106 (4) ◽  
Author(s):  
S.-X. Yang ◽  
H. Fotso ◽  
S.-Q. Su ◽  
D. Galanakis ◽  
E. Khatami ◽  
...  
Keyword(s):  
Hubbard Model ◽  
Critical Point ◽  
Quantum Critical Point ◽  
Two Dimensional ◽  
Quantum Critical

scholarly journals Lattice-shifted nematic quantum critical point in FeSe1−xSx

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
S. Chibani ◽  
D. Farina ◽  
P. Massat ◽  
M. Cazayous ◽  
A. Sacuto ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Critical Point ◽  
Degrees Of Freedom ◽  
Quantum Critical Point ◽  
Substantial Effect ◽  
Low Energy ◽  
Elastic Coupling ◽  
Superconducting Transition ◽  
Local Moments ◽  
Quantum Critical

AbstractWe report the evolution of nematic fluctuations in FeSe1−xSx single crystals as a function of Sulfur content x across the nematic quantum critical point (QCP) xc ~ 0.17 via Raman scattering. The Raman spectra in the B1g nematic channel consist of two components, but only the low energy one displays clear fingerprints of critical behavior and is attributed to itinerant carriers. Curie–Weiss analysis of the associated nematic susceptibility indicates a substantial effect of nemato-elastic coupling, which shifts the location of the nematic QCP. We argue that this lattice-induced shift likely explains the absence of any enhancement of the superconducting transition temperature at the QCP. The presence of two components in the nematic fluctuations spectrum is attributed to the dual aspect of electronic degrees of freedom in Hund’s metals, with both itinerant carriers and local moments contributing to the nematic susceptibility.

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