Thermoelectric response: Fluctuation in fermi temperature by stoichiometry variation in FeSe1-xTex superconductors

2019 ◽  
Author(s):  
Anil K. Yadav ◽  
Veg Singh Bhatt ◽  
Sandeep Yadav ◽  
C. V. Tomy
Keyword(s):  
Fermi Temperature ◽  
Response Fluctuation

Classifying superconductors in a plot of Tc versus Fermi temperature TF

1991 ◽  
Vol 185-189 ◽  
pp. 733-734 ◽  
Author(s):  
Y.J. Uemura
Keyword(s):  
Fermi Temperature

P31Knight shifts and spin dynamics in Si:P at temperatures comparable to the Fermi temperature

2005 ◽  
Vol 71 (3) ◽  
Author(s):  
M. J. R. Hoch ◽  
D. F. Holcomb
Keyword(s):  
Spin Dynamics ◽  
Fermi Temperature

Improved Two-Temperature Model and Its Application in Ultrashort Laser Heating of Metal Films

2005 ◽  
Vol 127 (10) ◽  
pp. 1167-1173 ◽  
Author(s):  
Lan Jiang ◽  
Hai-Lung Tsai
Keyword(s):  
High Electron ◽  
Temperature Model ◽  
Laser Fluences ◽  
Electron Heat Capacity ◽  
Fermi Temperature ◽  
Proposed Model ◽  
Electron Relaxation ◽  
Electron Relaxation Time ◽  
Ultrashort Laser ◽  
Two Temperature

The two-temperature model has been widely used to predict the electron and phonon temperature distributions in ultrashort laser processing of metals. However, estimations of some important thermal and optical properties in the existing two-temperature model are limited to low laser fluences in which the electron temperatures are much lower than the Fermi temperature. This paper extends the existing two-temperature model to high electron temperatures by using full-run quantum treatments to calculate the significantly varying properties, including the electron heat capacity, electron relaxation time, electron conductivity, reflectivity, and absorption coefficient. The proposed model predicts the damage thresholds more accurately than the existing model for gold films when compared with published experimental results.

scholarly journals A degenerate Fermi gas of polar molecules

Science ◽  
2019 ◽  
Vol 363 (6429) ◽  
pp. 853-856 ◽  
Author(s):  
Luigi De Marco ◽  
Giacomo Valtolina ◽  
Kyle Matsuda ◽  
William G. Tobias ◽  
Jacob P. Covey ◽  
...  
Keyword(s):  
Fermi Gas ◽  
Einstein Condensate ◽  
Polar Molecules ◽  
Ultracold Molecules ◽  
Experimental Realization ◽  
Bose Einstein Condensate ◽  
Degenerate Fermi Gas ◽  
Fermi Temperature ◽  
Wide Range ◽  
Bose Einstein

Experimental realization of a quantum degenerate gas of molecules would provide access to a wide range of phenomena in molecular and quantum sciences. However, the very complexity that makes ultracold molecules so enticing has made reaching degeneracy an outstanding experimental challenge over the past decade. We now report the production of a degenerate Fermi gas of ultracold polar molecules of potassium-rubidium. Through coherent adiabatic association in a deeply degenerate mixture of a rubidium Bose-Einstein condensate and a potassium Fermi gas, we produce molecules at temperatures below 0.3 times the Fermi temperature. We explore the properties of this reactive gas and demonstrate how degeneracy suppresses chemical reactions, making a long-lived degenerate gas of polar molecules a reality.

scholarly journals Laser cooling of trapped Fermi gases far below the Fermi temperature

2001 ◽  
Vol 64 (5) ◽  
Author(s):  
Z. Idziaszek ◽  
L. Santos ◽  
M. Lewenstein
Keyword(s):  
Laser Cooling ◽  
Fermi Gases ◽  
Fermi Temperature

Recoil-Limited Laser Cooling ofSr87Atoms near the Fermi Temperature

2003 ◽  
Vol 90 (11) ◽  
Author(s):  
Takashi Mukaiyama ◽  
Hidetoshi Katori ◽  
Tetsuya Ido ◽  
Ying Li ◽  
Makoto Kuwata-Gonokami
Keyword(s):  
Laser Cooling ◽  
Fermi Temperature

scholarly journals Modified Dust-Lower-Hybrid Waves in Quantum Plasma

2018 ◽  
Vol 2 (2) ◽  
pp. 11-21
Author(s):  
Abdul Rauf ◽  
I. Zeba ◽  
Muhammad Saqlain
Keyword(s):  
Dusty Plasma ◽  
Graphical Analysis ◽  
Quantum Plasma ◽  
Lower Hybrid ◽  
Hybrid Wave ◽  
Lower Hybrid Wave ◽  
Quantum Hydrodynamic Model ◽  
Fermi Temperature ◽  
Hybrid Waves ◽  
Lower Hybrid Waves

Dust-lower-hybrid waves in quantum plasma have been studied. The dispersion relation of the dust-lower-hybrid wave has been examined using the quantum hydrodynamic model of plasma in an ultra-cold Fermi dusty plasma in the presence of a uniform external magnetic field. Graphical analysis shows that the electron Fermi temperature effect and the quantum corrections give rise to significant effects on the dust-lower-hybrid wave of the magnetized quantum dusty plasma.

scholarly journals Locality of interatomic forces in tight binding models for insulators

2020 ◽  
Vol 54 (6) ◽  
pp. 2295-2318 ◽  
Author(s):  
Christoph Ortner ◽  
Jack Thomas ◽  
Huajie Chen
Keyword(s):  
Tight Binding ◽  
Interatomic Interaction ◽  
Multiscale Model ◽  
Temperature Limit ◽  
Binding Model ◽  
Interaction Range ◽  
Sharp Estimates ◽  
Multi Scale ◽  
Fermi Temperature ◽  
Scale Models

The tight binding model is a minimalistic electronic structure model for predicting properties of materials and molecules. For insulators at zero Fermi-temperature we show that the potential energy surface of this model can be decomposed into exponentially localised site energy contributions, thus providing qualitatively sharp estimates on the interatomic interaction range which justifies a range of multi-scale models. For insulators at finite Fermi-temperature we obtain locality estimates that are uniform in the zero-temperature limit. A particular feature of all our results is that they depend only weakly on the point spectrum. Numerical tests confirm our analytical results. This work extends Chen and Ortner [Multiscale Model. Simul. 14 (2016) 232–264] and Chen et al. [Arch. Ration. Mech. Anal. 230 (2018) 701–733] to the case of zero Fermi-temperature as well as strengthening the results proved therein.

scholarly journals Gate-controlled BCS-BEC crossover in a two-dimensional superconductor

Science ◽  
2021 ◽  
Vol 372 (6538) ◽  
pp. 190-195 ◽  
Author(s):  
Yuji Nakagawa ◽  
Yuichi Kasahara ◽  
Takuya Nomoto ◽  
Ryotaro Arita ◽  
Tsutomu Nojima ◽  
...  
Keyword(s):  
Carrier Density ◽  
Zirconium Nitride ◽  
Einstein Condensation ◽  
Two Dimensional ◽  
Superconducting Transition ◽  
Pseudogap Phase ◽  
Fermion Systems ◽  
Fermi Temperature ◽  
Crossover Behavior ◽  
Bose Einstein

Bardeen-Cooper-Schrieffer (BCS) superfluidity and Bose-Einstein condensation (BEC) are the two extreme limits of the ground state of the paired fermion systems. We report crossover behavior from the BCS limit to the BEC limit realized by varying carrier density in a two-dimensional superconductor, electron-doped zirconium nitride chloride. The phase diagram, established by simultaneous measurements of resistivity and tunneling spectra under ionic gating, demonstrates a pseudogap phase in the low-doping regime. The ratio of the superconducting transition temperature and Fermi temperature in the low–carrier density limit is consistent with the theoretical upper bound expected in the BCS-BEC crossover regime. These results indicate that the gate-doped semiconductor provides an ideal platform for the two-dimensional BCS-BEC crossover without added complexities present in other solid-state systems.

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