scholarly journals Real-space dynamical mean-field theory of Friedel oscillations in strongly correlated electron systems

2019 ◽  
Vol 100 (11) ◽  
Author(s):  
B. Chatterjee ◽  
J. Skolimowski ◽  
K. Makuch ◽  
K. Byczuk
Keyword(s):  
Mean Field Theory ◽  
Mean Field ◽  
Real Space ◽  
Strongly Correlated Electron Systems ◽  
Strongly Correlated ◽  
Electron Systems ◽  
Strongly Correlated Electron ◽  
Correlated Electron Systems ◽  
Friedel Oscillations ◽  
Correlated Electron

On the Thermoelectric Properties of Layered Cobaltates

2005 ◽  
Vol 886 ◽  
Author(s):  
Qiang Li
Keyword(s):  
High Temperatures ◽  
Thermoelectric Properties ◽  
Mean Field Theory ◽  
Mean Field ◽  
Strongly Correlated ◽  
Electron Systems ◽  
Strongly Correlated Electron ◽  
Quasi Particle ◽  
Correlated Electron Systems ◽  
Correlated Electron

ABSTRACTA study on the thermoelectric properties of layered cobaltates is presented, based on the dynamic mean field theory for strongly correlated electron systems. Electron correlation results in a crossover from coherent quasi-particle excitation at low temperature to incoherent excitation at high temperatures in cobaltates. With an extremely narrow quasi-particle bandwidth (hωc ∼ 50 meV), the thermal destruction of Fermi-liquid occurs at the moderate crossover temperature TM (∼ 200 K), and suggests a new scaling for thermoelectric power S of cobaltates (S ∼ kT/hωc ∼ T/TM) at low temperatures. At high temperatures, the dominating incoherent excitation leads to a weak temperature dependent S, and electric resistivity ρ approaches the Mott-limit ha/e2 ∼ a few mΩ·cm for cobaltates, where a is a lattice constant.

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