scholarly journals Enhancement of superconductivity due to kinetic-energy effect in the strongly correlated phase of the two-dimensional Hubbard model

2021 ◽  
Vol 403 ◽  
pp. 127382
Author(s):  
Takashi Yanagisawa
Keyword(s):  
Kinetic Energy ◽  
Hubbard Model ◽  
Strongly Correlated ◽  
Two Dimensional ◽  
Energy Effect ◽  
Enhancement Of Superconductivity

scholarly journals On the Kinetic Energy Driven Superconductivity in the Two-Dimensional Hubbard Model

2021 ◽  
Vol 6 (1) ◽  
pp. 12
Author(s):  
Takashi Yanagisawa ◽  
Kunihiko Yamaji ◽  
Mitake Miyazaki
Keyword(s):  
Wave Function ◽  
Kinetic Energy ◽  
Hubbard Model ◽  
High Temperature Superconductivity ◽  
Repulsive Interaction ◽  
Two Dimensional ◽  
Condensation Energy ◽  
Energy Effect ◽  
Correlation Operator ◽  
Correlated Electron

We investigate the role of kinetic energy for the stability of superconducting state in the two-dimensional Hubbard model on the basis of an optimization variational Monte Carlo method. The wave function is optimized by multiplying by correlation operators of site off-diagonal type. This wave function is written in an exponential-type form given as ψλ=exp(−λK)ψG for the Gutzwiller wave function ψG and a kinetic operator K. The kinetic correlation operator exp(−λK) plays an important role in the emergence of superconductivity in large-U region of the two-dimensional Hubbard model, where U is the on-site Coulomb repulsive interaction. We show that the superconducting condensation energy mainly originates from the kinetic energy in the strongly correlated region. This may indicate a possibility of high-temperature superconductivity due to the kinetic energy effect in correlated electron systems.

scholarly journals Crossover of Superconducting Properties and Kinetic-Energy Gain in Two-Dimensional Hubbard Model

2004 ◽  
Vol 73 (5) ◽  
pp. 1119-1122 ◽  
Author(s):  
Hisatoshi Yokoyama ◽  
Yukio Tanaka ◽  
Masao Ogata ◽  
Hiroki Tsuchiura
Keyword(s):  
Kinetic Energy ◽  
Hubbard Model ◽  
Energy Gain ◽  
Two Dimensional ◽  
Superconducting Properties

The Departure from Equilibrium of Turbulent Boundary Layers

1968 ◽  
Vol 19 (1) ◽  
pp. 1-19 ◽  
Author(s):  
H. McDonald
Keyword(s):  
Boundary Layer ◽  
Shear Stress ◽  
Kinetic Energy ◽  
Stress Distribution ◽  
Boundary Layers ◽  
Turbulent Boundary Layers ◽  
Two Dimensional ◽  
Pressure Distributions ◽  
Momentum Integral ◽  
State Examination

SummaryRecently two authors, Nash and Goldberg, have suggested, intuitively, that the rate at which the shear stress distribution in an incompressible, two-dimensional, turbulent boundary layer would return to its equilibrium value is directly proportional to the extent of the departure from the equilibrium state. Examination of the behaviour of the integral properties of the boundary layer supports this hypothesis. In the present paper a relationship similar to the suggestion of Nash and Goldberg is derived from the local balance of the kinetic energy of the turbulence. Coupling this simple derived relationship to the boundary layer momentum and moment-of-momentum integral equations results in quite accurate predictions of the behaviour of non-equilibrium turbulent boundary layers in arbitrary adverse (given) pressure distributions.

The pairing symmetries in the two-dimensional Hubbard model

2021 ◽  
pp. 127153
Author(s):  
Ke Liu ◽  
Shuhui Yang ◽  
Weiqi Li ◽  
Tao Ying ◽  
Jianqun Yang ◽  
...  
Keyword(s):  
Hubbard Model ◽  
Two Dimensional ◽  
Pairing Symmetries

scholarly journals Spin diffusion and spin conductivity in the two-dimensional Hubbard model

2021 ◽  
Vol 103 (15) ◽  
Author(s):  
Martin Ulaga ◽  
Jernej Mravlje ◽  
Jure Kokalj
Keyword(s):  
Hubbard Model ◽  
Spin Diffusion ◽  
Two Dimensional
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