LOCAL ISOMORPHISM, LANDAU THEORY, AND MATCHING RULES IN QUASICRYSTALS

1986 ◽  
Vol 47 (C3) ◽  
pp. C3-125-C3-134 ◽  
Author(s):  
D. LEVINE
Keyword(s):  
Landau Theory ◽  
Local Isomorphism ◽  
Matching Rules

Landau theory of phase transitions in TTF-TCNQ

1980 ◽  
Vol 41 (7) ◽  
pp. 677-699 ◽  
Author(s):  
C. Hartzstein ◽  
V. Zevin ◽  
M. Weger
Keyword(s):  
Phase Transitions ◽  
Landau Theory

scholarly journals Possible Alterations of Local Gravitational Field Inside a Superconductor

Entropy ◽  
2021 ◽  
Vol 23 (2) ◽  
pp. 193 ◽  
Author(s):  
Giovanni Alberto Ummarino ◽  
Antonio Gallerati
Keyword(s):  
Gravitational Field ◽  
Landau Theory ◽  
Time Dependent ◽  
Qualitative Comparison ◽  
Ginzburg Landau ◽  
High Tc ◽  
Gravitational Fields ◽  
Favorable Conditions

We calculate the possible interaction between a superconductor and the static Earth’s gravitational fields, making use of the gravito-Maxwell formalism combined with the time-dependent Ginzburg–Landau theory. We try to estimate which are the most favorable conditions to enhance the effect, optimizing the superconductor parameters characterizing the chosen sample. We also give a qualitative comparison of the behavior of high–Tc and classical low–Tc superconductors with respect to the gravity/superfluid interplay.

scholarly journals Femtosecond control of phonon dynamics near a magnetic order critical point

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
O. Yu. Gorobtsov ◽  
L. Ponet ◽  
S. K. K. Patel ◽  
N. Hua ◽  
A. G. Shabalin ◽  
...  
Keyword(s):  
Critical Point ◽  
Landau Theory ◽  
Density Wave ◽  
Spin Density Wave ◽  
Vibrational States ◽  
Spin Order ◽  
Lattice Displacement ◽  
Far From Equilibrium ◽  
Crystalline System ◽  
Dynamical Control

AbstractThe spin-phonon interaction in spin density wave (SDW) systems often determines the free energy landscape that drives the evolution of the system. When a passing energy flux, such as photoexcitation, drives a crystalline system far from equilibrium, the resulting lattice displacement generates transient vibrational states. Manipulating intermediate vibrational states in the vicinity of the critical point, where the SDW order parameter changes dramatically, would then allow dynamical control over functional properties. Here we combine double photoexcitation with an X-ray free-electron laser (XFEL) probe to control and detect the lifetime and magnitude of the intermediate vibrational state near the critical point of the SDW in chromium. We apply Landau theory to identify the mechanism of control as a repeated partial quench and sub picosecond recovery of the SDW. Our results showcase the capabilities to influence and monitor quantum states by combining multiple optical photoexcitations with an XFEL probe. They open new avenues for manipulating and researching the behaviour of photoexcited states in charge and spin order systems near the critical point.

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