Self-consistent mean-field theory of asymmetric first-order structural phase transitions
نویسندگان
چکیده
منابع مشابه
Self-consistent mean-field theory of asymmetric first-order structural phase transitions.
The paper presents a self-consistent mean-field theory for a lattice-dynamical model that exhibits a firstorder structural phase transition. In this model the phase transition is produced because the high-energy structure has lower vibrational frequencies than those of the low-energy structure. This mechanism produces higher entropy in the higher-energy structure and thereby drives a phase tran...
متن کاملLangevin dynamics of fluctuation-induced first-order phase transitions: Self-consistent Hartree approximation
The Langevin dynamics of a system with a scalar-order parameter exhibiting a fluctuation-induced firstorder phase transition is solved within the self-consistent Hartree approximation. Competition between interactions on short and long length scales gives rise to spatial modulations in the order parameter, such as stripes in 2d and lamellae in 3d. We show that when the time scale of observation...
متن کاملFirst-order microcanonical transitions in finite mean-field models
– A microcanonical first order transition, connecting a clustered to a homogeneous phase, is studied from both the thermodynamic and dynamical point of view for a N-body Hamiltonian system with infinite-range couplings. In the microcanonical ensemble specific heat can be negative, but besides that, a microcanonical first order transition displays a temperature discontinuity as the energy is var...
متن کاملQuantum energy gaps and first-order mean-field transitions
We study first-order mean-field quantum phase transitions, in particular the exponentially fast closure of the energy gap with the system size. We consider exactly solvable ferromagnetic models and discuss their relation to the Grover problem to which they reduce in a particular limit. We compute the coefficient in the exponential closure of the gap using an instantonic approach. We also discus...
متن کاملSelf-consistent Mean Field Theory in Weakly Ionized Gas
We present a self-consistent mean field theory of the dynamo in 3D and turbulent diffusion in 2D in weakly ionized gas. We find that in 3D, the backreaction does not alter the beta effect while it suppresses the alpha effect when the strength of a mean magnetic field exceeds the critical value Bc ∼ √ νinτn〈v2〉/Rm. Here, νin, τn, and Rm are ion-neutral collision frequency, correlation time of ne...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review B
سال: 1996
ISSN: 0163-1829,1095-3795
DOI: 10.1103/physrevb.54.3184