Superionic UO2: A model anharmonic crystalline material

Anharmonic collective excitation in a solvable model

G.F. Bertsch, P.F. Bortignon, and K. Hagino 1Institute for Nuclear Theory, Department of Physics, University of Washington, Seattle, WA 98195, USA 2 Dipartimento di Fisica, Università di Milano and INFN, Sezione di Milano, Via Celoria 16, I-20133 Milano, Italy 3 Department of Physics, Tohoku University, Sendai 980–8578, Japan We apply the time-dependent variational principle, the nuclear field ...

-Symmetric Cubic Anharmonic Oscillator as a Physical Model

We perform a perturbative calculation of the physical observables, in particular pseudoHermitian position and momentum operators, the equivalent Hermitian Hamiltonian operator, and the classical Hamiltonian for the PT -symmetric cubic anharmonic oscillator, H = 1 2mp 2+ 1 2μ 2x2+iǫx3. Ignoring terms of order ǫ4 and higher, we show that this system describes an ordinary quartic anharmonic oscill...

Polaron dynamics in a two-dimensional anharmonic Holstein model

A Hierarchical Model of Quantum Anharmonic Oscillators: Critical Point Convergence

A hierarchical model of interacting quantum particles performing anharmonic oscillations is studied in the Euclidean approach, in which the local Gibbs states are constructed as measures on infinite dimensional spaces. The local states restricted to the subalgebra generated by fluctuations of displacements of particles are in the center of the study. They are described by means of the correspon...

Sodium superionic conduction in Na2B12H12.

Impedance measurements indicate that Na2B12H12 exhibits dramatic Na(+) conductivity (on the order of 0.1 S cm(-1)) above its order-disorder phase-transition at ≈529 K, rivaling that of current, solid-state, ceramic-based, Na-battery electrolytes. Superionicity may be aided by the large size, quasispherical shape, and high rotational mobility of the B12H12(2-) anions.