تقرير
A dynamical approach to the $\alpha$-$\beta$ displacive transition of quartz
| العنوان: | A dynamical approach to the $\alpha$-$\beta$ displacive transition of quartz |
|---|---|
| المؤلفون: | Carati, Andrea, Gangemi, Fabrizio, Gangemi, Roberto, Galgani, Luigi |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Statistical Mechanics |
| الوصف: | General features of the $\alpha-\beta$ transition of quartz are investigated. Molecular dynamics methods are mainly used, an analytic treatment being deferred to a work in preparation. A basic preliminary observation is that the transition involves only a subsystem of four normal modes on which the remaining ones just act as a reservoir. The dynamics of the relevant subsystem turns out to be Hamiltonian, being governed by an effective potential that depends on the specific energy of the total system. The effective potential is actually calculated through time averages. It describes the transition as a pitchfork bifurcation, and also explains the phenomenon of the soft mode, since it exhibits a frequency that vanishes at the transition. The critical exponent too is estimated. Comment: 14 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2307.13411 |
| رقم الأكسشن: | edsarx.2307.13411 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |