Institute of Experimental Physics
Topic
Study of phase coherence and energy dissipation processes in piezo-resonators
PhD. program
Condensed matter physics
Year of admission
2025
Name of the supervisor
RNDr. Marcel Človečko, PhD.
Contact:
Receiving school
Faculty of Science, P.J. Safarik University
Annotation
This dissertation is focused on a study of the transition of piezo-mechanical resonators to the coherent state. There are experimental indications that these resonators belong to physical systems with so-called phase coherence. Previous studies of SiO2-based piezo-resonators have shown that, when cooled below 20 K, they transition to a state with a high Q-factor (quality factor) and, moreover, their resonant frequency measured at constant temperature (below 1 K) is extremely stable, comparable to the stability of commercial gas (CO2) lasers. The main aim of the work will be to investigate the physical nature of the phase transition to the coherent state, to clarify the decoherence processes, to find out whether these piezoresonators exhibit the phenomenon of scaling of the frequency stability with the value of the resonant frequency, and to verify whether the above phase transition has a universal character, i.e. whether it is observable in other classes of piezoelectric materials (e.g. GaPO4, etc.).