Saved in:
| Main Authors: | , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2502.10692 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Table of Contents:
- The theoretical study of instabilities, thermal fluctuations, and topological defects in the crystal-rotator-I-rotator-II ($X-R_{I}-R_{II}$) phase transitions of n-alkanes has been conducted. First, we examine the nature of the $R_{I}-R_{II}$ phase transition in nanoconfined alkanes. We propose that under confined conditions, the presence of quenched random orientational disorder makes the $R_{I}$ phase unstable. This disorder-mediated transition falls within the Imry-Ma universality class. Next, we discuss the role of thermal fluctuations in certain rotator phases, as well as the influence of dislocations on the $X-R_I$ phase transition. Our findings indicate that the Herringbone order in the $X$-phase and the Hexatic order in the $R_{II}$-phase exhibit quasi-long-range characteristics. Furthermore, we find that in two dimensions, the unbinding of dislocations does not result in a disordered liquid state.