Polaron catastrophe within quantum acoustics

• 成果类型: Article
• 署名作者: Aydin, Alhun; Keski-Rahkonen, Joonas; Graf, Anton M.; Yuan, Shaobing; Ouyang, Xiao-Yu; Muestecaplioglu, Ozguer E.; Heller, Eric J.
• 署名单位: Sabanci University; Harvard University; Harvard University; Princeton University; California Institute of Technology; Koc University
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-13565
• DOI: 10.1073/pnas.2426518122
• 发表日期: 2025-06-10
• 关键词: formal phase-transitions; intensity fluctuations; coherent states; excited-states; transport; DYNAMICS; light; interferometry; nonexistence; localization

摘要

The quantum acoustic framework has recently emerged as a nonperturbative, coherent approach to electron-lattice interactions, uncovering rich physics often obscured by perturbative methods with incoherent scattering events. Here, we model the strongly coupled dynamics of electrons and acoustic lattice vibrations within this framework, representing lattice vibrations as coherent states and electrons as quantum wave packets, in a manner distinctively different from tight-binding or discrete hopping-based approaches. We derive and numerically implement electron backaction on the lattice, providing both visual and quantitative insights into electron wave packet evolution and the formation of acoustic polarons. We investigate polaron binding energies across varying material parameters and compute key observables-including mean square displacement, kinetic energy, potential energy, and vibrational energy-over time. Our findings reveal the conditions that favor polaron formation, which is enhanced by low temperatures, high deformation potential constants, slow sound velocities, and high effective masses. Additionally, we explore the impact of external electric and magnetic fields, showing that while polaron formation remains robust under moderate fields, it is weakly suppressed at higher field strengths. These results deepen our understanding of polaron dynamics and pave the way for future studies into nontrivial transport behavior in quantum materials.