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Bose-Einstein condensation of self-trapping Fr¨ohlich bipolaron in lead methylammonium halide perovskite materials
by Shuang Han, Ran An, Wei Zhang, Yong Sun, Xin-Jun Ma, Xiu-Juan Miao, Xianglian, Pei-Fang Li, Tian-Ji Ou, Quan Zhuang, Cui-Lan Zhao, Zhao-Hua Ding and Jing-Lin Xiao
Submission summary
| Authors (as registered SciPost users): | Yong Sun |
| Submission information | |
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| Preprint Link: | scipost_202406_00039v1 (pdf) |
| Date submitted: | 2024-06-19 00:01 |
| Submitted by: | Sun, Yong |
| Submitted to: | SciPost Physics |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Computational, Phenomenological, Observational |
Abstract
Bosons can gather in large quantities under certain environmental conditions to produce macro scopic quantum phenomena, forming a new state of matter known as Bose-Einstein condensation. Some quasiparticles that exist in the quantum system also produce this physical phenomenon. Notably, the bipolaron is a composite quasi-particle comprised of two polarons, and the stability and related effects of the bipolaron state have long been the focus of research in various systems. This research uses Lee-Low-Pines unitary transformation, linear combination operator, and quantum statistical theory to explore the stability and temperature effect of strong coupling Fr¨ ohlich bipolarons in methylammonium lead halide perovskite materials. It is found that the stability of bipolarons is related to self-trapping energy and effective potential. The numerical results show that the vibration frequency of bipolarons can be changed by adjusting the confined strength of parabolic potential, which leads to the change of self-trapping energy. Furthermore, the internal relative motion coordinates of bipolarons influence effective potential energy. Finally, the relationship between related physical quantities and temperature is analyzed, and it is concluded that bipolarons are stable at absolute zero, and a large number of them gather, and Bose-Einstein condensation occurs, forming Bose-Einstein condensate. This research offers some insights for exploring the properties and effects of bipolarons in perovskite materials and a theoretical idea for a Bose-Einstein condensate of boson particles.
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