Transition of a small-bipolaron gas to a Fröhlich polaron in a deformable lattice
| Autor: | Mohd Nazlan Mohd Muhid, Gayan Prasad Hettiarachchi, Halimaton Hamdan |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Phase transition Bipolaron Condensed matter physics Sideband 02 engineering and technology 021001 nanoscience & nanotechnology Polaron 01 natural sciences Mass enhancement Metal Lattice (order) visual_art 0103 physical sciences visual_art.visual_art_medium Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Phase diagram |
| Zdroj: | Physical Review B. 97 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.97.155142 |
| Popis: | The electronic properties of guest Cs atoms in a deformable lattice are investigated at various densities $n$. Low values of $n$ show optical absorptions of small bipolarons. At intermediate $n$ values, new bands appear in the midinfrared (MIR) and high-frequency regions, which coexist with the small bipolaron bands. With a further increase in $n$, the small bipolaron bands become less discernible and subsequently disappear, resulting in the appearance of a Drude component superimposed on a MIR sideband suggesting a phase transition to a polaronic metal. In this itinerant phase, an approximately twofold mass enhancement is observed. This continuous transition of a gas of small bipolarons to a polaronic metal characterized by a Fr\"ohlich polaron reveals an important part of the complex phase diagram of the metal-insulator transition in a deformable lattice. |
| Databáze: | OpenAIRE |
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