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Transition of a small-bipolaron gas to a Frohlich polaron in a deformable lattice

Hettiarachchi, Gayan Prasad and Mohd. Muhid, Mohd. Nazlan and Hamdan, Halimaton (2018) Transition of a small-bipolaron gas to a Frohlich polaron in a deformable lattice. Physical Review B, 97 (15). p. 155142. ISSN 2469-9950

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Official URL: http://dx.doi.org/10.1103/PhysRevB.97.155142


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 Fröhlich polaron reveals an important part of the complex phase diagram of the metal-insulator transition in a deformable lattice.

Item Type:Article
Uncontrolled Keywords:deformable lattice, small bipolaron
Subjects:Q Science > QD Chemistry
ID Code:85472
Deposited By: Widya Wahid
Deposited On:30 Jun 2020 16:45
Last Modified:30 Jun 2020 16:45

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