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Light bipolarons in a system of electrons coupled to dispersive optical phonons
ID
Kovač, Klemen
(
Author
),
ID
Bonča, Janez
(
Author
)
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https://journals.aps.org/prb/abstract/10.1103/PhysRevB.109.064304
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Abstract
We investigate the ground-state properties of the bipolaron coupled to quantum dispersive optical phonons in the one-dimensional Holstein-Hubbard model. We concentrate on the interplay between the phonon dispersion and the Coulomb repulsion and their mutual effect on the bipolaron effective mass, the binding energy, and the phase diagram. Most surprisingly, the sign of the curvature of the optical phonon dispersion plays a decisive role in the bipolaron binding energy in the presence of the Coulomb repulsion $U$. In particular, when the sign of the phonon dispersion curvature matches the sign of the electron dispersion curvature, the bipolaron remains bound in the strong-coupling limit even when $U \to \infty$ and the binding emanates from the exchange of phonons between two electrons residing on adjacent sites. At moderate electron-phonon coupling a light bipolaron exists up to large values of $U$. Finally, an intuitive explanation of the role of the phonon dispersion on the bipolaron binding energy is derived using the strong-coupling limit where the binding emanates from the exchange of phonons between two electrons residing on adjacent sites which leads to enhanced stability of bipolarons at elevated Coulomb repulsion.
Language:
English
Keywords:
bipolaronic systems
,
phonons
,
phononic dispersion
,
electron-phonon interaction
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FMF - Faculty of Mathematics and Physics
Publication version:
Author Accepted Manuscript
Publication date:
12.02.2024
Year:
2024
Number of pages:
Str. 064304-1-064304-8
Numbering:
Vol. 109, iss. 6, [article no.] 064304
PID:
20.500.12556/RUL-154891
UDC:
53
ISSN on article:
2469-9969
DOI:
10.1103/PhysRevB.109.064304
COBISS.SI-ID:
185285123
Publication date in RUL:
07.03.2024
Views:
356
Downloads:
37
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Record is a part of a journal
Title:
Physical review
Shortened title:
Phys. rev. B.
Publisher:
American Physical Society
ISSN:
2469-9969
COBISS.SI-ID:
3042148
Licences
License:
CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:
The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Projects
Funder:
ARIS - Slovenian Research and Innovation Agency
Project number:
P1-0044
Name:
Teorija trdnih snovi in statistična fizika
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