Phonon-mediated repulsion, sharp transitions and (quasi)self-trapping in the extended Peierls-Hubbard model

Abstract We study two identical fermions, or two hard-core bosons, in an infinite chain and coupled to phonons by interactions that modulate their hopping as described by the Peierls/Su-Schrieffer-Heeger (SSH) model. We show that exchange of phonons generates effective nearest-neighbor repulsion bet...

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Autores principales:	J. Sous, M. Chakraborty, C. P. J. Adolphs, R. V. Krems, M. Berciu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1a5e054c452c4f8799e987076ea9f3e1
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spelling	oai:doaj.org-article:1a5e054c452c4f8799e987076ea9f3e12021-12-02T11:40:44ZPhonon-mediated repulsion, sharp transitions and (quasi)self-trapping in the extended Peierls-Hubbard model10.1038/s41598-017-01228-y2045-2322https://doaj.org/article/1a5e054c452c4f8799e987076ea9f3e12017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01228-yhttps://doaj.org/toc/2045-2322Abstract We study two identical fermions, or two hard-core bosons, in an infinite chain and coupled to phonons by interactions that modulate their hopping as described by the Peierls/Su-Schrieffer-Heeger (SSH) model. We show that exchange of phonons generates effective nearest-neighbor repulsion between particles and also gives rise to interactions that move the pair as a whole. The two-polaron phase diagram exhibits two sharp transitions, leading to light dimers at strong coupling and the flattening of the dimer dispersion at some critical values of the parameters. This dimer (quasi)self-trapping occurs at coupling strengths where single polarons are mobile. This illustrates that, depending on the strength of the phonon-mediated interactions, the coupling to phonons may completely suppress or strongly enhance quantum transport of correlated particles.J. SousM. ChakrabortyC. P. J. AdolphsR. V. KremsM. BerciuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q J. Sous M. Chakraborty C. P. J. Adolphs R. V. Krems M. Berciu Phonon-mediated repulsion, sharp transitions and (quasi)self-trapping in the extended Peierls-Hubbard model
description	Abstract We study two identical fermions, or two hard-core bosons, in an infinite chain and coupled to phonons by interactions that modulate their hopping as described by the Peierls/Su-Schrieffer-Heeger (SSH) model. We show that exchange of phonons generates effective nearest-neighbor repulsion between particles and also gives rise to interactions that move the pair as a whole. The two-polaron phase diagram exhibits two sharp transitions, leading to light dimers at strong coupling and the flattening of the dimer dispersion at some critical values of the parameters. This dimer (quasi)self-trapping occurs at coupling strengths where single polarons are mobile. This illustrates that, depending on the strength of the phonon-mediated interactions, the coupling to phonons may completely suppress or strongly enhance quantum transport of correlated particles.
format	article
author	J. Sous M. Chakraborty C. P. J. Adolphs R. V. Krems M. Berciu
author_facet	J. Sous M. Chakraborty C. P. J. Adolphs R. V. Krems M. Berciu
author_sort	J. Sous
title	Phonon-mediated repulsion, sharp transitions and (quasi)self-trapping in the extended Peierls-Hubbard model
title_short	Phonon-mediated repulsion, sharp transitions and (quasi)self-trapping in the extended Peierls-Hubbard model
title_full	Phonon-mediated repulsion, sharp transitions and (quasi)self-trapping in the extended Peierls-Hubbard model
title_fullStr	Phonon-mediated repulsion, sharp transitions and (quasi)self-trapping in the extended Peierls-Hubbard model
title_full_unstemmed	Phonon-mediated repulsion, sharp transitions and (quasi)self-trapping in the extended Peierls-Hubbard model
title_sort	phonon-mediated repulsion, sharp transitions and (quasi)self-trapping in the extended peierls-hubbard model
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/1a5e054c452c4f8799e987076ea9f3e1
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Phonon-mediated repulsion, sharp transitions and (quasi)self-trapping in the extended Peierls-Hubbard model

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