Diffusive dynamics of fractionalized particles and the enhanced conductivity at the border of the neutral-ionic transition

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Detalles Bibliográficos
Autores principales:	Sakai, Yuta, Hotta, Chisa
Formato:	Preprint
Publicado:	2024
Materias:	Other Condensed Matter Strongly Correlated Electrons
Acceso en línea:	Acceder al recurso
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_version_	1866913536923402240
author	Sakai, Yuta Hotta, Chisa
author_facet	Sakai, Yuta Hotta, Chisa
contents	We study the diffusive dynamics of the classical one-dimensional lattice model of mobile particles featuring the incoherent metallic state of the organic TTF-CA found in the vicinity of the neutral-ionic(NI)-transition. The particles are strongly correlated and feel the alternating site potentials, exhibiting uniform ionic (I) Mott insulating and neutral band insulating (N) phases when the Coulomb interaction and site potentials are large, respectively. We focus on the neutral-ionic domain walls (NIDW) activated by their competition, which is typically regarded as fractionalized particles. The finite temperature phase diagram reveals a thermodynamically stable NIDW phase not found in previous literature that emerges at the triple point, where the transition line splits into two first-order lines toward the critical endpoints. We analyze the long-time behavior of dynamics of the NIDWs and find that it captures the diffusive transport of the system. The conductivity derived from the diffusion constant and the number population of NIDWs shows a strong enhancement inside the NIDW phase, which can explain the large conductivity at the NI crossover found in TTF-CA.
format	Preprint
id	arxiv_https___arxiv_org_abs_2407_03679
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Diffusive dynamics of fractionalized particles and the enhanced conductivity at the border of the neutral-ionic transition Sakai, Yuta Hotta, Chisa Other Condensed Matter Strongly Correlated Electrons We study the diffusive dynamics of the classical one-dimensional lattice model of mobile particles featuring the incoherent metallic state of the organic TTF-CA found in the vicinity of the neutral-ionic(NI)-transition. The particles are strongly correlated and feel the alternating site potentials, exhibiting uniform ionic (I) Mott insulating and neutral band insulating (N) phases when the Coulomb interaction and site potentials are large, respectively. We focus on the neutral-ionic domain walls (NIDW) activated by their competition, which is typically regarded as fractionalized particles. The finite temperature phase diagram reveals a thermodynamically stable NIDW phase not found in previous literature that emerges at the triple point, where the transition line splits into two first-order lines toward the critical endpoints. We analyze the long-time behavior of dynamics of the NIDWs and find that it captures the diffusive transport of the system. The conductivity derived from the diffusion constant and the number population of NIDWs shows a strong enhancement inside the NIDW phase, which can explain the large conductivity at the NI crossover found in TTF-CA.
title	Diffusive dynamics of fractionalized particles and the enhanced conductivity at the border of the neutral-ionic transition
topic	Other Condensed Matter Strongly Correlated Electrons
url	https://arxiv.org/abs/2407.03679

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