Possible insulator-pseudogap crossover in the attractive Hubbard model on the Lieb lattice

Kukka-Emilia Huhtinen; Päivi Törmä

doi:10.1103/PhysRevB.103.L220502

Possible insulator-pseudogap crossover in the attractive Hubbard model on the Lieb lattice

Kukka-Emilia Huhtinen, Päivi Törmä

Tutkimustuotos: Lehtiartikkeli › Article › Scientific › vertaisarvioitu

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Abstrakti

We study the attractive Hubbard model on the Lieb lattice to understand the normal state above the superconducting critical temperature in a flat band system. We use cluster dynamical mean-field theory to compute the two-particle susceptibilities with full quantum fluctuations included in the cluster. At interaction strengths lower than the hopping amplitude, we find that the normal state on the flat band shows insulating behavior stemming from the localization properties of the flat band. A flat-band enhanced pseudogap with a depleted spectral function arises at larger interactions.

Alkuperäiskieli	Englanti
Artikkeli	L220502
Sivumäärä	6
Julkaisu	Physical Review B
Vuosikerta	103
Numero	22
DOI - pysyväislinkit	https://doi.org/10.1103/PhysRevB.103.L220502
Tila	Julkaistu - 1 kesäk. 2021
OKM-julkaisutyyppi	A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Pääsy asiakirjaan

10.1103/PhysRevB.103.L220502

PhysRevB.103.L220502Final published version, 572 KB

https://arxiv.org/abs/2007.05118

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Pitkän kantaman koherenssi nanosysteemeissä
Törmä, P., Arjas, K., Julku, A., Kliuiev, P., Pyykkönen, V., Salerno, G., Topp, G., Moilanen, A., Kumar, P., Lamponen, E., Aronen, K. & Luntama, S.
01/01/2020 → 31/12/2021
Projekti: Academy of Finland: Other research funding
Pitkän kantaman koherenssi nanosysteemeissä
Törmä, P.
01/01/2017 → 31/12/2021
Projekti: Academy of Finland: Other research funding
Pitkän kantaman koherenssi nanosysteemeissä
Törmä, P., Arjas, K., Kliuiev, P., Vanhala, T., Liang, L., Moilanen, A., Tylutki, M., Huhtinen, K., Nečada, M., Daskalakis, K., Kumar, P., Pyykkönen, V., Guo, R. & Peotta, S.
01/01/2017 → 31/12/2019
Projekti: Academy of Finland: Other research funding

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abstract = "We study the attractive Hubbard model on the Lieb lattice to understand the normal state above the superconducting critical temperature in a flat band system. We use cluster dynamical mean-field theory to compute the two-particle susceptibilities with full quantum fluctuations included in the cluster. At interaction strengths lower than the hopping amplitude, we find that the normal state on the flat band shows insulating behavior stemming from the localization properties of the flat band. A flat-band enhanced pseudogap with a depleted spectral function arises at larger interactions.",

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Possible insulator-pseudogap crossover in the attractive Hubbard model on the Lieb lattice

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