Light-induced evaporative cooling of holes in the Hubbard model

Werner, Philipp; Eckstein, Martin; Müller, Markus; Refael, Gil

doi:10.1038/s41467-019-13557-9

Cited by 33 publications

(19 citation statements)

References 38 publications

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“…II B. Here, we show that this picture is related to the photodoping mechanism [35][36][37][38][39]. To this end, we introduce |φ α,η,ηz being a state for (η, η z )sector to decompose the photoexcited state |ψ(τ ) as…”

Section: Summary and Discussionmentioning

confidence: 88%

Photoinduced $η$ pairing in the Kondo lattice model

Shirakawa,

Miyakoshi,

Yunoki

2020

Preprint

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The previous theoretical study has shown that pulse irradiation to the Mott insulating state in the Hubbard model can induce the enhancement of superconducting correlation due to the generation of η pairs [Kaneko et. al., Phys. Rev. Lett. 122, 077002 (2019)]. Here, we show that the same mechanism can be applied to the Kondo lattice model, an effective model for heavy electron systems, by demonstrating that the pulse irradiation indeed enhances the η-pairing correlation. As in the case of the Hubbard model, the non-linear optical process is essential to increase the number of photoinduced η pairs and thus the enhancement of the superconducting correlation. We also find the diffusive behavior of the spin dynamics after the pulse irradiation, suggesting that the increase of the number of η pairs leads to the decoupling between the conduction band and the localized spins in the Kondo lattice model, which is inseparably related to the photodoping effect.

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Section: Summary and Discussionmentioning

confidence: 88%

Photoinduced $η$ pairing in the Kondo lattice model

Shirakawa,

Miyakoshi,

Yunoki

2020

Preprint

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“…This is substantially lower than the T = 1.42 of the thermalized state, but still high compared to the temperature scales of the equilibrium C phases. Entropy cooling [39] or the large susceptibility to orbital symmetry breaking in low-temperature states (see SM) can thus not fully explain the robustness of the hidden I,PM,C phase. Rather, the C order survives because the orbital symmetry-breaking allows the doublons/holons to move around and to optimize the kinetic energy.…”

Section: Resultsmentioning

confidence: 99%

Light-induced hidden odd-frequency order in a model for A$_3$C$_{60}$

Werner,

Murakami

2021

Preprint

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Laser driving in systems with competing or coupled electronic orders can lead to the enhancement of orders, or even to the appearance of hidden phases without an equilibrium analogue. Here we consider a model for A3C60 which exhibits a unique interplay between conventional and oddfrequency (or composite) orders. In particular, we show that photo-doping of the antiferromagnetic Mott insulating phase, as realized in Cs3C60, results in a paramagnetic gapped state with broken orbital symmetry. This hidden phase, which does not exist under equilibrium conditions, can be interpreted as an odd-frequency orbital-ordered state, and is conceptually related to the equilibrium Jahn-Teller metal in more weakly correlated compounds. Our study demonstrates the appearance of pure odd-frequency order via the nonthermal melting of magnetic order, and provides an interesting example of nonequilibrium control of electronic orders in a multi-orbital system.

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“…Such materials may thus be interesting playgrounds for "entropy cooling schemes." As was recently discussed in different contexts, the reshuffling of entropy between different subsystems (e.g., between different spatial regions [78], different orbitals [79], or electronic and spin sectors [80]) can result in a substantial cooling of quasiparticles, which may be a key concept to understand phenomena such as light-induced electronic orders [81,82].…”

Section: Discussionmentioning

confidence: 99%

Entropy and specific heat of the infinite-dimensional three-orbital Hubbard model

Yue

Werner

2020

Phys. Rev. B

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The Hund's coupling in multiorbital Hubbard systems induces spin freezing and associated Hund metal behavior. Using dynamical mean-field theory, we explore the effect of local moment formation, spin, and charge excitations on the entropy and specific heat of the three-orbital model. For fillings 2 n < 3 and low temperature, we demonstrate a substantial enhancement of the entropy in the spin-frozen metal phase to values comparable to the half-filled Mott insulator. We also discuss the appearance of entropy plateaus and peaks in the specific heat associated with the activation of spin and charge fluctuations at high temperature. The temperature scale for charge excitations is almost independent of filling and given by ≈0.2U , with U the intraorbital repulsion. Local spin excitations become relevant for filling n > 1 and their characteristic temperature is proportional to the Hund coupling J, with a filling-dependent prefactor. The analysis of the specific heat in the atomic limit yields accurate predictions for these features in the strong-coupling regime.

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Light-induced evaporative cooling of holes in the Hubbard model

Cited by 33 publications

References 38 publications

Photoinduced $η$ pairing in the Kondo lattice model

Photoinduced $η$ pairing in the Kondo lattice model

Light-induced hidden odd-frequency order in a model for A$_3$C$_{60}$

Entropy and specific heat of the infinite-dimensional three-orbital Hubbard model

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