Class of variational Ansätze for the spin-incoherent ground state of a Luttinger liquid coupled to a spin bath

Soltanieh-ha, Mohammad; Feiguin, Adrian

doi:10.1103/physrevb.86.205120

Cited by 5 publications

(3 citation statements)

References 42 publications

(35 reference statements)

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“…Breakdown of Landau Fermi liquid (FL) theory is an important topic in the experimental and theoretical investigations of correlated electronic systems [1][2][3][4][5]. Non-Fermi liquid (NFL) behavior has been widely observed in several categories of strongly correlated metals, including heavy fermion (HF) metals [1,2,4,6,7], high temperature superconductors [3,[8][9][10][11], low dimensional compounds [12][13][14] and itinerant magnets (IMs) [2][3][4][15][16][17]. These NFL systems show unusual temper ature dependence in their physical properties at low temperature, including anomalous temperature dependence of resistivity, diverging specific heat coefficient and anomalous Curie-Weiss law of susceptibility.…”

Section: Introductionmentioning

confidence: 99%

Disorder-driven non-Fermi liquid behavior in itinerant ferromagnet α-Co₅Ge₃

Song

Xian

Wang

et al. 2020

J. Phys.: Condens. Matter

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The physical properties of itinerant ferromagnet α-Co 5 Ge 3 with both strong disorder and spin fluctuations was studied. The dc and ac susceptibility show that both spin fluctuations and disorder dominate the physical properties. In the spin glass phase, with a coexisting ferromagnetic state ( 30 K), both non-Fermi liquid behavior and large exponent of scaling relation of ρ A xy ∝ ρ 6.9 xx are observed and attributed to the spin fluctuations and disorder induced by cobalt defects. Upon the increase of external field, Fermi liquid behavior restores due to the suppression of spin fluctuations and disorder. In addition, a large anomalous Hall coefficient R s is observed. Our results suggest that α-Co 5 Ge 3 is a typical itinerant ferromagnet to explore the interplay of disorder and spin fluctuations.

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Section: Introductionmentioning

confidence: 99%

Disorder-driven non-Fermi liquid behavior in itinerant ferromagnet α-Co₅Ge₃

Song

Xian

Wang

et al. 2020

J. Phys.: Condens. Matter

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“…While much theoretical work has focused on single-band problems, a rich phenomenology can occur in more realistic multi-orbital cases, where besides Coulomb interactions, Hund physics plays an important role. Amongst other important correlation-driven phenomena one could cite orbital selective Mott transitions [23][24][25][26] , spin-orbital separation 21,[27][28][29][30] , spin-incoherent behavior 31,32 , and pair density waves [33][34][35] .…”

Section: Introductionmentioning

confidence: 99%

Excitonic density waves, biexcitons, and orbital-selective pairing in two-orbital correlated chains

Yang

Feiguin

2018

Phys. Rev. B

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We present a comprehensive study of a one-dimensional two-orbital model at and below quarterfilling that realizes a number of unconventional phases. In particular, we find an excitonic density wave in which excitons quasi-condense with finite center of mass momentum and an order parameter that changes phase with wave-vector Q. In this phase, excitons behave as hard-core bosons without charge order. In addition, excitons can pair to form bi-excitons in a state that is close to a charge density-wave instability. When pairing dominates over the inter-orbital repulsion, we encounter a regime in which one orbital is metallic, while the other forms a spin gapped superconductor, a genuine orbital selective paired state. All these results are supported by both, analytical and numerical calculations. By assuming a quasi-classical approximation, we solve the three-body holeelectron-spinon problem and show that excitons are held together by forming a bound state with spinons. In order to preserve the antiferromagnetic background, excitons acquire a dispersion that has a minimum away from k = 0. The full characterization of the different phases is obtained by means of extensive density matrix renormalization group calculations.

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“…Interestingly, it was also shown that a coupling to a spin bath can have a similar effect as temperature, but only in the ground-state. 14,15 .…”

Section: Introductionmentioning

confidence: 99%

Spectral function of theU→∞one-dimensional Hubbard model at finite temperature and the crossover to the spin-incoherent regime

Soltanieh-ha

Feiguin

2014

Phys. Rev. B

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The physics of the strongly interacting Hubbard chain (with t/U 1) at finite temperatures undergoes a crossover to a spin incoherent regime when the temperature is very small relative to the Fermi energy, but larger than the characteristic spin energy scale. This crossover can be understood by means of Ogata and Shiba's factorized wave function, where charge and spin are totally decoupled, and assuming that the charge remains in the ground state, while the spin is thermally excited and at an effective "spin temperature". We use the time-dependent density matrix renormalization group method (tDMRG) to calculate the dynamical contributions of the spin, to reconstruct the single-particle spectral function of the electrons. The crossover is characterized by a redistribution of spectral weight both in frequency and momentum, with an apparent shift by kF of the minimum of the dispersion.

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Class of variational Ansätze for the spin-incoherent ground state of a Luttinger liquid coupled to a spin bath

Cited by 5 publications

References 42 publications

Disorder-driven non-Fermi liquid behavior in itinerant ferromagnet α-Co₅Ge₃

Disorder-driven non-Fermi liquid behavior in itinerant ferromagnet α-Co₅Ge₃

Excitonic density waves, biexcitons, and orbital-selective pairing in two-orbital correlated chains

Spectral function of theU→∞one-dimensional Hubbard model at finite temperature and the crossover to the spin-incoherent regime

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Class of variational Ansätze for the spin-incoherent ground state of a Luttinger liquid coupled to a spin bath

Cited by 5 publications

References 42 publications

Disorder-driven non-Fermi liquid behavior in itinerant ferromagnet α-Co5Ge3

Disorder-driven non-Fermi liquid behavior in itinerant ferromagnet α-Co5Ge3

Excitonic density waves, biexcitons, and orbital-selective pairing in two-orbital correlated chains

Spectral function of theU→∞one-dimensional Hubbard model at finite temperature and the crossover to the spin-incoherent regime

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About

Disorder-driven non-Fermi liquid behavior in itinerant ferromagnet α-Co₅Ge₃

Disorder-driven non-Fermi liquid behavior in itinerant ferromagnet α-Co₅Ge₃