Articles with "spectral functions" as a keyword



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Spectral functions and critical dynamics of the O(4) model from classical-statistical lattice simulations

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Published in 2020 at "Nuclear Physics B"

DOI: 10.1016/j.nuclphysb.2019.114868

Abstract: We calculate spectral functions of the relativistic $O(4)$ model from real-time lattice simulations in classical-statistical field theory. While in the low and high temperature phase of the model, the spectral functions of longitudinal $(\sigma)$ and… read more here.

Keywords: lattice simulations; spectral functions; classical statistical; functions critical ... See more keywords
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Reconstruction of smeared spectral functions from Euclidean correlation functions

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Published in 2020 at "Progress of Theoretical and Experimental Physics"

DOI: 10.1093/ptep/ptaa044

Abstract: We propose a method to reconstruct smeared spectral functions from two-point correlation functions measured on the Euclidean lattice. An arbitrary smearing function can be considered as long as it is smooth enough to allow an… read more here.

Keywords: reconstruction smeared; spectral functions; correlation functions; functions euclidean ... See more keywords
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Photon and phonon spectral functions for continuum quantum optomechanics

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Published in 2020 at "Physical Review A"

DOI: 10.1103/physreva.101.043803

Abstract: We study many-particle phenomena of propagating multi-mode photons and phonons interacting through Brillouin scattering-type Hamiltonian in nanoscale waveguides. We derive photon and phonon retarded Green's functions and extract their spectral functions in applying the factorization… read more here.

Keywords: spectral functions; continuum quantum; photon phonon; quantum optomechanics ... See more keywords
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Virtual photon polarization in ultrarelativistic heavy-ion collisions

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Published in 2017 at "Physical Review C"

DOI: 10.1103/physrevc.95.044907

Abstract: The polarization of direct photons produced in an ultrarelativistic heavy-ion collision reflects the momentum anisotropy of the quark-gluon plasma created in the collision. This paper presents a general framework, based on the photon spectral functions… read more here.

Keywords: polarization; heavy ion; virtual photon; spectral functions ... See more keywords
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Two-loop thermal spectral functions with general kinematics

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Published in 2019 at "Physical Review D"

DOI: 10.1103/physrevd.100.116019

Abstract: Spectral functions at finite temperature and two-loop order are investigated, for a medium consisting of massless particles. We consider them in the timelike and spacelike domains, allowing the propagating particles to be any valid combination… read more here.

Keywords: spectral functions; loop thermal; two loop; thermal spectral ... See more keywords
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Topological Spin Excitations in Non-Hermitian Spin Chains with a Generalized Kernel Polynomial Algorithm.

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Published in 2022 at "Physical review letters"

DOI: 10.1103/physrevlett.130.100401

Abstract: Spectral functions of non-Hermitian Hamiltonians can reveal the existence of topologically nontrivial line gaps and the associated topological edge modes. However, the computation of spectral functions in a non-Hermitian many-body system remains an open challenge.… read more here.

Keywords: topology; many body; non hermitian; spectral functions ... See more keywords
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Nonlocal Coulomb correlations in pure and electron-doped Sr2IrO4: Spectral functions, Fermi surface, and pseudo-gap-like spectral weight distributions from oriented cluster dynamical mean-field theory

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Published in 2018 at "Physical Review Materials"

DOI: 10.1103/physrevmaterials.2.032001

Abstract: We address the role of non-local Coulomb correlations and short-range magnetic fluctuations in the high-temperature phase of Sr$_2$IrO$_4$ within state-of-the-art spectroscopic and first-principles theoretical methods. Introducing a novel cluster dynamical mean field scheme, we compute… read more here.

Keywords: dynamical mean; mean field; coulomb correlations; pseudo gap ... See more keywords
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Estimation of bispectral characteristics of fluorescent objects based on multispectral imaging data

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Published in 2021 at "Optical Engineering"

DOI: 10.1117/1.oe.60.3.033102

Abstract: Abstract. This paper proposes a method to estimate the bispectral characteristics of fluorescent objects by using multispectral imaging data. We suppose that an image acquisition system allows multiple illuminant projections to the object surface and… read more here.

Keywords: bispectral characteristics; multispectral imaging; excitation; spectral functions ... See more keywords