Spectral functions and critical dynamics of the O(4) model from classical-statistical lattice simulations
Sign Up to like & getrecommendations! 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
Verification and validation of zero-point electron-phonon renormalization of the bandgap, mass enhancement, and spectral functions
Sign Up to like & getrecommendations! Published in 2024 at "npj Computational Materials"
DOI: 10.1038/s41524-025-01587-5
Abstract: Verification and validation of methods and first-principles software are at the core of computational solid-state physics but are too rarely addressed. We compare four first-principles codes: ABINIT, Quantum ESPRESSO, EPW, ZG, and three methods: (i)… read more here.
Keywords: phonon; verification validation; electron phonon; mass enhancement ... See more keywords
Reconstruction of smeared spectral functions from Euclidean correlation functions
Sign Up to like & getrecommendations! 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
Photon and phonon spectral functions for continuum quantum optomechanics
Sign Up to like & getrecommendations! 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
Spectral functions with infinite projected entangled-pair states
Sign Up to like & getrecommendations! Published in 2024 at "Physical Review B"
DOI: 10.1103/physrevb.110.094314
Abstract: Infinite projected entangled-pair states (iPEPS) provide a powerful tool to study two-dimensional strongly correlated systems directly in the thermodynamic limit. In this work, we extend the iPEPS toolbox by a method to efficiently evaluate non-equal… read more here.
Keywords: pair states; entangled pair; infinite projected; spectral functions ... See more keywords
Virtual photon polarization in ultrarelativistic heavy-ion collisions
Sign Up to like & getrecommendations! 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
Two-loop thermal spectral functions with general kinematics
Sign Up to like & getrecommendations! 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
Topological Spin Excitations in Non-Hermitian Spin Chains with a Generalized Kernel Polynomial Algorithm.
Sign Up to like & getrecommendations! 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
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
Sign Up to like & getrecommendations! 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
Estimation of bispectral characteristics of fluorescent objects based on multispectral imaging data
Sign Up to like & getrecommendations! 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