Zobrazeno 1 - 10
of 287
pro vyhledávání: '"Berciu, Mona"'
We use density matrix renormalization group (DMRG) and variational exact diagonalization (VED) to calculate the single-electron removal spectral weight for the Hubbard-Holstein model at low electron densities. Tuning the strength of the electron-phon
Externí odkaz:
http://arxiv.org/abs/2409.14490
The polarizability of nearby ions may have a significant impact on electron interactions in solids, but only limited experimental data are available to support this picture. In this work, using a highly simplified description of the prototypical FeAs
Externí odkaz:
http://arxiv.org/abs/2408.12707
Publikováno v:
Phys. Rev. B 109, 144523 (2024)
Feasibility of accurate quantum calculations is often restricted by the dimensionality of the truncated Hilbert space required for the numerical computations. The present work demonstrates Bayesian machine learning (ML) models that use quantum proper
Externí odkaz:
http://arxiv.org/abs/2312.09991
Autor:
Zhang, Zhuoming, Ghonge, Sushrut, Ding, Yang, Zhang, Shubin, Berciu, Mona, Schaller, Richard D., Jankó, Boldizsár, Kuno, Masaru
Publikováno v:
ACS Nano 18, 8, 6438 - 6444 (2024)
Lead-halide perovskite nanocrystals such as CsPbBr$_3$, exhibit efficient photoluminescence (PL) up-conversion, also referred to as anti-Stokes photoluminescence (ASPL). This is a phenomenon where irradiating nanocrystals up to 100 meV below gap resu
Externí odkaz:
http://arxiv.org/abs/2308.04363
Autor:
Nocera, Alberto, Berciu, Mona
Publikováno v:
SciPost Phys. 15, 110 (2023)
Spectral functions are important quantities that contain a wealth of information about the quasiparticles of a system, and that can also be measured experimentally. For systems with electron-phonon coupling, good approximations for the spectral funct
Externí odkaz:
http://arxiv.org/abs/2303.05013
We provide an intuitive understanding of the collective low-energy spin excitation of the one-dimensional spin-1/2 antiferromagnetic Heisenberg chain, known as the spinon. To this end, we demonstrate how a single spinon can be excited by adding one e
Externí odkaz:
http://arxiv.org/abs/2303.02276
It is well known that phonons can overscreen the bare Coulomb electron-electron repulsion, turning it into the effective attraction that binds the Cooper pairs responsible for BCS superconductivity. Here, we use a simple lattice model to prove that t
Externí odkaz:
http://arxiv.org/abs/2301.03530
Autor:
Carbone, Matthew R., Fomichev, Stepan, Millis, Andrew J., Berciu, Mona, Reichman, David R., Sous, John
Publikováno v:
J. Open Source Softw. 8, 5115 (2023)
We present an efficient implementation of the Generalized Green's function Cluster Expansion (GGCE), which is a new method for computing the ground-state properties and dynamics of polarons (single electrons coupled to lattice vibrations) in model el
Externí odkaz:
http://arxiv.org/abs/2210.12260
Motivated by the recent X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) experiments, we use a detailed impurity model to explore the nature of the parent compound and hole doped states of (La, Nd, Pr)NiO$_2$ by incl
Externí odkaz:
http://arxiv.org/abs/2208.04562
We investigate the difference between the coupling of a bare carrier to phonons versus the coupling of a correlations-dressed quasiparticle to phonons, and show that latter may be weak even if the former is strong. Specifically, we analyze the effect
Externí odkaz:
http://arxiv.org/abs/2205.06909