Results 61 to 70 of about 93,863 (276)

Quasiparticle Properties in Effective Field Theory [PDF]

, 2002
The quasiparticle concept is an important tool for the description of many-body systems. We study the quasiparticle properties for dilute Fermi systems with short-ranged, repulsive interactions using effective field theory.
Baker, Baker, Beane, Bedaque, Bedaque, Bedaque, Bernard, Bishop, Braaten, Braaten, Bund, DeMarco, Efimov, Fetter, Furnstahl, Furnstahl, Galitskii, Gasser, H.-W. Hammer, Hammer, Kaplan, Kaplan, L. Platter, Landau, Landau, Landau, Lepage, Lepage, Luttinger, Meißner, Migdal, Negele, Nozieres, Sartor, Steele, Truscott, U.-G. Meißner, van Kolck, Weinberg   +38 more
core   +2 more sources

Marche au hasard d’une quasi-particule massive dans le gaz de phonons d’un superfluide à très basse température

Comptes Rendus. Physique, 2021
We consider in dimension 3 a homogeneous superfluid at very low temperature $T$ having two types of excitations, (i) gapless acoustic phonons with a linear dispersion relation at low wave number, and (ii) gapped $\gamma $ quasiparticles with a quadratic (
Castin, Yvan
doaj   +1 more source

Quasiparticle Dynamics in the Kondo Lattice Model at Half Filling

, 2005
We study spectral properties of quasiparticles in the Kondo lattice model in one and two dimensions including the coherent quasiparticle dispersions, their spectral weights and the full two-quasiparticle spectrum using a cluster expansion scheme.
Axel Grzesik, C. Domb, C. Knetter, Hartmut Monien, I. Milat, Manfred Sigrist, Simon Trebst   +6 more
core   +1 more source

Quasiparticle properties of a coupled quantum wire electron-phonon system [PDF]

, 1996
We study leading-order many-body effects of longitudinal optical (LO) phonons on electronic properties of one-dimensional quantum wire systems. We calculate the quasiparticle properties of a weakly polar one dimensional electron gas in the presence of ...
A. F. Levi, A. R. Goñi, A. S. Plaut, Ben Yu-Kuang Hu, D. Gershoni, E. H. Hwang, E. H. Hwang, E. Kapon, E. S. Hellman, F. A. Riddoch, G. Mahan, H. L. Stormer, J. J. Quinn, J. M. Calleja, J. S. Wiener, K. Kash, L. Hedin, L. Hedin, L. Pfeiffer, M. E. Kim, M. Heiblum, M. Heiblum, M. Heiblum, M. Tsuchiya, N. D. Mermin, N. Yokoyama, Q. P. Li, Q. P. Li, R. Cingolani, R. Jalabert, R. Nötzel, S. Das Sarma, S. Das Sarma, S. Das Sarma, S. Das Sarma, T. Ando, U. Sivan   +36 more
core   +3 more sources

BerkeleyGW: A massively parallel computer package for the calculation of the quasiparticle and optical properties of materials and nanostructures [PDF]

Computer Physics Communications, 2011
BerkeleyGW is a massively parallel computational package for electron excited-state properties that is based on the many-body perturbation theory employing the ab initio GW and GW plus Bethe–Salpeter equation methodology.
J. Deslippe, G. Samsonidze, David A. Strubbe, Manish Jain, M. Cohen, S. Louie   +5 more
semanticscholar   +1 more source

Observation of Two‐Photon Resonant Raman Scattering via the Biexciton Level in Two‐Dimensional Halide Perovskite (C6H5C2H4NH3)2PbI4

Advanced Functional Materials, EarlyView.
Efficient two‐photon resonant Raman scattering (TRRS) is observed in the layered perovskite (PEA)2PbI4, with the biexciton level acting as an intermediate state. TRRS undergoes two‐photon frequency shift upon input frequency tuning, persists up to 90 K, and shows clear threshold behavior and polarization selection rules.
Seung Han Shin, Seo Hyun Nam, Jeehong Park, Dong Gyu Lee, Jeong Bin Cho, Tae Jung Kim, Yeonjin Yi, Joon Ik Jang   +7 more
wiley   +1 more source

Quasiparticle anisotropy and pseudogap formation from the weak-coupling renormalization group point of view

, 2004
Using the one-loop functional renormalization group technique we evaluate the self-energy in the weak-coupling regime of the 2D t-t' Hubbard model. At van Hove (vH) band fillings and at low temperatures the quasiparticle weight along the Fermi surface ...
A. A. Katanin, A. P. Kampf, C. Honerkamp, H. J. Vidberg, M. Salmhofer   +4 more
core   +1 more source

Cubic scaling G W : Towards fast quasiparticle calculations [PDF]

, 2016
Within the framework of the full potential projector-augmented wave methodology, we present a promising low-scaling $GW$ implementation. It allows for quasiparticle calculations with a scaling that is cubic in the system size and linear in the number of $
Peitao Liu, M. Kaltak, Jivr'i Klimevs, G. Kresse   +3 more
semanticscholar   +1 more source

Microscopic Insights into Magnetic Warping and Time‐Reversal Symmetry Breaking in Topological Surface States of Rare‐Earth‐Doped Bi2Te3

Advanced Materials, EarlyView.
Magnetic doping of the topological insulator Bi2Te3 with erbium adatoms induces out‐of‐plane magnetism and breaks time‐reversal symmetry, opening a Dirac gap and driving a Fermi surface transition from hexagonal to star‐of‐David geometry. Microscopy, spectroscopy, and magnetic dichroism reveal atomically controlled magnetic interactions that tailor the
Beatriz Muñiz Cano, Fabián Calleja, Ji Dai, Massimo Tallarida, Vera Marinova, Alessandro Barla, Marc G. Cuxart, Pierluigi Gargiani, Gonzalo N. Molina, José Angel Silva‐Guillén, Adriana I. Figueroa, Kevin García‐Díez, Sergio O. Valenzuela, Aitor Mugarza, Amadeo L. Vázquez de Parga, Rodolfo Miranda, Francisco Guinea, Manuela Garnica, Miguel A. Valbuena   +18 more
wiley   +1 more source

Skyrmion number for a generalized vector Poincaré beam

Компьютерная оптика
We investigate two initial vector Poincaré-type light fields that can be treated as optical skyrmions – topological quasiparticles. For such fields, explicit expressions are obtained for the components of a 3D-vector skyrmionic field in the initial plane
V.V. Kotlyar, A.A. Kovalev , A.M. Telegin   +2 more
doaj   +1 more source