2012/06/01 by G. De Filippis, V. Cataudella, E. A. Nowadnick +7 · 2 citations
Chemistry · Materials Science · Physics and Astronomy · #Atomic physics #Chemistry #Condensed matter physics #Hubbard model #Non-equilibrium thermodynamics #Organic and Molecular Conductors Research #Oscillation (cell signaling) #Phonon #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum and electron transport phenomena #Quantum mechanics #Relaxation (psychology) #Superconductivity #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.109.176402
published as Phys. Rev. Lett. 109, 176402 (2012) · 4 pages, 4 figures
arxiv created 2012/06/01 · openalex publication_date 2012/10/23 · arxiv updated 2015/06/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The spectral response and physical features of the 2D Hubbard-Holstein model are calculated both in equilibrium at zero and low chemical dopings, and after an ultrashort powerful light pulse, in undoped systems. At equilibrium and at strong charge-lattice couplings, the optical conductivity reveals a three-peak structure in agreement with experimental observations. After an ultrashort pulse and at nonzero electron-phonon interaction, phonon and spin subsystems oscillate with the phonon period T(ph)≈80 fs. The decay time of the phonon oscillations is about 150-200 fs, similar to the relaxation time of the charge system. We propose a criterion for observing these oscillations in high T(c) compounds: the time span of the pump light pulse τ(pump) has to be shorter than the phonon oscillation period T(ph).