Service interruption on Monday 11 July from 12:30 to 13:00: all the sites of the CCSD (HAL, Epiciences, SciencesConf, AureHAL) will be inaccessible (network hardware connection).
Skip to Main content Skip to Navigation
Journal articles

Unraveling the excitation spectrum of many-body systems from quantum quenches

Abstract : Quenches are now routinely used in synthetic quantum systems to study a variety of fundamental effects, including ergodicity breaking, light-cone-like spreading of information, and dynamical phase transitions. It was shown recently that the dynamics of equal-time correlators may be related to ground-state phase transitions and some properties of the system excitations. Here, we show that the full low-lying excitation spectrum of a generic many-body quantum system can be extracted from the after-quench dynamics of equal-time correlators. We demonstrate it for a variety of one-dimensional lattice models amenable to exact numerical calculations, including Bose and spin models, with short-or long-range interactions. The approach also applies to higher dimensions, correlated fermions, and continuous models. We argue that it provides an alternative approach to standard pump-probe spectroscopic methods and discuss its advantages.
Complete list of metadata

Cited literature [81 references]  Display  Hide  Download

https://hal-polytechnique.archives-ouvertes.fr/hal-02434166
Contributor : Louis Villa Connect in order to contact the contributor
Submitted on : Thursday, January 9, 2020 - 5:25:22 PM
Last modification on : Wednesday, November 3, 2021 - 6:58:56 AM
Long-term archiving on: : Saturday, April 11, 2020 - 11:26:22 AM

File

paper+SM_QSF.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Louis Villa, Julien Despres, Laurent Sanchez-Palencia. Unraveling the excitation spectrum of many-body systems from quantum quenches. Physical Review A, American Physical Society 2019, 100 (6), ⟨10.1103/PhysRevA.100.063632⟩. ⟨hal-02434166⟩

Share

Metrics

Record views

40

Files downloads

76