A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Exact Spectral Function of a Tonks-Girardeau Gas in a Lattice
Tekijät: Settino J, Lo Gullo Nicolino, Plastina F, Minguzzi A
Kustantaja: AMER PHYSICAL SOC
Julkaisuvuosi: 2021
Journal: Physical Review Letters
Tietokannassa oleva lehden nimi: PHYSICAL REVIEW LETTERS
Lehden akronyymi: PHYS REV LETT
Artikkelin numero: ARTN 065301
Vuosikerta: 126
Numero: 6
Sivujen määrä: 6
ISSN: 0031-9007
eISSN: 1079-7114
DOI: https://doi.org/10.1103/PhysRevLett.126.065301
Verkko-osoite: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.126.065301
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/53433900
The single-particle spectral function of a strongly correlated system is an essential ingredient to describe its dynamics and transport properties. We develop a method to evaluate exactly the spectral function for a gas of one-dimensional bosons with infinitely strong repulsions valid for any type of external confinement. Focusing on the case of a lattice confinement, we find that the spectral function displays three main singularity lines. One of them is due uniquely to lattice effects, while the two others correspond to the Lieb-I and Lieb-II modes occurring in a uniform fluid. Differently from the dynamical structure factor, in the spectral function the Lieb-II mode shows a divergence, thus providing a route to probe such mode in experiments with ultracold atoms.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
