Dynamical Quasicondensation of Hard-Core Bosons at Finite Momenta

Autor:	Vidmar, L., Ronzheimer, J. P., Schreiber, M., Braun, S., Hodgman, S. S., Langer, S., Heidrich-Meisner, F., Bloch, I., Schneider, U.
Rok vydání:	2015
Předmět:	Condensed Matter - Quantum Gases Condensed Matter - Statistical Mechanics Condensed Matter - Strongly Correlated Electrons Quantum Physics
Zdroj:	Phys. Rev. Lett. 115, 175301 (2015)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.115.175301
Popis:	Long-range order in quantum many-body systems is usually associated with equilibrium situations. Here, we experimentally investigate the quasicondensation of strongly-interacting bosons at finite momenta in a far-from-equilibrium case. We prepare an inhomogeneous initial state consisting of one-dimensional Mott insulators in the center of otherwise empty one-dimensional chains in an optical lattice with a lattice constant $d$. After suddenly quenching the trapping potential to zero, we observe the onset of coherence in spontaneously forming quasicondensates in the lattice. Remarkably, the emerging phase order differs from the ground-state order and is characterized by peaks at finite momenta $\pm (\pi/2) (\hbar / d)$ in the momentum distribution function. Comment: See also Viewpoint: Emerging Quantum Order in an Expanding Gas, Physics 8, 99 (2015)
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1505.05150 Zobrazit plný text záznamu View this record from Arxiv