Adiabatic cooling of bosons in lattices to magnetically ordered quantum states

Johannes Schachenmayer, David M. Weld, Hirokazu Miyake, Georgios A. Siviloglou, Wolfgang Ketterle, Andrew J. Daley

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We suggest and analyze a scheme to adiabatically cool bosonic atoms to picokelvin temperatures which should allow the observation of magnetic ordering via superexchange in optical lattices. The starting point is a gapped phase called the spin Mott phase, where each site is occupied by one spin-up and one spin-down atom. An adiabatic ramp leads to an xy-ferromagnetic phase. We show that the combination of time-dependent density matrix renormalization group methods with quantum trajectories can be used to fully address possible experimental limitations due to decoherence, and demonstrate that the magnetic correlations are robust for experimentally realizable ramp speeds. Using a microscopic master equation treatment of light scattering in the many-particle system, we test the robustness of adiabatic state preparation against decoherence. Due to different ground-state symmetries, we also find a metastable state with xy-ferromagnetic order if the ramp crosses to regimes where the ground state is a z ferromagnet. The bosonic spin Mott phase as the initial gapped state for adiabatic cooling has many features in common with a fermionic band insulator, but the use of bosons should enable experiments with substantially lower initial entropies.

LanguageEnglish
Article number041602
Number of pages6
JournalPhysical Review A
Volume92
Issue number4
DOIs
Publication statusPublished - 14 Oct 2015

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bosons
ramps
cooling
ground state
renormalization group methods
metastable state
atoms
light scattering
insulators
trajectories
entropy
preparation
symmetry
temperature

Keywords

  • bosonic atoms
  • optical lattices
  • quantum trajectories

Cite this

Schachenmayer, J., Weld, D. M., Miyake, H., Siviloglou, G. A., Ketterle, W., & Daley, A. J. (2015). Adiabatic cooling of bosons in lattices to magnetically ordered quantum states. Physical Review A, 92(4), [041602]. https://doi.org/10.1103/PhysRevA.92.041602
Schachenmayer, Johannes ; Weld, David M. ; Miyake, Hirokazu ; Siviloglou, Georgios A. ; Ketterle, Wolfgang ; Daley, Andrew J. / Adiabatic cooling of bosons in lattices to magnetically ordered quantum states. In: Physical Review A. 2015 ; Vol. 92, No. 4.
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Schachenmayer, J, Weld, DM, Miyake, H, Siviloglou, GA, Ketterle, W & Daley, AJ 2015, 'Adiabatic cooling of bosons in lattices to magnetically ordered quantum states' Physical Review A, vol. 92, no. 4, 041602. https://doi.org/10.1103/PhysRevA.92.041602

Adiabatic cooling of bosons in lattices to magnetically ordered quantum states. / Schachenmayer, Johannes; Weld, David M.; Miyake, Hirokazu; Siviloglou, Georgios A.; Ketterle, Wolfgang; Daley, Andrew J.

In: Physical Review A, Vol. 92, No. 4, 041602, 14.10.2015.

Research output: Contribution to journalArticle

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