Ground-state cooling of atoms in optical lattices

Popp, Markus; García-Ripoll, Juan José; Vollbrecht, K. G. H.; Cirac, J. I.

doi:10.1103/physreva.74.013622

Cited by 39 publications

(63 citation statements)

References 39 publications

(73 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Theoretical investigations show that these models exhibit rich phase diagrams which should be accessible with current experimental techniques [16,22,23,24,25]. The necessary low temperatures can be achieved by appropriate cooling methods [26,27,28,29]. It is also possible to implement artificial magnetic fields in this setup, for example by rotating the lattice [30,31,32,33].…”

Section: Introductionmentioning

confidence: 99%

Optical lattice quantum Hall effect

2008

View full text Add to dashboard Cite

We explore the behavior of interacting bosonic atoms in an optical lattice subject to a large artificial magnetic field. We extend earlier investigations of this system where the number of magnetic flux quanta per unit cell α is close to a simple rational number [Phys. Rev. Lett. 96, 180407 (2006)].Interesting topological states such as the Laughlin and Read-Rezayi states can occur even if the atoms experience a weak trapping potential in one direction. An explicit numerical calculation near α = 1/2 shows that the system exhibits a striped vortex lattice phase of one species, which is analogous to the behavior of a two-species system for small α. We also investigate methods to probe the encountered states. These include spatial correlation functions and the measurement of noise correlations in time-of-flight expanded atomic clouds. Characteristic differences arise which allow for an identification of the respective quantum Hall states. We furthermore discuss that a counterintuitive flow of the Hall current occurs for certain values of α.

show abstract

Section: Introductionmentioning

confidence: 99%

Optical lattice quantum Hall effect

2008

View full text Add to dashboard Cite

show abstract

“…Realization of this temperature scale requires the development of new methods of refrigeration which can be applied to ultracold atoms. Many such techniques have been proposed [6][7][8][9][10][11][12][13] but await experimental realization. The cooling method we demonstrate here opens up a previously inaccessible temperature regime and provides a realistic path to the observation of magnetic quantum phase transitions in optical lattices.…”

mentioning

confidence: 99%

“…For quicker equilibration, spin gradient demagnetization cooling could be implemented with lighter atomic species (e.g. 7 Li or 4 He * ) and/or shorter period optical lattices.…”

mentioning

confidence: 99%

Spin Gradient Demagnetization Cooling of Ultracold Atoms

et al. 2011

View full text Add to dashboard Cite

We demonstrate a new cooling method in which a time-varying magnetic field gradient is applied to an ultracold spin mixture. This enables preparation of isolated spin distributions at positive and negative effective spin temperatures of ±50 picokelvin. The spin system can also be used to cool other degrees of freedom, and we have used this coupling to cool an apparently equilibrated Mott insulator of rubidium atoms to 350 picokelvin. These are the lowest temperatures ever measured in any system. The entropy of the spin mixture is in the regime where magnetic ordering is expected.

show abstract

“…For example, a Bose-Einstein condensate was experimentally produced by adiabatically deforming the external trapping potential to increase the gas phase space density [44,45]. Furthermore, reshaping the underlying trap to create entropy-rich regions that are later isolated from the remaining system was proposed for bosons loaded into an optical lattice [46,47]. For fermions confined to an optical lattice, cooling could be achieved by immersion into a bosonic bath [48,49].…”

Section: Cooling By Trap Shapingmentioning

confidence: 99%

Thermodynamics of the three-dimensional Hubbard model: Implications for cooling cold atomic gases in optical lattices

et al. 2011

View full text Add to dashboard Cite

We present a comprehensive study of the thermodynamic properties of the three-dimensional fermionic Hubbard model, with application to cold fermionic atoms subject to an optical lattice and a trapping potential. Our study is focused on the temperature range of current experimental interest. We employ two theoretical methodsdynamical mean-field theory and high-temperature series-and perform comparative benchmarks to delimit their respective range of validity. Special attention is devoted to understand the implications that thermodynamic properties of this system have on cooling. Considering the distribution function of local occupancies in the inhomogeneous lattice, we show that, under adiabatic evolution, the variation of any observable (e.g., temperature) can be conveniently disentangled into two distinct contributions. The first contribution is due to the redistribution of atoms in the trap during the evolution, while the second one comes from the intrinsic change of the observable. Finally, we provide a simplified picture of a recently proposed cooling procedure, based on spatial entropy separation, by applying this method to an idealized model.

show abstract

Ground-state cooling of atoms in optical lattices

Cited by 39 publications

References 39 publications

Optical lattice quantum Hall effect

Optical lattice quantum Hall effect

Spin Gradient Demagnetization Cooling of Ultracold Atoms

Thermodynamics of the three-dimensional Hubbard model: Implications for cooling cold atomic gases in optical lattices

Contact Info

Product

Resources

About