Journal
PHYSICAL REVIEW A
Volume 85, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.85.041604
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Funding
- NSF [PFC, PIF-0904017, DMR-0449521]
- AFOSR
- ARO
- DARPA-OLE
- DOE [de-sc0003910]
- U.S. Department of Energy (DOE) [DE-SC0003910] Funding Source: U.S. Department of Energy (DOE)
- Direct For Mathematical & Physical Scien
- Division Of Physics [0904017] Funding Source: National Science Foundation
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We calculate experimentally relevant properties of trapped fermionic alkaline-earth-metal atoms in an optical lattice, modeled by the SU(N) Hubbard model. We employ a high-temperature expansion that is accurate when the temperature is larger than the tunneling rate, similar to current regimes in ultracold atom experiments. In addition to exploring the Mott insulator-metal crossover, we calculate final temperatures achieved by the standard experimental protocol of adiabatically ramping from a noninteracting gas, as a function of initial gas temperature. Of particular experimental interest, we find that increasing N for fixed particle numbers and initial temperatures gives substantially colder Mott insulators after the adiabatic ramping, up to more than a factor of 5 for relevant parameters. This cooling happens for all N, fixing the initial entropy, or for all N less than or similar to 20 (the exact value depends on dimensionality), at fixed, experimentally relevant initial temperatures.
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