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Showing 1 to 4 of 4 for “"Negative temperatures"”.
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Quantum simulation with an optical kagome lattice
… in the flat band of the kagome lattice using negative temperatures. In addition we report, for the first time, on the creation of a negative temperature state in a triangular lattice. This thesis additionally serves to collect and consolidate theoretical research that we can directly study …
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Bose-Hubbard physics in the kagome and triangular optical lattices at negative absolute temperature
… the frustrated physics by creating states with negative absolute temperature, which preferentially occupy the upper band edge. This technique is applied to the triangular and kagome lattices for the first time. In the triangular lattice, we study the superfluid-to-Mott insulator transition at …
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Thermometry and cooling of ultracold atoms in an optical lattice
… direction, inverted spin populations with negative temperatures have been produced. Spin gradient demagnetization has produced the closest approach to absolute zero yet recorded: 300 pK for the equilibrated system, and spin temperatures of 75 pK as well as -75 pK. The ability to achieve …
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Negative temperature states of bosons in triangular and kagome lattices
… the optical triangular and kagome lattices at negative temperature, where most atoms occupy the states with the highest energy. Due to geometric frustration, the highest energy states are Bloch states at the K and K′ points for the triangular lattice and the states in the flat band for the …