Quantum gas goes below absolute zero

  title={Quantum gas goes below absolute zero},
  author={Zeeya Merali},
  • Z. Merali
  • Published 3 January 2013
  • Physics
  • Nature
Ultracold atoms pave way for negative-Kelvin materials. 

A Topological Approach to Shrinking Higher Dimensions of Space to Observable Space-Time: Can the Dimensional Anisotropy of Space Satisfy Mach’s Principle?

We create a model universe by equipping a topological surface (system) with compact dimensions insulated by an information blocking horizon. The insulated compact WF can produce entanglement



Equilibration rates and negative absolute temperatures for ultracold atoms in optical lattices.

It is shown theoretically that, by reversing the confining potential, stable superfluid condensates at finite momentum and T<0 can be created with low entropy production for attractive bosons.

Spin gradient demagnetization cooling of ultracold atoms.

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 Absolute Temperature for Motional Degrees of Freedom

An attractively interacting ensemble of ultracold bosons at negative temperature that is stable against collapse for arbitrary atom numbers is created by tailoring the Bose-Hubbard Hamiltonian, enabling fundamentally new many-body states.

Interacting fermionic atoms in optical lattices diffuse symmetrically upwards and downwards in a gravitational potential.

A cloud of fermionic atoms in an optical lattice described by a Hubbard model with an additional linear potential is considered, showing that the width of the cloud increases with t^{1/3} for long times consistent with results from the Boltzmann simulations.