Negative Temperatures?

@article{Carr2013NegativeT,
  title={Negative Temperatures?},
  author={L. Carr},
  journal={Science},
  year={2013},
  volume={339},
  pages={42 - 43}
}
  • L. Carr
  • Published 2013
  • Physics, Medicine
  • Science
A cloud of potassium atoms is tuned to negative temperatures via a quantum phase transition. Ultracold quantum gases present an exquisitely tunable quantum system. Applications include precision measurement (1), quantum simulations for advanced materials design (2), and new regimes of chemistry (3). Typically trapped in a combination of magnetic fields and laser beams, strongly isolated from the environment in an ultrahigh vacuum, and cooled to temperatures less than a microdegree above… Expand
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