Comment on "Quantum Time Crystals and Interacting Gauge Theories in Atomic Bose-Einstein Condensates"
arXiv:2002.11186 · doi:10.1103/PhysRevLett.124.178901
Abstract
In a recent letter [Phys. Rev. Lett. 123, 250402], Öhberg and Wright describe a Bose-Einstein condensate trapped on a ring in the presence of the density-dependent gauge potential. It is claimed that the ground state of the system corresponds to a rotating chiral bright soliton and consequently it forms a genuine time crystal which minimizes its energy by performing periodic motion. We show that the energy of the chiral soliton in the laboratory frame is not correctly calculated in the letter. The correct energy becomes minimal if the soliton does not move.
arXiv comment1 page; Comment on Phys. Rev. Lett. 123, 250402 (version accepted for publication in Phys. Rev. Lett.)
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- Quantum Time Crystals
- Time crystals: a review
- Absence of Quantum Time Crystals
- Comment on "Quantum Time Crystals": a new paradigm or just another proposal of perpetuum mobile?
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