Comment on "Space-time crystals of trapped ions".

@article{Bruno2013CommentO,
  title={Comment on "Space-time crystals of trapped ions".},
  author={Patrick Bruno},
  journal={Physical review letters},
  year={2013},
  volume={111 2},
  pages={
          029301
        }
}
  • P. Bruno
  • Published 20 November 2012
  • Physics, Medicine
  • Physical review letters
A Comment on "Space-Time Crystals of Trapped ions", by Tongcang Li et al. (PRL 109, 163001 (2012); arXiv:1206.4772 

Topics from this paper

Boundary Time Crystals.
TLDR
This work introduces boundary time crystals and analyzes in detail a solvable model where an accurate scaling analysis can be performed.
Absence of Quantum Time Crystals.
TLDR
A no-go theorem is proved that rules out the possibility of time crystals defined as such, in the ground state or in the canonical ensemble of a general Hamiltonian, which consists of not-too-long-range interactions.
Time crystals: a review.
TLDR
The struggle to observe discrete time crystals is reviewed here together with propositions that generalize this concept introducing condensed matter like physics in the time domain.
Order parameter in electron systems: its fluctuations and oscillations
The concept of the order parameter is extremely useful in physics. Here, I discuss extensions of this concept to cases when the order parameter is no longer a constant but fluctuates or oscillates in
ORDER PARAMETER IN ELECTRON SYSTEMS: ITS FLUCTUATIONS AND OSCILLATIONS
  • K. Efetov
  • Physics
    ЖУРНАЛ ЭКСПЕРИМЕНТАЛЬНОЙ И ТЕОРЕТИЧЕСКОЙ ФИЗИКИ
  • 2019
The concept of the order parameter is extremely useful in physics. Here, I discuss extensions of this concept to cases when the order parameter is no longer a constant but fluctuates or oscillates in
Isolated Heisenberg magnet as a quantum time crystal
Local observables of closed many-body quantum systems are generally believed to quickly equilibrate after a quench, according to the eigenstate thermalization hypothesis. Here, the authors show that
Trial wave functions for ring-trapped ions and neutral atoms: Microscopic description of the quantum space-time crystal
A constructive theoretical platform for the description of quantum space-time crystals uncovers for $N$ interacting and ring-confined rotating particles the existence of low-lying states with proper
Mean-field thermodynamic quantum time-space crystal: Spontaneous breaking of time-translation symmetry in a macroscopic fermion system
A model demonstrating existence of a thermodynamically stable quantum time-space crystal has been proposed and studied. This state is characterized by an order parameter periodic in both real and
Clean Floquet Time Crystals: Models and Realizations in Cold Atoms.
TLDR
It is pointed out that time crystals can generally exist in systems without disorder, and a series of clean quasi-one-dimensional models under Floquet driving are proposed to demonstrate this unexpected result in principle.
Discrete Time Crystals in the Absence of Manifest Symmetries or Disorder in Open Quantum Systems.
TLDR
A semiclassical approach reveals the emergence of a robust discrete time-crystalline phase in the thermodynamic limit in which metastability, dissipation, and interparticle interactions play a crucial role.
...
1
2
3
4
...