Time-symmetry breaking in a modulated cold atom system: An ideal mean-field transition

2013 ◽  
Vol 63 (4) ◽  
pp. 858-866
Author(s):  
Myoung-Sun Heo ◽  
Wonho Jhe
Keyword(s):  
Symmetry Breaking ◽  
Mean Field ◽  
Cold Atom ◽  
Time Symmetry ◽  
Atom System ◽  
Field Transition

scholarly journals Ideal mean-field transition in a modulated cold atom system

2010 ◽  
Vol 82 (3) ◽  
Author(s):  
Myoung-Sun Heo ◽  
Yonghee Kim ◽  
Kihwan Kim ◽  
Geol Moon ◽  
Junhyun Lee ◽  
...  
Keyword(s):  
Mean Field ◽  
Cold Atom ◽  
Atom System ◽  
Field Transition

scholarly journals Quantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum space

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Tao Chen ◽  
Wei Gou ◽  
Dizhou Xie ◽  
Teng Xiao ◽  
Wei Yi ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
State Of The Art ◽  
Cold Atom ◽  
Pt Symmetry ◽  
Level System ◽  
Flexible Control ◽  
Time Symmetry ◽  
Symmetry Phase ◽  
Lattice Quantum ◽  
Atomic Momentum

AbstractWe experimentally study quantum Zeno effects in a parity-time (PT) symmetric cold atom gas periodically coupled to a reservoir. Based on the state-of-the-art control of inter-site couplings of atoms in a momentum lattice, we implement a synthetic two-level system with passive PT symmetry over two lattice sites, where an effective dissipation is introduced through repeated couplings to the rest of the lattice. Quantum Zeno (anti-Zeno) effects manifest in our experiment as the overall dissipation of the two-level system becoming suppressed (enhanced) with increasing coupling intensity or frequency. We demonstrate that quantum Zeno regimes exist in the broken PT symmetry phase, and are bounded by exceptional points separating the PT symmetric and PT broken phases, as well as by a discrete set of critical coupling frequencies. Our experiment establishes the connection between PT-symmetry-breaking transitions and quantum Zeno effects, and is extendable to higher dimensions or to interacting regimes, thanks to the flexible control with atoms in a momentum lattice.

Colossal photovoltages in strain-driven crystal field transition and symmetry breaking of superconducting epitaxial systems

2019 ◽  
Vol 3 (5) ◽  
Author(s):  
Fei Xiong ◽  
Lin Xie ◽  
Luran Zhang ◽  
Jiyang Xie ◽  
Hui Zhang ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Crystal Field ◽  
Field Transition

Modification of charge density wave fluctuations by charge perturbations

2002 ◽  
Vol 12 (9) ◽  
pp. 77-78
Author(s):  
S. N. Artemenko
Keyword(s):  
Electric Field ◽  
Linear Response ◽  
Chemical Potential ◽  
Density Wave ◽  
Mean Field ◽  
Phase Fluctuations ◽  
Fluctuation Dissipation ◽  
Fluctuation Dissipation Theorem ◽  
The Mean ◽  
Field Transition

Spectral density of fluctuations of the CDW phase are calculated taking into account electric field induced by phase fluctuations. The approach based upon the fluctuation-dissipation theorem (FDT) combined with equations of linear response of the CDW conductor is used. Fluctuating electric field is found to suppress fluctuations of the phase, while fluctuations of the electric potential are sizeable. This suggests that transition from the CDW to the normal state (which is usually observed well below the mean-field transition temperature) may he provoked by fluctuations of the chemical potential, rather than by destruction of the CDW coherence between conducting chains due to phase fluctuations.

Sign in / Sign up

Export Citation Format

Share Document