期刊
PHYSICAL REVIEW LETTERS
卷 124, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.043001
关键词
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资金
- Frontier Science Center for Quantum Information of the Ministry of Education of China
- Tsinghua University Initiative Scientific Research Program
- National Key Research and Development Program of China [2016YFA0301902]
- Tsinghua University
- National Thousand-Young-Talents Program
- National Natural Science Foundation of China [11974201]
Dynamical quantum phase transitions are closely related to equilibrium quantum phase transitions for ground states. Here, we report an experimental observation of a dynamical quantum phase transition in a spinor condensate with correspondence in an excited state phase diagram, instead of the ground state one. We observe that the quench dynamics exhibits a nonanalytical change with respect to a parameter in the final Hamiltonian in the absence of a corresponding phase transition for the ground state there. We make a connection between this singular point and a phase transition point for the highest energy level in a subspace with zero spin magnetization of a Hamiltonian. We further show the existence of dynamical phase transitions for finite magnetization corresponding to the phase transition of the highest energy level in the subspace with the same magnetization. Our results open a door for using dynamical phase transitions as a tool to probe physics at higher energy eigenlevels of many-body Hamiltonians.
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