期刊
PHYSICAL REVIEW LETTERS
卷 125, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.050402
关键词
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资金
- NSFC [11574022, 61835013, 61227902, 61721091]
- National Key R&D Program of China [2016YFA0301500]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB01020300, XDB21030300]
We demonstrate the existence of finite-component multicriticality in a qubit-boson model where biased qubits collectively coupled to a single-mode bosonic field. The interplay between biases and boson-qubit coupling produces a rich phase diagram which shows multiple superradiant phases and phase boundaries of different orders. In particular, multiple phases become indistinguishable in appropriate bias configurations, which is the signature of multicriticality. A series of universality classes characterizing these multicritical points are identified. Moreover, we present a trapped-ion realization with the potential to explore multicritical phenomena experimentally using a small number of ions. The results open a novel way to probe multicritical universality classes in experiments.
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