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Finite-Component Multicriticality at the Superradiant Quantum Phase Transition
Han-Jie Zhu1, Kai Xu1, Guo-Feng Zhang1
1Key Laboratory of Micro-Nano Measurement-Manipulation and Physics (Ministry of Education), School of Physics, Beihang University, Xueyuan Road No. 37, Beijing 100191, China.
Physical Review Letters
|August 16, 2020
Summary
This study reveals finite-component multicriticality in a qubit-boson model, showing how qubit biases and coupling create complex phase diagrams. Researchers identified universality classes and proposed a trapped-ion experiment to explore these phenomena.
Area of Science:
- Quantum Many-Body Physics
- Condensed Matter Theory
- Quantum Information Science
Background:
- Multicriticality describes systems with multiple critical points merging.
- Understanding complex quantum phases is crucial for quantum technologies.
Purpose of the Study:
- To demonstrate finite-component multicriticality in a novel qubit-boson model.
- To characterize the universality classes of these multicritical points.
- To propose an experimental platform for studying multicritical phenomena.
Main Methods:
- Theoretical modeling of biased qubits coupled to a single-mode bosonic field.
- Analysis of the resulting phase diagram, identifying superradiant phases and phase boundaries.
- Identification of universality classes associated with multicritical points.
Main Results:
- Demonstrated the existence of finite-component multicriticality.
- Revealed a rich phase diagram with multiple superradiant phases and distinct phase boundaries.
- Identified specific universality classes characterizing the observed multicritical points.
Conclusions:
- The qubit-boson model exhibits complex multicritical behavior driven by bias and coupling.
- A trapped-ion system offers a viable experimental avenue for probing these multicritical phenomena.
- This work provides new methods for exploring multicritical universality classes in experiments.
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