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An anomaly in quantum phases induced by borders
Jun Jing1,2, Mike Guidry3, Lian-Ao Wu4,5
1Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou, 310027, Zhejiang, China.
Scientific Reports
|April 26, 2020
Summary
Researchers discovered a new type of quantum phase transition in a circular spin model. This transition, triggered by changing boundary conditions instead of the Hamiltonian, reveals an infinite number of single-particle levels.
Area of Science:
- Condensed Matter Physics
- Quantum Mechanics
Background:
- Quantum phase transitions (QPT) are typically induced by altering a system's Hamiltonian.
- Previous studies focused on Hamiltonian changes to observe QPT.
Purpose of the Study:
- To investigate quantum phase transitions induced by boundary conditions.
- To explore anomalies in quantum phases within a circular spin model.
Main Methods:
- Utilized a circular spin model with Heisenberg XY interactions.
- Analyzed the system's behavior under altered boundary conditions without a magnetic field.
Main Results:
- Observed an anomaly in quantum phases driven by a change in boundary conditions.
- Identified an infinite number of single-particle levels in the anomalous phase.
- Noted a pattern similar to single-photon-triggered quantum phase transitions in the Rabi model.
Conclusions:
- Boundary conditions can induce quantum phase transitions, independent of Hamiltonian changes.
- The observed anomaly provides a new mechanism for studying quantum phase transitions.
- This finding expands the understanding of quantum phase transitions and their underlying mechanisms.
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