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Abstract
The stationary behavior of a quantum system is determined by its Hamiltonian and its boundary conditions. All quantum phase transitions (QPT) reported previously were induced by changing the Hamiltonian. In a circular spin model with Heisenberg XY interactions and no magnetic field, we observe an anomaly in quantum phases caused by a qualitative change of the boundary condition. The unexpected anomaly features an infinite number of single-particle levels, in the same pattern as the single-photon-triggered quantum phase transition in the Rabi model.
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Details
1 Zhejiang University, Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Hangzhou, China (GRID:grid.13402.34) (ISNI:0000 0004 1759 700X); The University of the Basque Country (EHU/UPV), Department of Theoretical Physics and History of Science, Bilbao, Spain (GRID:grid.11480.3c) (ISNI:0000000121671098)
2 University of Tennessee, Department of Physics and Astronomy, Knoxville, USA (GRID:grid.411461.7) (ISNI:0000 0001 2315 1184)
3 The University of the Basque Country (EHU/UPV), Department of Theoretical Physics and History of Science, Bilbao, Spain (GRID:grid.11480.3c) (ISNI:0000000121671098); Ikerbasque, Basque Foundation for Science, Bilbao, Spain (GRID:grid.424810.b) (ISNI:0000 0004 0467 2314)