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cond-mat.mes-hall2026
Quantum geometric bounds at finite temperature for one-dimensional chiral systems
Peng He, Hai-Tao Ding, Yu-Guo Liu
The geometry and topology of quantum states are intimately related at zero temperature through exact bounds that constrain geometric quantities from below by topological invariants…
cond-mat.mes-hall2020
Quantum phase transition in a non-Hermitian XY spin chain with global complex transverse field
Yu-Guo Liu, Lu Xu, Zhi Li
In this work, we investigate the quantum phase transition in a non-Hermitian XY spin chain. The phase diagram shows that the critical points of Ising phase transition expand into a…