4 papers
Quantum Many-Body Scars, Magnon-Pair Condensation, and Hilbert Space Fragmentation in an Anisotropic Heisenberg Model
J. Y. Liu-Sun, Z. Song
We investigate a spin- anisotropic Heisenberg model on a lattice consisting of two identical bipartite sublattices. A family of exact eigenstates generated by the restricted s…
Exceptional-point-induced dynamic sensitivity to particle-number parity
J. Y. Liu-Sun, Z. Song
As an exclusive feature of a non-Hermitian system, the existence of exceptional points (EPs) depends not only on the details of the Hamiltonian but also on the particle-number fill…
Resonant Fields Inducing Energy Towers in Lieb Quantum Spin Lattice
J. Y. Liu-Sun, Z. Song
We study a ferromagnetic XXZ Heisenberg model on a Lieb lattice. A set of exact eigenstates is constructed based on the restricted spectrum generating algebra (RSGA) when a resonan…
Condensate ground states of hardcore bosons induced by an array of impurities
J. Y. Liu-Sun, E. S. Ma, Z. Song
Neither hardcore bosons nor fermions can occupy the same lattice site-state. However, a nearest neighbour interaction may counteract the hardcore effect, resulting in condensate st…