Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 34: Computational Magnetism I
MA 34.12: Vortrag
Mittwoch, 11. März 2026, 18:00–18:15, HSZ/0004
Ground-state phases and excitation spectra of dipole conserving spin-half chain — •Prabhakar Prabhakar1, Soumya Bera1, and Giuseppe De Tomasi2 — 1Department of Physics, Indian Institute of Technology Bombay, Mumbai 400076, India — 2CeFEMA-LaPMET, Departamento de Fisica, Instituto Superior Tecnico, Universidade de Lisboa, Portugal
We explore the ground state phase diagram of a translationally invariant, non-integrable one-dimensional spin chain with dipole conservation. The model is typically realized in quantum simulators, such as cold-atom setups, in the presence of a large, tilted electric field. Despite the strong kinetic constraints imposed by dipole conservation, which prevent the propagation of isolated spin excitations and suppress single-spin order, the system stabilizes an antiferromagnetic dipole-ordered ground state. However, at a large Ising interaction strength, the model shows a phase transition to a spin-ordered phase. Using exact diagonalization along with density matrix renormalization group simulations, we examine the associated phases with different antiferromagnetic order parameters, the entanglement spectrum, and the dynamical spectral function.
Keywords: Dipole conservation; Antiferromagnetism; Spin-half chain; DMRG; Excitation spectra