Long-range-ordered phase in a quantum Heisenberg chain with interactions beyond nearest neighbors

• URL: http://arxiv.org/abs/2103.04271v2
• Date: Wed, 18 Aug 2021 05:15:04 GMT
• Title: Long-range-ordered phase in a quantum Heisenberg chain with interactions beyond nearest neighbors
• Authors: Zehan Li, Sayan Choudhury, and W. Vincent Liu
• Abstract summary: cavity mediated infinite range interactions can induce fast scrambling in a Heisenberg $XXZ$ spin chain. We analyze the kaleidoscope of quantum phases that emerge in this system from the interplay of these interactions.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Spin ensembles coupled to optical cavities provide a powerful platform for engineering synthetic quantum matter. Recently, we demonstrated that cavity mediated infinite range interactions can induce fast scrambling in a Heisenberg $XXZ$ spin chain (Phys. Rev. Research {\bf 2}, 043399 (2020)). In this work, we analyze the kaleidoscope of quantum phases that emerge in this system from the interplay of these interactions. Employing both analytical spin-wave theory as well as numerical DMRG calculations, we find that there is a large parameter regime where the continuous $U(1)$ symmetry of this model is spontaneously broken and the ground state of the system exhibits $XY$ order. This kind of symmetry breaking and the consequent long range order is forbidden for short range interacting systems by the Mermin-Wagner theorem. Intriguingly, we find that the $XY$ order can be induced by even an infinitesimally weak infinite range interaction. Furthermore, we demonstrate that in the $U(1)$ symmetry broken phase, the half chain entanglement entropy violates the area law logarithmically. Finally, we discuss a proposal to verify our predictions in state-of-the-art quantum emulators.

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