Spin fractionalization and zero modes in the spin- 12 XXZ chain with boundary fields

Pasnoori, Parameshwar R (ORCID:0000000161717337); Tang, Yicheng; Lee, Junhyun (ORCID:0000000241037024); Pixley, J H (ORCID:000000023109640X); Andrei, Natan (ORCID:0000000266985354); Azaria, Patrick (ORCID:0009000100602066)

doi:10.1103/thlq-h58t

In this work we propose a solid-state platform for creating quantum simulators based on implanted spin centers in semiconductors. We show that under the presence of an external magnetic field, an array of 𝑆=1 spin centers interacting through magnetic dipole-dipole interaction can be mapped into an effective spin-half system equivalent to the XYZ model in an external magnetic field. Interestingly, this system presents a wide range of quantum phases and critical behaviors that can be controlled via magnetic field and orientational arrangement of the spin centers. We demonstrate our interacting spin chain can be tuned to both isotropic Heisenberg model and transverse-field Ising universality class. Notably, our model contains a line where the system is in a critical floating phase that terminates at Berezinskii-Kosterlitz-Thouless and Pokrovsky-Talapov transition points. We propose this system as a solid-state quantum simulator for the floating phase based on spin centers.

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