Condensed Matter > Strongly Correlated Electrons
[Submitted on 8 May 2024 (v1), last revised 18 Sep 2024 (this version, v2)]
Title:Simulating Spin Dynamics of Supersolid States in a Quantum Ising Magnet
View PDF HTML (experimental)Abstract:Motivated by the recent experimental study on a quantum Ising magnet $\text{K}_2\text{Co}(\text{SeO}_3)_2$ where spectroscopic evidence of zero-field supersolidity was presented [arXiv: 2402.15869], we simulate the excitation spectrum of the corresponding microscopic $XXZ$ model for the compound, using the recently developed excitation ansatz of infinite projected entangled-pair states (iPEPS). We map out the ground state phase diagram and compute the dynamical spin structure factors across a range of magnetic field strengths, focusing especially on the two supersolid phases found near zero and saturation fields. Our simulated excitation spectra for the zero-field supersolid "Y" phase are in excellent agreement with the experimental data - recovering the low-energy branches and integer quantized excited energy levels $\omega_n=nJ_{zz}$. Furthermore, we demonstrate the nonlocal multi-spin-flip features for modes at $\omega_2$, indicative of their multi-magnon nature. Additionally, we identify characteristics of the high-field supersolid "$\Psi$" phase in the simulated spectra, to be compared with future experimental results.
Submission history
From: Yi Xu [view email][v1] Wed, 8 May 2024 15:43:22 UTC (4,763 KB)
[v2] Wed, 18 Sep 2024 15:35:10 UTC (4,881 KB)
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