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The effect of dephasing and spin-lattice relaxation during the switching processes in quantum antiferromagnets
by Asliddin Khudoyberdiev and Götz S. Uhrig
Submission summary
| Authors (as registered SciPost users): | Asliddin Khudoyberdiev · Götz S. Uhrig |
| Submission information | |
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| Preprint Link: | scipost_202507_00090v2 (pdf) |
| Date accepted: | Oct. 1, 2025 |
| Date submitted: | Sept. 16, 2025, 12:50 p.m. |
| Submitted by: | Asliddin Khudoyberdiev |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
The control of antiferromagnetic order can pave the way to large storage capacity as well as fast manipulation of stored data. Here achieving a steady-state of sublattice magnetization after switching is crucial to prevent loss of stored data. The present theoretical approach aims to obtain instantaneous stable states of the order after reorienting the N\'eel vector in open quantum antiferromagnets using time-dependent Schwinger boson mean-field theory. The Lindblad formalism is employed to couple the system to the environment. The quantum theoretical approach comprises differences in the effects of dephasing, originating from destructive interference of different wave vectors, and spin-lattice relaxation. We show that the spin-lattice relaxation results in an exponentially fast convergence to the steady-state after full ultrafast switching.
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- Provide a novel and synergetic link between different research areas.
- Open a new pathway in an existing or a new research direction, with clear potential for multi-pronged follow-up work
- Detail a groundbreaking theoretical/experimental/computational discovery
- Present a breakthrough on a previously-identified and long-standing research stumbling block
List of changes
In the third paragraph of the introduction, we corrected the sentence in front of Ref. [18].
We fixed the typo in the caption of Fig.1.
In the fifth paragraph of the introduction we highlighted the reason for the preferred quantum approach in our manuscript.
We clarified the indexation after Eq. (2) and inside the footnote in line 122.
After Eqs.(6), we changed the definition for E_0, from “the constant energy” to “ the ground state energy”.
In Fig.2 (a), a vertical dashed line is plotted at the time point where the field is switched off and it is explained in the caption of the plot.
We included “initial state” and “final state” phrases in Fig.2 (b).
We changed notations for the \vec{k}_0 mode at its all appearances as “\vec{k}_0=(0,0) and (\pi,\pi)”.
At the end of fourth section, we provided numerical estimates for small 2d antiferromagnet and emphasized the possibility of the N\'eel vector tunneling only in small systems by citing Waldmann et al., Phys. Rev. Lett. 102, 157202 (2009).
In the third paragraph of the conclusion, we mentioned the possibility of switching at lower fields, by applying time-dependent form at the resonance frequency. Additionally, we commented on Landau-Zener-Stückelberg effect by citing [28].
We added the references 10, 11, 26, 27 and 28.
Published as SciPost Phys. 19, 117 (2025)
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