تقرير
Critical fluctuation and noise spectra in two-dimensional Fe$_{3}$GeTe$_{2}$ magnets
| العنوان: | Critical fluctuation and noise spectra in two-dimensional Fe$_{3}$GeTe$_{2}$ magnets |
|---|---|
| المؤلفون: | Li, Yuxin, Ding, Zhe, Wang, Chen, Sun, Haoyu, Chen, Zhousheng, Wang, Pengfei, Wang, Ya, Gong, Ming, Zeng, Hualing, Shi, Fazhan, Du, Jiangfeng |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter Quantum Physics |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Quantum Physics |
| الوصف: | Critical fluctuations play a fundamental role in determining the spin orders for low-dimensional quantum materials, especially for recently discovered two-dimensional (2D) magnets. Here we employ the quantum decoherence imaging technique utilizing nitrogen-vacancy centers in diamond to explore the critical magnetic fluctuations and the associated temporal spin noise in van der Waals magnet $\rm{Fe_{3}GeTe_{2}}$. We show that the critical fluctuation contributes to a random magnetic field characterized by the noise spectra, which can be changed dramatically near the critical temperature $T_c$. A theoretical model to describe this phenomenon is developed, showing that the spectral density is characterized by a $1/f$ noise near the $T_c$, while away from this point it behaves like a white noise. The crossover at a certain temperature between these two situations is determined by changing of the distance between the sample and the diamond. This work provides a new way to study critical fluctuation and to extract some of the critical exponents, which may greatly deepen our understanding of criticality in a wide range of physical systems. |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2407.00647 |
| رقم الأكسشن: | edsarx.2407.00647 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |