晏飞翔 - 哈尔滨工业大学（深圳）

个人简介

Fei Yen obtained his PhD in physics from the University of Houston in May 2007. His research interests are on the study of strongly correlated systems via measurements of their magnetic susceptibility, conductivity, specific heat and (or) dielectric spectroscopy under extreme conditions such as low temperature, high pressure and (or) strong magnetic fields.

研究领域

As of recent, we discovered a new type of magnetism based on orbital motion of protons (H+) [1]. This is in contrast to the mainstream study of electron spin, electron orbital motion and their spin-orbit coupling effects. In most hydrogen-based compounds, the electrons of the hydrogen atoms pair up with another electron of a host entity and the remaining proton(s) trace out current loops to yield a weak magnetic moment mp. For instance, as shown in Fig. 1, when an NH4+ cation rotates by 120°, three protons completely trace out a loop which generates an associated mp along the axis of rotation [2]. If two neighboring mp did not interact, then this topic would not be interesting, but they do. This is because the magnitude and direction of the angular momentum of the rotors and mp are linearly coupled. As the system is cooled and many of the other rotational (such as those of an entire molecule), vibrational and even phonon modes (which also carry angular momentum in crystals) become inaccessible, the remaining modes (proton orbitals) must therefore couple in order to conserve the total angular momentum of the system. Protons orbiting at similar frequencies in very close proximity causes orbital resonance.

近期论文

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Y. Y. Xu, L. Meng, M. M. Zhao, C. X. Peng, F. Yen, "Electric polarization and magnetic properties of (NH4)1–xKxI (x = 0.05–0.17)," Journal of Alloys and Compounds 960, 170685 (2023). https://doi.org/10.1016/j.jallcom.2023.170685 (free access before July 15, 2023: https://authors.elsevier.com/a/1h8nP3IWkcAbLk) L. Meng, M. M. Zhao, Y. Y. Xu, C. X. Peng, Y. Yang, T. T. Xing, P. Ren, F. Yen, "Magnetic interactions based on proton orbital motion in CH3NH3PbI3 and CH3NH3PbBr3," Scripta Materialia 226, 115229 (2023). https://doi.org/10.1016/j.scriptamat.2022.115229 C. X. Peng, L. Meng, Y. Y. Xu, T. T. Xing, M. M. Zhao, P. Ren, F. Yen, "Ferroelectricity driven by orbital resonance of protons in CH3NH3Cl and CH3NH3Br," Journal of Materials Chemistry C 10, 1334 (2022). https://doi.org/10.1039/D1TC04718C L. Meng, C. X. Peng, C. He, F. Yen, "Magnetic properties of NH4Al(SO4)2-12H2O: Evidence of glass behavior based on proton orbitals," Scripta Materialia 205 114184 (2021). https://doi.org/10.1016/j.scriptamat.2021.114184 L. Meng, C. He, W. Ji, F. Yen, "Magnetic Properties of NH4H2PO4 and KH2PO4: Emergence of Multiferroic Salts," The Journal of Physical Chemistry Letters 11, 8297-8301 (2020). https://pubs.acs.org/doi/10.1021/acs.jpclett.0c02634 L. Meng, C. He, F. Yen*, "Magnetoelectric Coupling Based on Protons in Ammonium Sulfate," The Journal of Physical Chemistry C 124, 17255-17261 (2020). https://doi.org/10.1021/acs.jpcc.0c06048 F. Yen*, L. Meng, T. Gao, S. Hu, "Magnetic ordering of ammonium cations in NH4I, NH4Br, and NH4Cl," The Journal of Physical Chemistry C 123, 23655-23660 (2019). https://pubs.acs.org/doi/10.1021/acs.jpcc.9b07620 F. Yen, "Magnetically driven structural phase transition in hexamethylbenzene," The Journal of Physical Chemistry C 122, 29628-29632 (2018). https://pubs.acs.org/doi/10.1021/acs.jpcc.8b09864 F. Yen, "Isotope effect on the magnetic properties of hexamethylbenzene: Evidence of magnetism based on correlated motion of deuterons," The Journal of Physical Chemistry C 122, 16304-16308 (2018). https://pubs.acs.org/doi/10.1021/acs.jpcc.8b04255 S. Q. Chen, C. X. Guan, S. M. Ke, X. R. Zeng, C. W. Huang, S. X. Hu, F. Yen, H. L. Huang, Y. L. Lu, L. Chen, "Modulation of Abnormal Poisson’s Ratios and Electronic Properties in Mixed-Valence Perovskite Manganite Films," ACS Applied Materials & Surfaces 10, 18029-18035 (2018). https://pubs.acs.org/doi/10.1021/acsami.7b19580 X. Chen, S. J. Zheng, J. Li, G. T. Ma, F. Yen*, "A linear induction motor with a coated conductor superconducting secondary," Physica C: Superconductivity and its Applications 550, 82-84 (2018). https://doi.org/10.1016/j.physc.2018.04.002 Z. H. Chi*#, X. L. Chen#, F. Yen#, F. Peng#, Y. H. Zhou, J. L. Zhu, Y. J. Zhang, X. D. Liu, C. L. Lin, S. Q. Chu, Y. C. Li*, J. G. Zhao*, T. Kagayama, Y. M. Ma, Z. R. Yang*, “Superconductivity in pristine 2H-MoS2 at ultrahigh pressure,” Physical Review Letters 130, 037002 (2018). #Contributed equally. https://doi.org/10.1103/PhysRevLett.120.037002 F. Yen*, Z. Z. Zhao, S. X. Hu, L. Chen, “Molecular dynamics of hexamethylbenzene at low temperatures; evidence of unconventional magnetism based on rotational motion of protons,” Angewandte Chemie International Edition 56, 13675-13678, Very Important Paper (2017). https://doi.org/10.1002/anie.201707024 F. Yen*, Z. H. Chi, A. Berlie, X. D. Liu, A. F. Goncharov, “Dielectric Anomalies in Crystalline Ice: Indirect Evidence of the Existence of a Liquid-Liquid Critical Point in H2O,” Journal of Physical Chemistry C 119, 35, 20618 (2015). https://pubs.acs.org/doi/10.1021/acs.jpcc.5b07635 X. C. Pan, X. L. Chen, H. M. Liu, Y. Q. Feng, Z. X. Wei, Y. H. Zhou, Z. H. Chi, L. Pi, F. Yen, F. Q. Song, X. G. Wan*, Z. R. Yang*, B. G. Wang*, G. H. Wang, Y. H. Zhang, "Pressure-driven dome-shaped superconductivity and electronic structural evolution in tungsten ditelluride," Nature Communications 6, 7805 (2015). https://doi.org/10.1038/ncomms8805 F. Yen*, Tian Gao, “Dielectric anomaly in ice near 20 K: Evidence of macroscopic quantum phenomena,” Journal of Physical Chemistry Letters 6, 2822 (2015). https://pubs.acs.org/doi/10.1021/acs.jpclett.5b00797 This work was highlighted in https://phys.org/news/2015-07-macroscopic-quantum-phenomena-ice.html A. F. Goncharov*, N. Holtgrewe, G. R. Qian, C. H. Hu, A. R. Oganov, M. Somayazulu, E. Stavrou, C. J. Pickard, A. Berlie, F. Yen, M. Mahmood, S. S. Lobanov, Z. Konopkova, V. B. Prakapenka, “Backbone NxH Compounds at High Pressures,” Journal of Chemical Physics 142, 214308 (2015). F. Yen*, Z. H. Chi, “Proton ordering dynamics of H2O ice,” Physical Chemistry Chemical Physics 17, 12458-12461 (2015).