Department of Applied Physics, The University of Tokyo
| Oct. 2015 – | D.Eng. in Applied Physics, The University of Tokyo, Japan |
| Oct. 2013 – Sep. 2015 | M.Eng. in Applied Physics, The University of Tokyo, Japan |
| Sep. 2008 – Jul. 2012 | B.S. in Physics, Tsinghua University, Beijing, China |
| 2016 – | JSPS (Japan Society of the Promotion of Science) DC1 Research Fellow |
| [5] | X.-X. Zhang, N. Nagaosa - arXiv preprint arXiv:1608.06362 (2016), Ultrasonic responses of elastic stiffness in three-dimensional Skyrmion/monopole crystal |
| [4] | X.-X. Zhang, A. S. Mishchenko, G. De Filippis, N. Nagaosa - arXiv preprint arXiv:1608.05902 (2016), Electric transport in three-dimensional cubic Skyrmion/monopole crystal |
| [3] | X.-X. Zhang, T.T. Ong, N. Nagaosa - arXiv preprint arXiv:1607.05941 (2016), Theory of photoinduced Floquet Weyl semimetal phases |
| [2] | N. Kanazawa, Y. Nii, X.-X. Zhang, A. S. Mishchenko, G. De Filippis, F. Kagawa, Y. Iwasa, N. Nagaosa, Y. Tokura - Nat. Commun. 7:11622 (2016), Critical phenomena of emergent magnetic monopoles in a chiral magnet. |
| [1] | X.-X. Zhang, Y.-X. Yang, X.-B. Wang - Phys. Rev. A 88, 013838 (2013), Lossy quantum-optical metrology with squeezed states |
| [4] | March Meeting of American Physical Society (2016.3) Oral, Critical phenomena of emergent monopoles in a chiral magnet, X18: Focus Session, Baltimore, USA |
| [3] | New Perspectives in Spintronic and Mesoscopic Physics (2015.6) Poster, Electrical transport in three-dimensional cubic Skyrmion crystal, PS09, ISSP, Kashiwa, Japan |
| [2] | Workshop on “Topological Magnets” (2015.5) Poster, Electrical transport in three-dimensional cubic Skyrmion crystal, P05, Riken, Saitama, Japan |
| [1] | March Meeting of American Physical Society (2015.3) Oral, Electrical transport in three-dimensional cubic Skyrmion crystal, A28: Focus Session, San Antonio, USA |
| 2016 | JSPS DC1 Research Fellowship for Young Scientists (JSPS) |
| 2015 | Advanced Leading Graduate Course for Photon Science (University Scholarship) |
| 2013 | Panasonic Scholarship (Awarded by the Panasonic Inc.) |
My research interest lies in condensed matter theory with a focus on phenomena bearing interesting topological aspects. Before diving into this, I have worked on quantum metrology[1], which is enhancing measurement precision via quantum effects. After that, I studied a three-dimensional chiral magnet system (Fig. 1) inhabited by emergent magnetic monopoles connected by skyrmion tubes (Fig. 2), aiming at exploring the transport[4] and elastic[5] properties due to the influence from these very singular monopole defects.
In the presence of coupling between spin waves and electrons/phonons, we use Green’s function methods to explore the new effects originated from the topologically nontrivial magnetic texture upon which spin waves are generated. The major achievements are predicting a hump-dip-peak longitudinal magnetoresistivity (Fig. 3), reproducing the anisotropic ultrasonic responses experimentally observed (Fig. 4), and identifying a new topological phase transition of strong correlation genesis. Luckily, the experiments corroborated with our theory to a large extent[2].
I subsequently turned to the physics of Weyl fermions in solids, which, in contrast to the above, are monopoles living in the momentum space. Inspired by the advancements in ultrafast optical technology, I proposed a set of rich phases (Fig. 5,6) of photoinduced Weyl semimetal using linearly polarized light[3] instead of the the more commonly adopted circularly polarized light. Compared with other latest works, it doesn’t repuire the undriven parent system to be somehow topological (3D topological insulator, massless Dirac system) or symmetry protected (line-node semimetal) in the first place. We also managed to calculate the detectable photoinduced anomalous Hall effect emphasizing the crucial nonequilibrium electron distribution.
Currently, I am studying tranport in a Weyl semimetal under external magnetic field.
