Jiadong Zang joined the Materials Science Program and Department of Physics in 2015 after 3 years in the Institute for Quantum Matter, Johns Hopkins University as a postdoctoral fellow. Jiadong's major research interest is the theoretical condensed matter physics, with a recent focus on topological phenomena and non-equilibrium transport theories.
My main teaching interest is the theoretical courses in physics. I am teaching Quantum Mechanics (PHYS 943, 944) starting from spring semester 2016. I’m interested in conveying the physical pictures with minimal algebras, and helping students build physical intuitions.
- Topological phenomena in condensed matter physics.
- Magnetic skyrmions in non-centrosymmetric magnets.
- Non-equilibrium quasi-particle transports.
Topology is a beautiful language in mathematics but now also showing its elegancy in condensed matter physics. The topological properties owned by materials are robust against disorders, perturbations, and thermal fluctuations. Outstanding examples include topological insulator, topological superconductor, and topological spin textures. A deep understanding of them and exploration of new topological phenomena is my major interest.
The marriage of topology and magnetism gives birth to the magnetic skyrmion, a topological spin texture in which local magnetic moments point in all directions wrapping a sphere. I have extensively worked on skyrmion physics ever since its experimental discovery in 2009. I discussed, in language of emergent electromagnetic field, dynamics of skyrmions under various stimuli. My recent efforts have been paid to manipulate single skyrmions in confined geometries, and discover new materials in which skyrmions interplay with other unconventional orderings.
Modern techniques are strongly motivated to challenge all possible existing limits. Consequently the device sizes and response times are getting extremely smaller, in which circumstances the standard equilibrium theory are no longer valid. The electron conductions, magnetization dynamics, and other quasi-particle transport through these mediums driven by time-dependent stimuli are my current interest. All these scenarios call for the development of non-equilibrium transport theory and high performance simulation algorithms.
I not only concentrate on exploring deep physics, but also extensively devote in bridging the gap between experiment and theory; providing explanations of, and predictions for, experiments.
1. F. Zheng, et al., Direct Image of a zero-field target skyrmion and its polarity switch in chiral magnetic nanodisk, Phys. Rev. Lett. 119, 197205 (2017). Press release: Physics, Physicsworld, and Phys.org.
2. Wei Li, et al., Emergence of skyrmions from rich parent phases in the molybdenum nitrides, Phys. Rev. B 93, 060409 Rapid Communications (2016)
3. X. Zhao, et al., Direct observation of cascading phase transitions in skyrmion cluster states within FeGe nanodisks, Proc. Natl. Acad. Sci, 1600197113 (2016)
4. H. Du, et al., Edge-mediated skyrmion chain and its collective dynamics in a confined geometry, Nature Communications, 6, 8502 (2015).
5. H. Du, et al., Electrical probing of field-driven cascading quantized transitions of skyrmion cluster states in MnSi nanowires, Nature Communications, 6, 7637 (2015).
6. J. S. White, et al., Electric field-induced Skyrmion distortion and lattice rotation in the magnetoelectric insulator Cu2OSeO3, Phys. Rev. Lett. 113, 107203(2014), Editors’ Suggestion.
7. M. Mochizuki, et al., Thermally driven ratchet motion of a skyrmion microcrystal and topological magnon Hall effect, Nature Materials, 13, 241 (2014).
8. Lingyao Kong, and J. Zang, Dynamics of insulating skyrmion under temperature gradient, Phys. Rev. Lett. 111, 067203 (2013).
9. J. Zang, M. Mostovoy, J. H. Han, and N. Nagaosa, Dynamics of skyrmion crystal in metallic thin films, Phys. Rev. Lett. 107, 136804 (2011).
10. X. L. Qi, R. Li, J. Zang, and S. C. Zhang, Seeing the magnetic monopole through the mirror of topological surface states, Science 323, 1184(2009).