Giant $c$-axis nonlinear anomalous Hall effect in T$_d$-MoTe$_2$ and WTe$_2$

no code implementations • 12 Mar 2021 • Archana Tiwari, Fangchu Chen, Shazhou Zhong, Elizabeth Drueke, Jahyun Koo, Austin Kaczmarek, Cong Xiao, Jingjing Gao, Xuan Luo, Qian Niu, Yuping Sun, Binghai Yan, Liuyan Zhao, Adam W. Tsen

While the anomalous Hall effect can manifest even without an external magnetic field, time reversal symmetry is nonetheless still broken by the internal magnetization of the sample.

Mesoscale and Nanoscale Physics

Topological electric driving of magnetization dynamics in insulators

no code implementations • 18 Jan 2021 • Cong Xiao, Bangguo Xiong, Qian Niu

Established forms of electromagnetic coupling are usually conservative (in insulators) or dissipative (in metals and semiconductors).

Mesoscale and Nanoscale Physics

Van der Waals Heterostructure Pt$_{2}$HgSe$_{3}$/CrI$_3$ for Topological Valleytronics

no code implementations • 24 Dec 2020 • Zheng Liu, Yulei Han, Yafei Ren, Qian Niu, Zhenhua Qiao

We identify a valley-polarized Chern insulator in the van der Waals heterostructure, Pt$_{2}$HgSe$_{3}$/CrI$_3$, for potential applications with interplay between electric, magnetic, optical, and mechanical effects.

Band Gap Materials Science

Floquet-Bloch Oscillations and Intraband Zener Tunneling in an Oblique Spacetime Crystal

no code implementations • 1 Nov 2020 • Qiang Gao, Qian Niu

We investigate an oblique spacetime crystal realized by a monoatomic crystal in which a mode of sound propagates.

Other Condensed Matter