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Observation of terahertz second harmonic generation from Dirac surface states in the topological insulator ${Bi}_{2} {Se}_{3}$

https://doi.org/10.1103/PhysRevB.109.245112

Stensberg, Jonathan; Han, Xingyue; Ni, Zhuoliang; Yao, Xiong; Yuan, Xiaoyu; Mallick, Debarghya; Gandhi, Akshat; Oh, Seongshik; Wu, Liang (June 2024, Physical Review B)
Three-state nematicity and magneto-optical Kerr effect in the charge density waves in kagome superconductors

https://doi.org/10.1038/s41567-022-01805-7

Xu, Yishuai; Ni, Zhuoliang; Liu, Yizhou; Ortiz, Brenden R.; Deng, Qinwen; Wilson, Stephen D.; Yan, Binghai; Balents, Leon; Wu, Liang (December 2022, Nature Physics)

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Observation of Giant Surface Second-Harmonic Generation Coupled to Nematic Orders in the van der Waals Antiferromagnet FePS ₃

https://doi.org/10.1021/acs.nanolett.2c00212

Ni, Zhuoliang; Huang, Nan; Haglund, Amanda V.; Mandrus, David G.; Wu, Liang (April 2022, Nano Letters)

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Cavity-enhanced linear dichroism in a van der Waals antiferromagnet

https://doi.org/10.1038/s41566-022-00970-8

Zhang, Huiqin; Ni, Zhuoliang; Stevens, Christopher E.; Bai, Aofeng; Peiris, Frank; Hendrickson, Joshua R.; Wu, Liang; Jariwala, Deep (April 2022, Nature Photonics)

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Imaging the Néel vector switching in the monolayer antiferromagnet MnPSe3 with strain-controlled Ising order

https://doi.org/10.1038/s41565-021-00885-5

Ni, Zhuoliang; Haglund, A. V.; Wang, H.; Xu, B.; Bernhard, C.; Mandrus, D. G.; Qian, X.; Mele, E. J.; Kane, C. L.; Wu, Liang (April 2021, Nature Nanotechnology)
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Antiferromagnets are interesting materials for spintronics because of their faster dynamics and robustness against perturbations from magnetic fields. Control of the antiferromagnetic order constitutes an important step towards applications, but has been limited to bulk materials so far. Here, using spatially resolved second-harmonic generation, we show direct evidence of long-range antiferromagnetic order and Ising-type Néel vector switching in monolayer MnPSe3 with large XY anisotropy. In additional to thermally induced switching, uniaxial strain can rotate the Néel vector, aligning it to a general in-plane direction irrespective of the crystal axes. A change of the universality class of the phase transition in the XY model under uniaxial strain causes this emergence of strain-controlled Ising order in the XY magnet MnPSe3. Our discovery is a further ingredient for compact antiferromagnetic spintronic devices in the two-dimensional limit.
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Quantum Hall effect based on Weyl orbits in Cd3As2

https://doi.org/10.1038/s41586-018-0798-3

Zhang, Cheng; Zhang, Yi; Yuan, Xiang; Lu, Shiheng; Zhang, Jinglei; Narayan, Awadhesh; Liu, Yanwen; Zhang, Huiqin; Ni, Zhuoliang; Liu, Ran; et al (January 2019, Nature)

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