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Dr Helen He's Outputs (3)

Out-of-Plane Piezoelectricity and Ferroelectricity in Layered α-In2Se3 Nanoflakes (2017)
Journal Article
Zhou, Y., Wu, D., Zhu, Y., Cho, Y., He, Q., Yang, X., …Lai, K. (2017). Out-of-Plane Piezoelectricity and Ferroelectricity in Layered α-In2Se3 Nanoflakes. Nano Letters, 17(9), 5508-5513. https://doi.org/10.1021/acs.nanolett.7b02198

Piezoelectric and ferroelectric properties in the two-dimensional (2D) limit are highly desired for nanoelectronic, electromechanical, and optoelectronic applications. Here we report the first experimental evidence of out-of-plane piezoelectricity an... Read More about Out-of-Plane Piezoelectricity and Ferroelectricity in Layered α-In2Se3 Nanoflakes.

Electric-field control of tri-state phase transformation with a selective dual-ion switch (2017)
Journal Article
Lu, N., Zhang, P., Zhang, Q., Qiao, R., He, Q., Li, H., …Yu, P. (2017). Electric-field control of tri-state phase transformation with a selective dual-ion switch. Nature, 546(7656), 124-128. https://doi.org/10.1038/nature22389

Materials can be transformed from one crystalline phase to another by using an electric field to control ion transfer, in a process that can be harnessed in applications such as batteries1, smart windows2 and fuel cells3. Increasing the number of tra... Read More about Electric-field control of tri-state phase transformation with a selective dual-ion switch.

The unconventional doping in YBa2Cu3O7−x/La0.7Ca0.3MnO3 heterostructures by termination control (2017)
Journal Article
Tra, V., Huang, R., Gao, X., Chen, Y., Liu, Y., Kuo, W., …Chu, Y. (2017). The unconventional doping in YBa2Cu3O7−x/La0.7Ca0.3MnO3 heterostructures by termination control. Applied Physics Letters, 110(3), Article 032402. https://doi.org/10.1063/1.4973996

In strongly correlated oxides, heterostructures provide a powerful route to manipulate the charge, spin, orbital, and lattice degrees of freedom to create distinctive functionalities. In this work, we have achieved atomically precise interface contro... Read More about The unconventional doping in YBa2Cu3O7−x/La0.7Ca0.3MnO3 heterostructures by termination control.