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Emerging Phenomena at Correlated Oxide Nanostructures and Interfaces

Date: 2018-05-10
Time: 10:00
Venue: 中科院物理研究所M楼255会议室
Speaker: Xia Hong

Department of Physics and Astronomy, University of Nebraska-Lincoln

Capitalizing on the energy competition of charge itineracy with the electron correlation effect and spin-orbit coupling, nanoscale manipulation of the charge, orbital and lattice degrees of freedom in correlated oxides can often lead to new functionalities that are inaccessible in the bulk form. In this talk, I will present our studies of the emerging phenomena at epitaxial correlated oxide nanostructures and hetero-interfaces that result from the nanoscale strain and charge control. By creating nanoscale periodic depth modulation, we have achieved a 50-fold enhancement of the magnetic crystalline anisotropy (MCA) in ultrathin colossal magnetoresistive (La,Sr)MnO3, which is attributed to a high strain gradient established in the nanostructures [1]. We have also exploited the ferroelectric field effect as a powerful tool to probe the critical role of charge in determining the MCA in LSMO [2], controlling the correlated transport of the charge transfer type Mott insulator (Sm,Nd)NiO3 [3], and modulating the spin relaxation in the semimetallic SrIrO3. Our work points to effective routes for tailoring the electronic and magnetic properties of correlated oxides, paving the path for their application in nanoelectronic and spintronic applications.
[1] A. Rajapitamahuni et al., PRL 116, 187201 (2016).
[2] A. Rajapitamahuni et al., submitted (2018).
[3] X. Chen et al., Adv. Mater. 29, 1701385 (2017).

Xia Hong received her B.S. degree from Peking University and Ph.D. from Yale University. Between 2006 and 2010, she worked as a postdoctoral scholar at Pennsylvania State University. She joined the Department of Physics and Astronomy at the University of Nebraska-Lincoln in 2011 as an Assistant Professor, and was promoted to Associate Professor with tenure in 2016. She received the National Science Foundation Career Award in 2012 and the Department of Energy Early Career Award in 2016. Her research focuses on the nanofabrication, magnetotransport and scanning probe studies of novel two-dimensional electron systems, epitaxial oxide nanostructures and interfaces.

邀请人:程智刚 副研究员(Tel:82649850)