Research


I. Epitaxial Growth and Fabrication of Complex Oxide Nanostructrues and Heterostrucutres

Rajapitamahuni et al., Phys. Rev. Lett. (2016)

 

Chen et al., Adv. Mater. (2017)

 

Chen et al., Adv. Mater. (2018)

 
Complex oxides exhibit a rich variety in their electronic and magnetic properties. Famous members include the correlated oxides such as high temperature superconductors and colossal magnetoresistive oxides (CMR), ferroelectrics, and multiferroics. An even richer spectrum of behavior can be realized at the epitaxial interface between oxides with different functionalities. Our research focuses on controlling and manipulating of the electronic and magnetic property of complex oxide interfaces and nanostructures. Current projects include examining the interface magnetoelectric coupling between ferroelectrics and correlated oxides, and tailoring magnetic anisotropy in CMR oxide via strain or nanostructure engineering.


II. Interfacing Ferroelectrics with 2D Electron Systems: Graphene and Layered 2D Semiconductors
 

Rajapitamahuni et al., Nano Lett. (2013)

 

Xiao. et al., Phys. Rev. Lett. (2017)

Li et al., Nat. Commun. (2020)

 

We have interfaced graphene and MoS2 with ferroelectric oxides and polymers to achieve nonvolatile modulation of electrical and optical properties at the nanoscale. Examples include the hybrid devices composed of graphene and ferroelectric oxide Pb(Zr,Ti)O3 and polymer PVDF.


III. Nanoscale Scanning Probe Studies of Ferroic Materials
 

 

Song. et al., ACS Appl. Mater. & Interfaces. (2018)

The nanoscale control of ferroelectrics is a powerful tool to induce local modulation in two dimensional electron systems. It also has a wide range of applications in nano-electronics. We have carried out nanoscale scanning probe studies of ferroelectric oxide and polymer thin films, as well as emerging polar materials such as the hybrid perovskite, using atomic force and piezoresponse force microscopes.