Complexity
under Spatial Confinement
Jian Shen
Materials
Science and Technology Division and Center for Nanophase
Materials Sciences Division, Oak Ridge National Laboratory, US
&
Department
of Physics and Astronomy, The University of Tennessee, US
Abstract:
The two hottest
areas of research in condensed matter physics are complexity and nanoscale physics. Interestingly, these two areas have
little overlap as most of the nanophysics research work is conducted using
“simple” materials of metals or semiconductors instead of complex materials
such as transition metal oxides. However, due to the strong electronic
correlation, it is exactly the transition metal oxides that will most likely
lead to observations of striking new phenomena under spatial confinement. I
will use perovskite manganites
as model systems to demonstrate how spatial confinement can dramatically affect
their transport and magnetic properties. The emerging magnetic and transport
behavior is likely associated with the electronic phase separation under
confined geometry in the manganites. Some of the new
properties such as ultrasharp jumps of magnetoresistance and reentrant metal-insulator transition
may have significant impact on fabricating oxides-based novel devices.