Volume 79, Number 5, September 2007
Article Number 57004
Number of page(s) 4
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 30 July 2007
EPL, 79 (2007) 57004
DOI: 10.1209/0295-5075/79/57004

A theoretical study on the transport property of the $\rm La_{0.7} Sr_{0.3} MnO_{3}/Si$ p-n heterojunction

Jie Qiu, Kui-juan Jin, Peng Han, Hui-bin Lu, Chun-lian Hu, Bao-ping Wang and Guo-zhen Yang

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academic of Sciences - Beijing 100080, China

received 8 June 2007; accepted in final form 6 July 2007; published September 2007
published online 30 July 2007

The transport property of the ${\rm La}_{0.7}{\rm Sr}_{03}{\rm MnO}_{3}/{\rm Si}$ heterostructure was investigated theoretically by applying the drift-diffusion model to the present system. A simple scenario of the semiconductor band and electric field at the interface region of the heterostructure with various bias voltages are presented. The good agreement between the self-consistent calculated results and the experimental data indicates that the proposed band picture is valid for the interpretation of the transport property of the p-n heterojunctions made of ${\rm La}_{0.7}{\rm Sr}_{0.3}{\rm MnO}_{3}$ and Si regardless of the complexity of the interface structures and multi-couplings among charge, spin, lattice and orbital of manganites.

73.40.Lq - Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions.
72.20.Dp - General theory, scattering mechanisms.
75.47.Lx - Manganites.

© Europhysics Letters Association 2007