Quantum electron transport through SrTiO3: Effects of dopants on conductance channel

Zhongchang Wang; Tsukimoto, Susumu; Saito, Mitsuhiro; Ikuhara, Yuichi
June 2009
Applied Physics Letters;6/22/2009, Vol. 94 Issue 25, p252103
Academic Journal
Combining nonequilibrium Green’s function technique with density functional theory, electronic structure and quantum transport of Pt–SrTiO3–Pt heterostructures are investigated with special focus on effects of dopants. We find that intrinsically closed conductance channel in SrTiO3 opens after doping substitutional atoms of higher valency for Sr or Ti, resulting in enhancement in electron transmission at Fermi level and drastic increase in current with bias. The switch of channel is suggested to be due to the redistribution of density of states on orbitals of channel atoms.


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