Fractionally δ-doped Oxide Superlattices for Higher Carrier Mobilities

Title
Fractionally δ-doped Oxide Superlattices for Higher Carrier Mobilities
Authors
Woo Seok Choi이수연Valentino R. CooperHo Nyung Lee
Keywords
Perovskite oxide 2DEG; pulse laser epitaxy; fractional superlattices; band-filling control; multichannel conduction; effective mass
Issue Date
2012-08
Publisher
Nano letters
Citation
VOL 12, 4590-4594
Abstract
A two-dimensional (2D) electron gas system in an oxide heterostructure serves as an important playground for novel phenomena. Here, we show that, by using fractional δ- doping to control the interface’s composition in LaxSr1−xTiO3/ SrTiO3 artificial oxide superlattices, the filling-controlled 2D insulator−metal transition can be realized. The atomic-scale control of d-electron band filling, which in turn contributes to the tuning of effective mass and density of the charge carriers, is found to be a fascinating route to substantially enhanced carrier mobilities.
URI
http://pubs.kist.re.kr/handle/201004/43448
ISSN
15306984
Appears in Collections:
KIST Publication > Article
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