Optically excited multi-band conduction in LaAlO3/SrTiO 3 heterostructures

V. K. Guduru; A. Granados Del Aguila; S. Wenderich; M. K. Kruize; A. McCollam; P. C.M. Christianen; U. Zeitler; A. Brinkman; G. Rijnders; H. Hilgenkamp; J. C. Maan

doi:10.1063/1.4790844

Optically excited multi-band conduction in LaAlO₃/SrTiO ₃ heterostructures

V. K. Guduru
, A. Granados Del Aguila
, S. Wenderich
, M. K. Kruize
, A. McCollam
, P. C.M. Christianen
, U. Zeitler
, A. Brinkman
, G. Rijnders
, H. Hilgenkamp
, J. C. Maan

Research output: Contribution to journal › Article › peer-review

Abstract

The low-temperature resistance of a conducting LaAlO₃/SrTiO ₃ interface with a 10 nm LaAlO₃ film decreases by more than 50% after illumination with light of energy higher than the SrTiO ₃ band-gap. We explain our observations by optical excitation of an additional high mobility electron channel, which is spatially separated from the photo-excited holes. After illumination, we measure a strongly non-linear Hall resistance which is governed by the concentration and mobility of the photo-excited carriers. This can be explained within a two-carrier model where illumination creates a high mobility electron channel in addition to a low mobility electron channel which exists before illumination.

Original language	English
Article number	051604
Journal	Applied Physics Letters
Volume	102
Issue number	5
DOIs	https://doi.org/10.1063/1.4790844
Publication status	Published - 4 Feb 2013
Externally published	Yes

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title = "Optically excited multi-band conduction in LaAlO3/SrTiO 3 heterostructures",

abstract = "The low-temperature resistance of a conducting LaAlO3/SrTiO 3 interface with a 10 nm LaAlO3 film decreases by more than 50\% after illumination with light of energy higher than the SrTiO 3 band-gap. We explain our observations by optical excitation of an additional high mobility electron channel, which is spatially separated from the photo-excited holes. After illumination, we measure a strongly non-linear Hall resistance which is governed by the concentration and mobility of the photo-excited carriers. This can be explained within a two-carrier model where illumination creates a high mobility electron channel in addition to a low mobility electron channel which exists before illumination.",

author = "Guduru, \{V. K.\} and \{Granados Del Aguila\}, A. and S. Wenderich and Kruize, \{M. K.\} and A. McCollam and Christianen, \{P. C.M.\} and U. Zeitler and A. Brinkman and G. Rijnders and H. Hilgenkamp and Maan, \{J. C.\}",

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month = feb,

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doi = "10.1063/1.4790844",

language = "English",

volume = "102",

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T1 - Optically excited multi-band conduction in LaAlO3/SrTiO 3 heterostructures

AU - Guduru, V. K.

AU - Granados Del Aguila, A.

AU - Wenderich, S.

AU - Kruize, M. K.

AU - McCollam, A.

AU - Christianen, P. C.M.

AU - Zeitler, U.

AU - Brinkman, A.

AU - Rijnders, G.

AU - Hilgenkamp, H.

AU - Maan, J. C.

PY - 2013/2/4

Y1 - 2013/2/4

N2 - The low-temperature resistance of a conducting LaAlO3/SrTiO 3 interface with a 10 nm LaAlO3 film decreases by more than 50% after illumination with light of energy higher than the SrTiO 3 band-gap. We explain our observations by optical excitation of an additional high mobility electron channel, which is spatially separated from the photo-excited holes. After illumination, we measure a strongly non-linear Hall resistance which is governed by the concentration and mobility of the photo-excited carriers. This can be explained within a two-carrier model where illumination creates a high mobility electron channel in addition to a low mobility electron channel which exists before illumination.

AB - The low-temperature resistance of a conducting LaAlO3/SrTiO 3 interface with a 10 nm LaAlO3 film decreases by more than 50% after illumination with light of energy higher than the SrTiO 3 band-gap. We explain our observations by optical excitation of an additional high mobility electron channel, which is spatially separated from the photo-excited holes. After illumination, we measure a strongly non-linear Hall resistance which is governed by the concentration and mobility of the photo-excited carriers. This can be explained within a two-carrier model where illumination creates a high mobility electron channel in addition to a low mobility electron channel which exists before illumination.

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DO - 10.1063/1.4790844

M3 - Article

AN - SCOPUS:84874042716

SN - 0003-6951

VL - 102

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 5

M1 - 051604

ER -

Optically excited multi-band conduction in LaAlO₃/SrTiO ₃ heterostructures

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