Optical study of the free-carrier response of LaTiO3/SrTiO3 superlattices

S. S.A. Seo; W. S. Choi; H. N. Lee; L. Yu; K. W. Kim; C. Bernhard; T. W. Noh

doi:10.1103/PhysRevLett.99.266801

Optical study of the free-carrier response of LaTiO3/SrTiO3 superlattices

S. S.A. Seo, W. S. Choi, H. N. Lee, L. Yu, K. W. Kim, C. Bernhard, T. W. Noh

Materials Science and Technology Div

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

67 Scopus citations

Abstract

We used infrared spectroscopic ellipsometry to investigate the electronic properties of LaTiO3/SrTiO3 superlattices (SLs). Our results indicated that, independent of the SL periodicity and individual layer thickness, the SLs exhibited a Drude metallic response with sheet carrier density per interface ≈3×1014cm-2. This is probably due to the leakage of d electrons at interfaces from the Mott insulator LaTiO3 to the band insulator SrTiO3. We observed a carrier relaxation time ≈35fs and mobility ≈35cm2V-1s-1 at 10 K, and an unusual temperature dependence of carrier density that was attributed to the dielectric screening of quantum paraelectric SrTiO3.

Original language	English
Article number	266801
Journal	Physical Review Letters
Volume	99
Issue number	26
DOIs	https://doi.org/10.1103/PhysRevLett.99.266801
State	Published - Dec 26 2007

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title = "Optical study of the free-carrier response of LaTiO3/SrTiO3 superlattices",

abstract = "We used infrared spectroscopic ellipsometry to investigate the electronic properties of LaTiO3/SrTiO3 superlattices (SLs). Our results indicated that, independent of the SL periodicity and individual layer thickness, the SLs exhibited a Drude metallic response with sheet carrier density per interface ≈3×1014cm-2. This is probably due to the leakage of d electrons at interfaces from the Mott insulator LaTiO3 to the band insulator SrTiO3. We observed a carrier relaxation time ≈35fs and mobility ≈35cm2V-1s-1 at 10 K, and an unusual temperature dependence of carrier density that was attributed to the dielectric screening of quantum paraelectric SrTiO3.",

author = "Seo, {S. S.A.} and Choi, {W. S.} and Lee, {H. N.} and L. Yu and Kim, {K. W.} and C. Bernhard and Noh, {T. W.}",

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T1 - Optical study of the free-carrier response of LaTiO3/SrTiO3 superlattices

AU - Seo, S. S.A.

AU - Choi, W. S.

AU - Lee, H. N.

AU - Yu, L.

AU - Kim, K. W.

AU - Bernhard, C.

AU - Noh, T. W.

PY - 2007/12/26

Y1 - 2007/12/26

N2 - We used infrared spectroscopic ellipsometry to investigate the electronic properties of LaTiO3/SrTiO3 superlattices (SLs). Our results indicated that, independent of the SL periodicity and individual layer thickness, the SLs exhibited a Drude metallic response with sheet carrier density per interface ≈3×1014cm-2. This is probably due to the leakage of d electrons at interfaces from the Mott insulator LaTiO3 to the band insulator SrTiO3. We observed a carrier relaxation time ≈35fs and mobility ≈35cm2V-1s-1 at 10 K, and an unusual temperature dependence of carrier density that was attributed to the dielectric screening of quantum paraelectric SrTiO3.

AB - We used infrared spectroscopic ellipsometry to investigate the electronic properties of LaTiO3/SrTiO3 superlattices (SLs). Our results indicated that, independent of the SL periodicity and individual layer thickness, the SLs exhibited a Drude metallic response with sheet carrier density per interface ≈3×1014cm-2. This is probably due to the leakage of d electrons at interfaces from the Mott insulator LaTiO3 to the band insulator SrTiO3. We observed a carrier relaxation time ≈35fs and mobility ≈35cm2V-1s-1 at 10 K, and an unusual temperature dependence of carrier density that was attributed to the dielectric screening of quantum paraelectric SrTiO3.

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DO - 10.1103/PhysRevLett.99.266801

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Optical study of the free-carrier response of LaTiO3/SrTiO3 superlattices

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