TY - JOUR
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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U2 - 10.1103/PhysRevLett.99.266801
DO - 10.1103/PhysRevLett.99.266801
M3 - Article
AN - SCOPUS:37649005660
SN - 0031-9007
VL - 99
JO - Physical Review Letters
JF - Physical Review Letters
IS - 26
M1 - 266801
ER -