Photoemission from buried interfaces in SrTiO3/LaTiO3 superlattices

M. Takizawa; H. Wadati; K. Tanaka; M. Hashimoto; T. Yoshida; A. Fujimori; A. Chikamatsu; H. Kumigashira; M. Oshima; K. Shibuya; T. Mihara; T. Ohnishi; M. Lippmaa; M. Kawasaki; H. Koinuma; S. Okamoto; A. J. Millis

doi:10.1103/PhysRevLett.97.057601

Photoemission from buried interfaces in SrTiO3/LaTiO3 superlattices

M. Takizawa, H. Wadati, K. Tanaka, M. Hashimoto, T. Yoshida, A. Fujimori, A. Chikamatsu, H. Kumigashira, M. Oshima, K. Shibuya, T. Mihara, T. Ohnishi, M. Lippmaa, M. Kawasaki, H. Koinuma, S. Okamoto, A. J. Millis

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Abstract

We have measured photoemission spectra of SrTiO3/LaTiO3 superlattices with a topmost SrTiO3 layer of variable thickness. A finite coherent spectral weight with a clear Fermi cutoff was observed at chemically abrupt SrTiO3/LaTiO3 interfaces, indicating that an "electronic reconstruction" occurs at the interface between the Mott insulator LaTiO3 and the band insulator SrTiO3. For SrTiO3/LaTiO3 interfaces annealed at high temperatures (∼1000°C), which leads to Sr/La atomic interdiffusion and hence to the formation of La1-xSrxTiO3-like material, the intensity of the incoherent part was found to be dramatically reduced whereas the coherent part with a sharp Fermi cutoff was enhanced due to the spread of charge. These important experimental features are well reproduced by layer dynamical-mean-field-theory calculation.

Original language	English
Article number	057601
Journal	Physical review letters
Volume	97
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.97.057601
Publication status	Published - 2006
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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Takizawa, M., Wadati, H., Tanaka, K., Hashimoto, M., Yoshida, T., Fujimori, A., Chikamatsu, A., Kumigashira, H., Oshima, M., Shibuya, K., Mihara, T., Ohnishi, T., Lippmaa, M., Kawasaki, M., Koinuma, H., Okamoto, S., & Millis, A. J. (2006). Photoemission from buried interfaces in SrTiO3/LaTiO3 superlattices. Physical review letters, 97(5), [057601]. https://doi.org/10.1103/PhysRevLett.97.057601

Takizawa, M, Wadati, H, Tanaka, K, Hashimoto, M, Yoshida, T, Fujimori, A, Chikamatsu, A, Kumigashira, H, Oshima, M, Shibuya, K, Mihara, T, Ohnishi, T, Lippmaa, M, Kawasaki, M, Koinuma, H, Okamoto, S & Millis, AJ 2006, 'Photoemission from buried interfaces in SrTiO3/LaTiO3 superlattices', Physical review letters, vol. 97, no. 5, 057601. https://doi.org/10.1103/PhysRevLett.97.057601

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title = "Photoemission from buried interfaces in SrTiO3/LaTiO3 superlattices",

abstract = "We have measured photoemission spectra of SrTiO3/LaTiO3 superlattices with a topmost SrTiO3 layer of variable thickness. A finite coherent spectral weight with a clear Fermi cutoff was observed at chemically abrupt SrTiO3/LaTiO3 interfaces, indicating that an {"}electronic reconstruction{"} occurs at the interface between the Mott insulator LaTiO3 and the band insulator SrTiO3. For SrTiO3/LaTiO3 interfaces annealed at high temperatures (∼1000°C), which leads to Sr/La atomic interdiffusion and hence to the formation of La1-xSrxTiO3-like material, the intensity of the incoherent part was found to be dramatically reduced whereas the coherent part with a sharp Fermi cutoff was enhanced due to the spread of charge. These important experimental features are well reproduced by layer dynamical-mean-field-theory calculation.",

author = "M. Takizawa and H. Wadati and K. Tanaka and M. Hashimoto and T. Yoshida and A. Fujimori and A. Chikamatsu and H. Kumigashira and M. Oshima and K. Shibuya and T. Mihara and T. Ohnishi and M. Lippmaa and M. Kawasaki and H. Koinuma and S. Okamoto and Millis, {A. J.}",

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AU - Takizawa, M.

AU - Wadati, H.

AU - Tanaka, K.

AU - Hashimoto, M.

AU - Yoshida, T.

AU - Fujimori, A.

AU - Chikamatsu, A.

AU - Kumigashira, H.

AU - Oshima, M.

AU - Shibuya, K.

AU - Mihara, T.

AU - Ohnishi, T.

AU - Lippmaa, M.

AU - Kawasaki, M.

AU - Koinuma, H.

AU - Okamoto, S.

AU - Millis, A. J.

PY - 2006

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N2 - We have measured photoemission spectra of SrTiO3/LaTiO3 superlattices with a topmost SrTiO3 layer of variable thickness. A finite coherent spectral weight with a clear Fermi cutoff was observed at chemically abrupt SrTiO3/LaTiO3 interfaces, indicating that an "electronic reconstruction" occurs at the interface between the Mott insulator LaTiO3 and the band insulator SrTiO3. For SrTiO3/LaTiO3 interfaces annealed at high temperatures (∼1000°C), which leads to Sr/La atomic interdiffusion and hence to the formation of La1-xSrxTiO3-like material, the intensity of the incoherent part was found to be dramatically reduced whereas the coherent part with a sharp Fermi cutoff was enhanced due to the spread of charge. These important experimental features are well reproduced by layer dynamical-mean-field-theory calculation.

AB - We have measured photoemission spectra of SrTiO3/LaTiO3 superlattices with a topmost SrTiO3 layer of variable thickness. A finite coherent spectral weight with a clear Fermi cutoff was observed at chemically abrupt SrTiO3/LaTiO3 interfaces, indicating that an "electronic reconstruction" occurs at the interface between the Mott insulator LaTiO3 and the band insulator SrTiO3. For SrTiO3/LaTiO3 interfaces annealed at high temperatures (∼1000°C), which leads to Sr/La atomic interdiffusion and hence to the formation of La1-xSrxTiO3-like material, the intensity of the incoherent part was found to be dramatically reduced whereas the coherent part with a sharp Fermi cutoff was enhanced due to the spread of charge. These important experimental features are well reproduced by layer dynamical-mean-field-theory calculation.

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Photoemission from buried interfaces in SrTiO3/LaTiO3 superlattices

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