Anisotropic two dimensional electron gas at the LaAlO3/SrTiO3(110) interface

A. Annadi, X. Renshaw Wang, K. Gopinadhan, W.M. Lü, A. Roy Barman, Z.Q. Liu, A. Srivastava, S. Saha, Y.L. Zhao, S.W. Zeng, S. Dhar, N. Tuzla, E. Olsson, Q. (Qiaohui) Zhang, B. Gu, S. Yunoki, S. Maekawa, H. Hilgenkamp, T. Venkatesan, A. AriandoX. Renshaw Wang

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Abstract

The observation of a high-mobility two-dimensional electron gas between two insulating complex oxides, especially LaAlO3/SrTiO3, has enhanced the potential of oxides for electronics. The occurrence of this conductivity is believed to be driven by polarization discontinuity, leading to an electronic reconstruction. In this scenario, the crystal orientation has an important role and no conductivity would be expected, for example, for the interface between LaAlO3 and (110)-oriented SrTiO3, which should not have a polarization discontinuity. Here we report the observation of unexpected conductivity at the LaAlO3/SrTiO3 interface prepared on (110)-oriented SrTiO3, with a LaAlO3-layer thickness-dependent metal-insulator transition. Density functional theory calculation reveals that electronic reconstruction, and thus conductivity, is still possible at this (110) interface by considering the energetically favourable (110) interface structure, that is, buckled TiO2/LaO, in which the polarization discontinuity is still present. The conductivity was further found to be strongly anisotropic along the different crystallographic directions with potential for anisotropic superconductivity and magnetism, leading to possible new physics and applications.
Original languageEnglish
Article number1838
Pages (from-to)1838-1-1838-7
Number of pages7
JournalNature communications
Volume4
Issue number1838
DOIs
Publication statusPublished - 2013

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Two dimensional electron gas
electron gas
Gases
Electrons
conductivity
Polarization
discontinuity
Oxides
Observation
polarization
Metal insulator transition
electronics
Physics
Magnetism
Superconductivity
Crystal orientation
oxides
Density functional theory
Electronic equipment
Metals

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Annadi, A., Wang, X. R., Gopinadhan, K., Lü, W. M., Roy Barman, A., Liu, Z. Q., ... Renshaw Wang, X. (2013). Anisotropic two dimensional electron gas at the LaAlO3/SrTiO3(110) interface. Nature communications, 4(1838), 1838-1-1838-7. [1838]. https://doi.org/10.1038/ncomms2804
Annadi, A. ; Wang, X. Renshaw ; Gopinadhan, K. ; Lü, W.M. ; Roy Barman, A. ; Liu, Z.Q. ; Srivastava, A. ; Saha, S. ; Zhao, Y.L. ; Zeng, S.W. ; Dhar, S. ; Tuzla, N. ; Olsson, E. ; Zhang, Q. (Qiaohui) ; Gu, B. ; Yunoki, S. ; Maekawa, S. ; Hilgenkamp, H. ; Venkatesan, T. ; Ariando, A. ; Renshaw Wang, X. / Anisotropic two dimensional electron gas at the LaAlO3/SrTiO3(110) interface. In: Nature communications. 2013 ; Vol. 4, No. 1838. pp. 1838-1-1838-7.
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abstract = "The observation of a high-mobility two-dimensional electron gas between two insulating complex oxides, especially LaAlO3/SrTiO3, has enhanced the potential of oxides for electronics. The occurrence of this conductivity is believed to be driven by polarization discontinuity, leading to an electronic reconstruction. In this scenario, the crystal orientation has an important role and no conductivity would be expected, for example, for the interface between LaAlO3 and (110)-oriented SrTiO3, which should not have a polarization discontinuity. Here we report the observation of unexpected conductivity at the LaAlO3/SrTiO3 interface prepared on (110)-oriented SrTiO3, with a LaAlO3-layer thickness-dependent metal-insulator transition. Density functional theory calculation reveals that electronic reconstruction, and thus conductivity, is still possible at this (110) interface by considering the energetically favourable (110) interface structure, that is, buckled TiO2/LaO, in which the polarization discontinuity is still present. The conductivity was further found to be strongly anisotropic along the different crystallographic directions with potential for anisotropic superconductivity and magnetism, leading to possible new physics and applications.",
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language = "English",
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Annadi, A, Wang, XR, Gopinadhan, K, Lü, WM, Roy Barman, A, Liu, ZQ, Srivastava, A, Saha, S, Zhao, YL, Zeng, SW, Dhar, S, Tuzla, N, Olsson, E, Zhang, QQ, Gu, B, Yunoki, S, Maekawa, S, Hilgenkamp, H, Venkatesan, T, Ariando, A & Renshaw Wang, X 2013, 'Anisotropic two dimensional electron gas at the LaAlO3/SrTiO3(110) interface', Nature communications, vol. 4, no. 1838, 1838, pp. 1838-1-1838-7. https://doi.org/10.1038/ncomms2804

Anisotropic two dimensional electron gas at the LaAlO3/SrTiO3(110) interface. / Annadi, A.; Wang, X. Renshaw; Gopinadhan, K.; Lü, W.M.; Roy Barman, A.; Liu, Z.Q.; Srivastava, A.; Saha, S.; Zhao, Y.L.; Zeng, S.W.; Dhar, S.; Tuzla, N.; Olsson, E.; Zhang, Q. (Qiaohui); Gu, B.; Yunoki, S.; Maekawa, S.; Hilgenkamp, H.; Venkatesan, T.; Ariando, A.; Renshaw Wang, X.

In: Nature communications, Vol. 4, No. 1838, 1838, 2013, p. 1838-1-1838-7.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Anisotropic two dimensional electron gas at the LaAlO3/SrTiO3(110) interface

AU - Annadi, A.

AU - Wang, X. Renshaw

AU - Gopinadhan, K.

AU - Lü, W.M.

AU - Roy Barman, A.

AU - Liu, Z.Q.

AU - Srivastava, A.

AU - Saha, S.

AU - Zhao, Y.L.

AU - Zeng, S.W.

AU - Dhar, S.

AU - Tuzla, N.

AU - Olsson, E.

AU - Zhang, Q. (Qiaohui)

AU - Gu, B.

AU - Yunoki, S.

AU - Maekawa, S.

AU - Hilgenkamp, H.

AU - Venkatesan, T.

AU - Ariando, A.

AU - Renshaw Wang, X.

PY - 2013

Y1 - 2013

N2 - The observation of a high-mobility two-dimensional electron gas between two insulating complex oxides, especially LaAlO3/SrTiO3, has enhanced the potential of oxides for electronics. The occurrence of this conductivity is believed to be driven by polarization discontinuity, leading to an electronic reconstruction. In this scenario, the crystal orientation has an important role and no conductivity would be expected, for example, for the interface between LaAlO3 and (110)-oriented SrTiO3, which should not have a polarization discontinuity. Here we report the observation of unexpected conductivity at the LaAlO3/SrTiO3 interface prepared on (110)-oriented SrTiO3, with a LaAlO3-layer thickness-dependent metal-insulator transition. Density functional theory calculation reveals that electronic reconstruction, and thus conductivity, is still possible at this (110) interface by considering the energetically favourable (110) interface structure, that is, buckled TiO2/LaO, in which the polarization discontinuity is still present. The conductivity was further found to be strongly anisotropic along the different crystallographic directions with potential for anisotropic superconductivity and magnetism, leading to possible new physics and applications.

AB - The observation of a high-mobility two-dimensional electron gas between two insulating complex oxides, especially LaAlO3/SrTiO3, has enhanced the potential of oxides for electronics. The occurrence of this conductivity is believed to be driven by polarization discontinuity, leading to an electronic reconstruction. In this scenario, the crystal orientation has an important role and no conductivity would be expected, for example, for the interface between LaAlO3 and (110)-oriented SrTiO3, which should not have a polarization discontinuity. Here we report the observation of unexpected conductivity at the LaAlO3/SrTiO3 interface prepared on (110)-oriented SrTiO3, with a LaAlO3-layer thickness-dependent metal-insulator transition. Density functional theory calculation reveals that electronic reconstruction, and thus conductivity, is still possible at this (110) interface by considering the energetically favourable (110) interface structure, that is, buckled TiO2/LaO, in which the polarization discontinuity is still present. The conductivity was further found to be strongly anisotropic along the different crystallographic directions with potential for anisotropic superconductivity and magnetism, leading to possible new physics and applications.

U2 - 10.1038/ncomms2804

DO - 10.1038/ncomms2804

M3 - Article

VL - 4

SP - 1838-1-1838-7

JO - Nature communications

JF - Nature communications

SN - 2041-1723

IS - 1838

M1 - 1838

ER -

Annadi A, Wang XR, Gopinadhan K, Lü WM, Roy Barman A, Liu ZQ et al. Anisotropic two dimensional electron gas at the LaAlO3/SrTiO3(110) interface. Nature communications. 2013;4(1838):1838-1-1838-7. 1838. https://doi.org/10.1038/ncomms2804