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 26.11.2009   Карта сайта     Language По-русски По-английски
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26.11.2009

Nature 462, 487-490 (26 November 2009) | doi:10.1038/nature08566; Received 19 June 2009; Accepted 7 October 2009



Two-dimensional normal-state quantum oscillations in a superconducting heterostructure


Y. Kozuka1,4, M. Kim1,4, C. Bell1,2, B. G. Kim1,3, Y. Hikita1 & H. Y. Hwang1,2




  1. Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan

  2. Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan

  3. Department of Physics, Pusan National University, Busan 609-735, South Korea

  4. These authors contributed equally to this work


Correspondence to: H. Y. Hwang1,2 Correspondence and requests for materials should be addressed to H.Y.H. (Email: hyhwang@k.u-tokyo.ac.jp).





Semiconductor heterostructures provide an ideal platform for studying high-mobility, low-density electrons in reduced dimensions1, 2, 3, 4. The realization of superconductivity in heavily doped diamond5, silicon6, silicon carbide7 and germanium8 suggests that Cooper pairs eventually may be directly incorporated in semiconductor heterostructures9, but these newly discovered superconductors are currently limited by their extremely large electronic disorder. Similarly, the electron mean free path in low-dimensional superconducting thin films is usually limited by interface scattering, in single-crystal or polycrystalline samples, or atomic-scale disorder, in amorphous materials, confining these examples to the extreme 'dirty limit'10. Here we report the fabrication of a high-quality superconducting layer within a thin-film heterostructure based on SrTiO3 (the first known superconducting semiconductor11). By selectively doping a narrow region of SrTiO3 with the electron-donor niobium, we form a superconductor that is two-dimensional, as probed by the anisotropy of the upper critical magnetic field. Unlike in previous examples, however, the electron mobility is high enough that the normal-state resistance exhibits Shubnikov–de Haas oscillations that scale with the perpendicular field, indicating two-dimensional states. These results suggest that delta-doped SrTiO3 provides a model system in which to explore the quantum transport and interplay12 of both superconducting and normal electrons. They also demonstrate that high-quality complex oxide heterostructures can maintain electron coherence on the macroscopic scales probed by transport, as well as on the microscopic scales demonstrated previously13.



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  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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