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남지우,김동욱,배미영,박강순,김정현,노상률,최영일,김희종,장동욱,최소명,권영준,Hikita, S.,Yu, C.,Yoshimura, Y.,Kichimi, H. 성균관대학교 기초과학연구소 1998 論文集 Vol.49 No.-
We investigated the properties of BELLE Time Of Flight(TOF) counter using the data taken in Jan 98 beam test at Pi2 beam line at KEK 12 GeV proton synchrotron. Charge distributions from readout PMT were analysed in comparison with dE/dx distributions predicted by GEANT full simulation. Experimental setup of the beam test is described, then procedures of data analysis, Monte Carlo simulation and analysis results are also described.
Two-dimensional normal-state quantum oscillations in a superconducting heterostructure
Kozuka, Y.,Kim, M.,Bell, C.,Kim, B. G.,Hikita, Y.,Hwang, H. Y. Macmillan Publishers Limited. All rights reserved 2009 Nature Vol.462 No.7272
Semiconductor heterostructures provide an ideal platform for studying high-mobility, low-density electrons in reduced dimensions. The realization of superconductivity in heavily doped diamond, silicon, silicon carbide and germanium suggests that Cooper pairs eventually may be directly incorporated in semiconductor heterostructures, 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’. Here we report the fabrication of a high-quality superconducting layer within a thin-film heterostructure based on SrTiO<SUB>3</SUB> (the first known superconducting semiconductor). By selectively doping a narrow region of SrTiO<SUB>3</SUB> 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 SrTiO<SUB>3</SUB> provides a model system in which to explore the quantum transport and interplay 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 previously.