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3.0
Jun 30, 2018
06/18
Jun 30, 2018
by
Z. Q. Liu; L. Sun; Z. Huang; C. J. Li; S. W. Zeng; K. Han; W. M. Lü; T Venkatesan; Ariando
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We report that in unannealed LaAlO3/SrTiO3 (LAO/STO) heterostructures the critical thickness for the appearance of the two-dimensional electron gas can be less than 4 unit cell (uc), the interface is conducting even for STO substrates with mixed terminations and the low-temperature resistance upturn in LAO/STO heterostructures with thick LAO layers strongly depends on laser fluence. Our experimental results provide fundamental insights into the different roles played by oxygen vacancies and...
Topics: Materials Science, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1401.4991
61
61
Sep 21, 2013
09/13
Sep 21, 2013
by
Z. Q. Liu; W. M. Lü; X. Wang; Z. Huang; A. Annadi; S. W. Zeng; T. Venkatesan; Ariando
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We report novel magnetotransport properties of the low temperature Fermi liquid in SrTiO3-x single crystals. The classical limit dominates the magnetotransport properties for a magnetic field perpendicular to the sample surface and consequently a magnetic-field induced resistivity minimum emerges. While for the field applied in plane and normal to the current, the linear magnetoresistance (MR) starting from small fields ( < 0.5 T) appears. The large anisotropy in the transverse MRs reveals...
Source: http://arxiv.org/abs/1204.1901v1
52
52
Sep 20, 2013
09/13
Sep 20, 2013
by
S. W. Zeng; X. Wang; W. M. Lü; Z. Huang; M. Motapothula; Z. Q. Liu; Y. L. Zhao; A. Annadi; S. Dhar; H. Mao; W. Chen; T. Venkatesan; Ariando
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We report hole and electron doping in La-doped YBa$_2$Cu$_3$O$_y$(YBCO) thin films synthesized by pulsed laser deposition technique and subsequent \emph{in-situ} postannealing in oxygen ambient and vaccum. The $n$-type samples show a metallic behavior below the Mott limit and a high carrier density of $\sim2.8$ $\times$ 10$^{21}$ cm$^{-3}$ at room temperature (\emph{T}) at the optimally reduced condition. The in-plane resistivity ($\rho$$_{ab}$) of the $n$-type samples exhibits a quadratic...
Source: http://arxiv.org/abs/1207.5914v1
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67
Sep 18, 2013
09/13
Sep 18, 2013
by
Z. Q. Liu; D. P. Leusink; X. Wang; W. M. Lü; K. Gopinadhan; A. Annadi; Y. L. Zhao; X. H. Huang; S. W. Zeng; Z. Huang; A. Srivastava; S. Dhar; T. Venkatesan; Ariando
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We report the optical, electrical transport, and magnetotransport properties of high quality oxygen deficient SrTiO3 (STO) single crystal film fabricated by pulsed laser deposition and reduced in the vacuum chamber. The oxygen vacancy distribution in the thin film is expected to be uniform. By comparing the electrical properties with oxygen deficient bulk STO, it was found that the oxygen vacancies in bulk STO is far from uniform over the whole material. The metal-insulator transition (MIT)...
Source: http://arxiv.org/abs/1102.5595v2
72
72
Jul 19, 2013
07/13
Jul 19, 2013
by
L. M. Lui; T. W. Wong; W. Zeng; X. F. Gu; P. M. Thompson; T. F. Chan; S. T. Yau
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In shape analysis, finding an optimal 1-1 correspondence between surfaces within a large class of admissible bijective mappings is of great importance. Such process is called surface registration. The difficulty lies in the fact that the space of all surface diffeomorphisms is a complicated functional space, making exhaustive search for the best mapping challenging. To tackle this problem, we propose a simple representation of bijective surface maps using Beltrami coefficients (BCs), which are...
Source: http://arxiv.org/abs/1005.3292v1
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157
Jul 19, 2013
07/13
Jul 19, 2013
by
W. Zeng; L. M. Lui; F. Luo; J. S. Liu T. F. Chan; S. T. Yau; X. F. Gu
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Surface mapping plays an important role in geometric processing. They induce both area and angular distortions. If the angular distortion is bounded, the mapping is called a {\it quasi-conformal} map. Many surface maps in our physical world are quasi-conformal. The angular distortion of a quasi-conformal map can be represented by Beltrami differentials. According to quasi-conformal Teichm\"uller theory, there is an 1-1 correspondence between the set of Beltrami differentials and the set of...
Source: http://arxiv.org/abs/1005.4648v2