17,002 research outputs found
Landauer transport model for Hawking radiation from a Reissner-Nordstrom black hole
The recent work of Nation et al in which Hawking radiation energy and entropy
flow from a black hole can be regarded as a one-dimensional (1D) Landauer
transport process is extended to the case of a Reissner-Nordstrom (RN) black
hole. It is found that the flow of charge current can also be transported via a
1D quantum channel except the current of Hawking radiation. The maximum entropy
current, which is shown to be particle statistics independence, is also
obtained
Carrier freeze-out induced metal-insulator transition in oxygen deficient SrTiO3 films
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) observed in the oxygen deficient STO film was
found to be induced by the carrier freeze-out effect. The low temperature
frozen state can be re-excited by an electric field, Joule heating, and
surprisingly also a large magnetic field.Comment: 5 pages, 5 figure
Magnetic-field induced resistivity minimum with in-plane linear magnetoresistance of the Fermi liquid in SrTiO3-x single crystals
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 the strong surface interlayer
scattering due to the large gradient of oxygen vacancy concentration from the
surface to the interior of SrTiO3-x single crystals. Moreover, the linear MR in
our case was likely due to the inhomogeneity of oxygen vacancies and oxygen
vacancy clusters, which could provide experimental evidences for the unusual
quantum linear MR proposed by Abrikosov [A. A. Abrikosov, Phys. Rev. B 58, 2788
(1998)].Comment: 5 pages, 4 figure
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