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  • Astronomy  (2)
  • Electronic structure and strongly correlated systems  (1)
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  • 1
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    Manipulation of type-I and type-II Dirac points in PdTe_{2} superconductor by external pressure (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-08-04
    Description: Author(s): R. C. Xiao, P. L. Gong, Q. S. Wu, W. J. Lu, M. J. Wei, J. Y. Li, H. Y. Lv, X. Luo, P. Tong, X. B. Zhu, and Y. P. Sun A pair of type-II Dirac cones in PdTe 2 was recently predicted by theories and confirmed in experiments, making PdTe 2 the first material that processes both superconductivity and type-II Dirac fermions. In this paper, we study the evolution of Dirac cones in PdTe 2 under hydrostatic pressure by first-... [Phys. Rev. B 96, 075101] Published Tue Aug 01, 2017
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
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    The Design and Capabilities of the EXIST Optical and Infra-Red Telescope (IRT) (2010)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Infra-Red Telescope is a critical element of the EXIST (Energetic X-Ray Imaging Survey Telescope) observatory. The primary goal of the IRT is to obtain photometric and spectroscopic measurements of high redshift (〉 or =6) gamma ray reaching to the epoque of reionization. The photometric and spectral capabilities of the IRT will allow to use GRB afterglow as probes of the composition and ionization state of the intergalactic medium of the young universe. A prompt follow up (within three minutes) of the transient discovered by the EXIST makes IRT a unique tool for detection and study of these events in the infrared and optical wavelength, which is particularly valuable at wavelengths unavailable to the ground based observatories. We present the results of the mission study development on the IRT as part of the EXIST observatory. Keywords: infrared spectroscopy, space telescope, gamma ray bursts, early universe
    Keywords: Astronomy
    Type: GSFC.CPR.4928.2011 , SPIE 7731 Proceedings Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave; Jun 27, 2010 - Jul 02, 2010; Greenbelt, MD; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    ATLAST-9.2: A Deployable Large Aperture UVOIR Space Telescope (2010)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: We present the results of a study of a deployable version of the Advanced Technology Large Aperture Space Telescope (ATLAST) that could be launched on an Evolved Expendable Launch Vehicle (EELV). ATLAST is a concept for a next-generation UVOIR observatory to follow HST and JWST. The observatory retains significant heritage from JWST, thereby taking advantage of technologies and engineering already developed for that mission. At the same time, we have identified several design changes to the JWST architecture, some of which are required due to the demanding wavefront error requirements at visible wavelengths. The optical telescope assembly has a segmented 9.2-meter aperture and consists of 36 hexagonal glass mirrors, each of which is I.3l5m in size (flat-to-flat). The telescope can be folded to fit in the 6.5m fairing on the planned upgrade to the Delta-IV heavy launch vehicle. Near-real time wavefront sensing and control is performed on-board the telescope using stars in the field of view to deliver diffraction limited imaging performance at 500nm wavelength. The optical design of the telescope provides an 8x20 arcmin FOV in which 4-5 instruments can be accommodated, plus fine guidance and wavefront sensors. Unlike JWST, the OTA sits at the end of a multi-gimbaled arm, allowing pitch and roll motion, and is isolated from the sunshield and spacecraft bus by an active isolation system. Our design permits servicing in order to extend the life of the observatory.
    Keywords: Astronomy
    Type: 215th American Astronomical Society Conference; Jan 03, 2010 - Jan 07, 2010; Washington, DC; United States
    Format: text
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    NASA TECHNICAL REPORTS
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