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  • 1
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    Magnons in a two-dimensional transverse-field XXZ model (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-07-20
    Description: Author(s): Satyaki Kar, Keola Wierschem, and Pinaki Sengupta The XXZ model on a square lattice in the presence of a transverse magnetic field is studied within the spin-wave theory to investigate the resulting canted antiferromagnet. The small- and large-field regimes are probed separately both for easy-axis and easy-plane scenarios which reveal an unentangle... [Phys. Rev. B 96, 045126] Published Wed Jul 19, 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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  • 2
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    From semilocal density functionals to random phase approximation renormalized perturbation theory: A methodological assessment of structural phase transitions (2018)
    American Physical Society (APS)
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    Publication Date: 2018-06-21
    Description: Author(s): Niladri Sengupta, Jefferson E. Bates, and Adrienn Ruzsinszky The structural phase transitions of different materials, including metal to metal, metal to semiconductor, and semiconductor to semiconductor transitions, were explored using methods based on the random phase approximation. Transition pressures for Si, Ge, SiC, GaAs, SiO 2 , Pb, C, and BN from their s... [Phys. Rev. B 97, 235136] Published Wed Jun 20, 2018
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 3
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    Tuning towards dynamic freezing using a two-rate protocol (2016)
    American Physical Society (APS)
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    Publication Date: 2016-08-17
    Description: Author(s): Satyaki Kar, Bhaskar Mukherjee, and K. Sengupta We study periodically driven closed quantum systems where two parameters of the system Hamiltonian are varied periodically in time with frequencies ω 1 and ω 2 = r ω 1 . We show that such drives may be used to tune towards dynamics-induced freezing where the wave function of the state of the system after a… [Phys. Rev. B 94, 075130] Published Tue Aug 16, 2016
    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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  • 4
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    Signatures and conditions for phase band crossings in periodically driven integrable systems (2016)
    American Physical Society (APS)
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    Publication Date: 2016-10-14
    Description: Author(s): Bhaskar Mukherjee, Arnab Sen, Diptiman Sen, and K. Sengupta We present generic conditions for phase band crossings for a class of periodically driven integrable systems represented by free fermionic models subjected to arbitrary periodic drive protocols characterized by a frequency ω D . These models provide a representation for the Ising and X Y models in d = 1 ,… [Phys. Rev. B 94, 155122] Published Thu Oct 13, 2016
    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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  • 5
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    Detecting Exomoons Around Self-Luminous Giant Exoplanets Through Polarization (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Many of the directly imaged self-luminous gas giant exoplanets have been found to have cloudy atmo- spheres. Scattering of the emergent thermal radiation from these planets by the dust grains in their atmospheres should locally give rise to significant linear polarization of the emitted radiation. However, the observable disk averaged polarization should be zero if the planet is spherically symmetric. Rotation-induced oblateness may yield a net non-zero disk averaged polarization if the planets have sufficiently high spin rotation velocity. On the other hand, when a large natural satellite or exomoon transits a planet with cloudy atmosphere along the line of sight, the asymmetry induced during the transit should give rise to a net non-zero, time resolved linear polarization signal. The peak amplitude of such time dependent polarization may be detectable even for slowly rotating exoplanets. Therefore, we suggest that large exomoons around directly imaged self-luminous exoplanets may be detectable through time resolved imaging polarimetry. Adopting detailed atmospheric models for several values of effective temperature and surface gravity which are appropriate for self-luminous exoplanets, we present the polarization profiles of these objects in the infrared during transit phase and estimate the peak amplitude of polarization that occurs during the the inner contacts of the transit ingress/egress phase. The peak polarization is predicted to range between 0.1 and 0.3 % in the infrared.
    Keywords: Astronomy
    Type: ARC-E-DAA-TN31589 , The Astrophysical Journal (ISSN 0004-637X) (e-ISSN 1538-4357); 824; 2; 76
    Format: application/pdf
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