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  • 1
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    Destruction of string order after a quantum quench (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-07-06
    Description: Author(s): Marcello Calvanese Strinati, Leonardo Mazza, Manuel Endres, Davide Rossini, and Rosario Fazio We investigate the evolution of string order in a spin-1 chain following a quantum quench. After initializing the chain in the Affleck-Kennedy-Lieb-Tasaki state, we analyze in detail how string order evolves as a function of time at different length scales. The Hamiltonian after the quench is chosen… [Phys. Rev. B 94, 024302] Published Tue Jul 05, 2016
    Keywords: Dynamics, dynamical systems, lattice effects
    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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    Out-of-equilibrium dynamics and thermalization of string order (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-07-12
    Description: Author(s): Leonardo Mazza, Davide Rossini, Manuel Endres, and Rosario Fazio We investigate the equilibration dynamics of string order in one-dimensional quantum systems. After initializing a spin-1 chain in the Haldane phase, the time evolution of nonlocal correlations following a sudden quench is studied by means of matrix-product-state-based algorithms. Thermalization occ... [Phys. Rev. B 90, 020301] Published Fri Jul 11, 2014
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Scrambling and entanglement spreading in long-range spin chains (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-10-09
    Description: Author(s): Silvia Pappalardi, Angelo Russomanno, Bojan Žunkovič, Fernando Iemini, Alessandro Silva, and Rosario Fazio We study scrambling in connection with multipartite entanglement dynamics in regular and chaotic long-range spin chains, characterized by a well-defined semi-classical limit. For regular dynamics, scrambling and entanglement dynamics are found to be very different: up to the Ehrenfest time, they ris... [Phys. Rev. B 98, 134303] Published Mon Oct 08, 2018
    Keywords: Dynamics, dynamical systems, lattice effects
    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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    Density of states of many-body quantum systems from tensor networks (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-09-07
    Description: Author(s): Fabian Schrodi, Pietro Silvi, Ferdinand Tschirsich, Rosario Fazio, and Simone Montangero We present a technique to compute the microcanonical thermodynamical properties of a many-body quantum system using tensor networks. The density of States, and more general spectral properties, are evaluated by means of a Hubbard-Stratonovich transformation performed on top of a real-time evolution,... [Phys. Rev. B 96, 094303] Published Wed Sep 06, 2017
    Keywords: Dynamics, dynamical systems, lattice effects
    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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    Floquet time crystal in the Lipkin-Meshkov-Glick model (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-06-24
    Description: Author(s): Angelo Russomanno, Fernando Iemini, Marcello Dalmonte, and Rosario Fazio In this work we discuss the existence of time-translation symmetry breaking in a kicked infinite-range-interacting clean spin system described by the Lipkin-Meshkov-Glick model. This Floquet time crystal is robust under perturbations of the kicking protocol, its existence being intimately linked to ... [Phys. Rev. B 95, 214307] Published Thu Jun 22, 2017
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Dissipative Landau-Zener problem and thermally assisted Quantum Annealing (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-08-04
    Description: Author(s): Luca Arceci, Simone Barbarino, Rosario Fazio, and Giuseppe E. Santoro We revisit here the issue of thermally assisted Quantum Annealing by a detailed study of the dissipative Landau-Zener problem in the presence of a Caldeira-Leggett bath of harmonic oscillators, using both a weak-coupling quantum master equation and a quasiadiabatic path-integral approach. Building o... [Phys. Rev. B 96, 054301] Published Tue Aug 01, 2017
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    Green Propulsion Technologies for Advanced Air Transports (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Air transportation is critical to U.S. and Global economic vitality. However, energy and climate issues challenge aviations ability to be sustainable in the long term. Aviation must dramatically reduce fuel use and related emissions. Energy costs to U.S. airlines nearly tripled between 1995 and 2011, and continue to be the highest percentage of operating costs. The NASA Advanced Air Transports Technology Project addresses the comprehensive challenge of enabling revolutionary energy efficiency improvements in subsonic transport aircraft combined with dramatic reductions in harmful emissions and perceived noise to facilitate sustained growth of the air transportation system. Advanced technologies and the development of unconventional aircraft systems offer the potential to achieve these improvements. The presentation will highlight the NASA vision of revolutionary systems and propulsion technologies needed to achieve these challenging goals. Specifically, the primary focus is on the N+3 generation; that is, vehicles that are three generations beyond the current state of the art, requiring mature technology solutions in the 2025-30 timeframe, which are envisioned as being powered by Hybrid Electric Propulsion Systems.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN23468 , AIAA Distinguished Lectureship; May 12, 2015; Cleveland, OH; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Electrified Aircraft Propulsion Development (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The benefits of electrified aircraft propulsion improves aircrafts like single aisle transports, enables new configurations of vertical take-off landing aircrafts and revitalizes the economic case for small short-range aircraft services. Future strategies and markets for supersonic and commercial transport are proposed.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN58749 , AIAA Propulsion & Energy Forum; Jul 09, 2018 - Jul 11, 2018; Cincinnati, OH; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Green Propulsion Technologies for Advanced Air Transports (2015)
    In:  CASI
    Details
    Publication Date: 2019-09-20
    Description: Air transportation is critical to U.S. and Global economic vitality. However, energy and climate issues challenge aviation's ability to be sustainable in the long term. Aviation must dramatically reduce fuel use and related emissions. Energy costs to U.S. airlines nearly tripled between 1995 and 2011, and continue to be the highest percentage of operating costs. The NASA Advanced Air Transports Technology Project addresses the comprehensive challenge of enabling revolutionary energy efficiency improvements in subsonic transport aircraft combined with dramatic reductions in harmful emissions and perceived noise to facilitate sustained growth of the air transportation system. Advanced technologies and the development of unconventional aircraft systems offer the potential to achieve these improvements. The presentation will highlight the NASA vision of revolutionary systems and propulsion technologies needed to achieve these challenging goals. Specifically, the primary focus is on the N+3 generation; that is, vehicles that are three generations beyond the current state of the art, requiring mature technology solutions in the 2025-30 timeframe.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN20707 , OSU Aerospace Graduate Student Seminar; Jan 30, 2015; Columbus, OH; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    NASA Green Propulsion Technologies Pushing Aviation to New Heights (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Center Director Free is providing the Keynote at the Disruptive Propulsion Conference, sponsored by Cranfield University, Cranfield, Bedfordshire, England in November. Director Free will be presenting a PowerPoint presentation titled, NASA Green Propulsion Technologies Pushing Aviation to New Heights at both the conference and a meeting at the Royal Aeronautical Society.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN18619 , Disruptive Green Propulsion Technologies-Beyond the Competitive Horizon; Nov 17, 2014 - Nov 18, 2014; London; United Kingdom
    Format: application/pdf
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