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Identifier 000427564
Title Ultrafast spin-charge quantum dynamics in strongly correlated systems
Alternative Title Υπερταχεία κβαντική δυναμική σπιν-φορτίου σε ισχυρά συσχετιζόμενα συστήματα
Author Λίγγος, Παναγιώτης
Thesis advisor Περάκης, Ηλίας
Abstract In this thesis we investigate the possible role in a non-equilibrium phase transition of non-thermal fs dynamics of electronic, magnetic, and lattice coupled degrees of freedom within a theoretical framework based on Hubbard operators that treats the magnetic exchange interaction at the microscopic level. We propose a possible mechanism for photoinduced phase transition based on the interplay between a quasi-instantaneous electronic/magnetic pathway and a delayed lattice pathway. In particular, we discuss the possibility that the excitation of composite fermion itinerant quasi-particles dressed by spin fluctuations triggers quasi- instantaneously an insulator to metal and AFM to FM phase transition by providing time-dependent numerical results based on real-space models by solving the quantum kinetic equations of motion. We examine in the role of spin fluctuations driven by photo-carrier populations that interact with a deformable spin and lattice medium. We also discuss the role of the quasi-particle energy bands, modified by fs laser excitation, which arise from electron-magnon coupling and the strong Hund’s rule local interaction.
Language English
Subject Insulator-metal transition
Photoinduced spin dynamics
Δυναμική σπιν φεμτοδευτερολέπτων
Issue date 2020-01-20
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Physics--Doctoral theses
  Type of Work--Doctoral theses
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