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Andreas Hackl

    Quantum criticality and non-equilibrium dynamics in correlated electron systems
    The Invisible Palestinians
    • The Invisible Palestinians

      • 256 Seiten
      • 9 Lesestunden
      4,5(8)Abgeben

      Within the heart of the Jewish city of Tel Aviv, there is a hidden reality--Palestinians who work, study, and live as an unseen minority without access to equal urban citizenship. Grounded in the everyday lives of Palestinians in Tel Aviv, The Invisible Palestinians offers an ethnographic critique of the city's self-proclaimed openness and liberalism. Andreas Hackl reveals that Palestinians' access to the social and economic opportunities afforded in Tel Aviv depends on an invisibility that not only disrupts opportunities for true urban citizenship but also draws opposition from other Palestinians. They are unable to belong in Tel Aviv as Palestinians and unable to reconcile Tel Aviv with being Palestinian. By looking at the city from the perspective of the hidden citizens, Hackl uncovers a critical opportunity to imagine and build a more inclusive and just future for Tel Aviv. An important read, The Invisible Palestinians explores the lives of Palestinian workers, middle class professionals, students, activists, and members of an underground LGBT community in Tel Aviv as they seek to navigate their place in a city that refuses to see them.

      The Invisible Palestinians
    • In this thesis, several cases of non-equilibrium phenomena and quantum phase transitions in strongly correlated electron systems are analyzed. The unconventional critical behavior near magnetic quantum phase transitions in various heavy-fermion metals has triggered proposals on the breakdown of the Kondo effect at the critical point. In part I, we investigate, within one specific scenario, the fate of such a zero-temperature transition upon coupling of the electronic to lattice degrees of freedom. We study a Kondo-Heisenberg model with volume-dependent Kondo coupling - this model displays both Kondo volume collapse and Kondo-breakdown transitions. Within a large N treatment, we find that the Kondo breakdown transition remains of second order except for very soft lattices. Finally, we relate our findings to current heavy-fermion experiments. Using non-equilibrium Green's functions, we derive transport equations for the degrees of freedom participating in the quantum critical region of the Kondo breakdown transition. We discuss conditions under which the transport of electrical charge is described by the independent motion of conduction electrons and auxiliary bosons. Under these conditions, we derive a semiclassical transport equation for the bosons and quantitatively discuss the electrical conductivity of the whole system.

      Quantum criticality and non-equilibrium dynamics in correlated electron systems