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Sanjoy Saker

noviembre 22, 2018 @ 2:30 pm - 4:00 pm

Evento Navegación

Lugar: Seminario de Física Teórica, planta 3
Día: Jueves 22 de noviembre

Ponente: Sanjoy Saker, University of Alabama

Título:  Spin-Charge Split paring mechanism for high-Tc superconductors: Experimental Support

Abstract: The metallic phase of a conventional superconductor is a Fermi liquid, characterized by electron quasiparticles, which form Cooper pairs leading to BCS superconductivity.   Anderson argued (1987) that high-Tc superconductors are different. In that spin and charge are carried by separate excitations, in these doped Mott insulators.  We discuss recent theoretical developments which have shown that a spin-charge separated state emerges if a) the parent (t-J) model is properly renormalized and b) the spin part of the metallic phase is continuously connected to the corresponding state of Mott insulator (undoped).  The renormalization also reveals a novel spin-charge split pairing mechanism which is hidden in the parent model.  The Cooper pair is replaced by a composite object, chargeless spins are paired into singlets forming a BCS like state, which evolves from the Mott insulator below a temperature T*.  Spinless holes, carrying charge +e, are (real-space) paired to form propagating bosons which are gauge coupled to the spin singlets.  Superconductivity occurs via Bose-Einstein condensation (BEC) below a temperature Tc < T*.  The theory reproduces the observed phases at low doping.  In the superconducting state the quantum zero-point energy, through its dependence on the condensate density,  accounts for the mysterious T-linear dependence of the observed specific heat, a result that modifies the standard T^3 law associated with Goldstone modes.


noviembre 22, 2018
2:30 pm - 4:00 pm


Miguel Angel Martin-Delgado


Seminario FTI
Avenida Complutense
Madrid, Madrid 28011 España
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