Archiv 2016

Raum: Seminar Room IV, O1.111 Gastgeber: Martin Eckstein

Dynamics of the Transverse Field Ising Chain after a Sudden Quench

MPSD Seminar
Due to experimental advances in the preparation and control of ultra-cold atomic gases, there is a widespread interest in the behaviour of quantum systems out of equilibrium. A common way to probe quantum systems for non-equilibrium phenomena is given by sudden quenches. [mehr]

Transient Dynamics of d-Wave Superconductors after a Sudden Excitation

MPSD Seminar
In this talk I will discuss the transient dynamics of a d-wave BCS model after a quantum quench of the interaction parameter. The motivation comes from recent ultrafast pump-probe experiments on high-temperature superconductors. [mehr]

Disclosing fluctuations of lattice atomic positions in non-equilibrium optical experiments

MPSD Seminar
Fluctuations of the atomic positions are at the core of a large class of unusual material properties ranging from quantum para-electricity and charge density wave to, possibly, high temperature superconductivity. Their measurement in solids is the subject of an intense scientific debate focused on the research of a methodology capable of establishing a direct link between the variance of the ionic displacements and experimentally measurable observables. In this presentation I will introduce our new approach to address quantum and thermal fluctuation in complex materials. By means of non-equilibrium optical experiments performed in shot-noise limited regime we could reveal that the variance of the time dependent atomic positions and momenta is directly mapped into the quantum fluctuations of the photon number of the scattered probing light. A fully quantum description of the non-linear interactions between photonic and phononic fields pave the way for a direct measurement of fluctuation in complex systems. [mehr]

Dynamical Cooper pairing in non-equilibrium electron-phonon systems

MPSD Seminar
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