Berlin 2012 – wissenschaftliches Programm

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AGPhil: Arbeitsgruppe Philosophie der Physik

AGPhil 3: Complex and Open Systems

AGPhil 3.3: Vortrag

Dienstag, 27. März 2012, 11:30–12:00, H 2033

What can we learn from a real-time analysis of nonequilibrium quantum many-body systems? — •Michael Moeckel — Max-Planck-Institute for Quantum Optics, Hans-Kopfermann-Str. 1, 85748 Garching

The interplay of nonequilibrium initial conditions and quantum many-body correlations currently receives new attention in condensed matter theory. Strong quantum many-body correlations can be imposed either by (many-) particle interactions or by the quantum statistics of the particles itself. Nonequilibrium conditions allow to initialize a quantum many-body system in an excited state. Then, its subsequent dynamics is determined by a unitary evolution in the Hilbert space.

In a large class of quantum dynamics experiments, e.g. in pump-probe laser spectroscopy of complex materials, the resulting trajectory in Hilbert space is assessed: From the temporal evolution of expectation values of particular observables researchers conclude on the properties of the (static) complex quantum system. The reasoning behind this approach is commonly based on an analogous understanding of energy-time uncertainty as it is motivated by Fermi’s Golden Rule: Large energy transitions occur already at short times, while small energy details become observable only on large time scales of the dynamics.

In my presentation I will briefly review current experimental and theoretical work, analyze necessary prerequisites for gaining substantial information from such setups and address the question to which extent intrinsic quantum correlations can be made visible by "mapping them into the time domain".