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Lehrstuhlseminar Experimentalphysik I


8.11.2017 15:45, Raum: R-344
Johannes Knörzer (Max Planck Institut für Quantenoptik - Abt. Cirac)
Acoustic Traps and Lattices for Electrons in Semiconductors

Optical lattices, periodic arrays of microscopic potentials induced via the AC Stark effect by interfering laser beams, have become a valuable tool to study a variety of many-body phenomena and, ultimately, are envisaged to allow access to the understanding of yet open questions such as the fundamental physics behind high-temperature superconductivity. In a different approach, one may study similar systems in a solid-state environment: In this talk, I will introduce a solid-state platform based on surface acoustic waves (SAWs) for trapping, cooling and controlling (quasi-)particles, as well as the simulation of quantum many-body systems. In a recent proposal, we have a developed a theoretical framework demonstrating the emergence of effective time-independent acoustic trapping potentials for particles in two- or one-dimensional structures, with lattice parameters that are reconfigurable in real-time. Potential experimental platforms for a faithful implementation of such an acoustic lattice will be discussed and estimates for typical system parameters will be given. With a projected lattice spacing on the scale of hundreds of nanometers, this approach allows for relatively large energy scales in the realization of the fermionic Hubbard model, with the ultimate goal to enter regimes where the antiferromagnetic spin-spin interaction strength exceeds cryostatic temperatures. To conclude, implementation and read-out schemes are discussed.

29.11.2017 15:45, Raum: R-344
Michael Kaniber (Walter Schottky Institut, TU München)
Two-dimensional crystals and their coupling to plasmonic nanostructures