Andreas Hemmerich

TL;DR: In this paper, the authors describe a compact, economic and versatile diode laser system based on commercial laser diodes, optically stabilized by means of feedback from a diffraction grating, which offers singlemode operation with a linewidth of a few 100 kHz, continuous scans over 25 GHz, high chirp rates (up to 9 GHz/ms) and FM-modulation up to the GHz range.

TL;DR: In well-controlled sweeps across the Hepp–Lieb–Dicke phase transition, hysteretic dynamics showing power-law scaling with respect to the transition time suggests an interpretation in terms of a Kibble–Zurek mechanism, and indicates the possibility of universal behavior in the presence of dissipation.

TL;DR: In this article, an atomic superfluid is realized in such a higher energy band, which can provide insight into a wider range of many-body effects than the shape that bosonic ground-state wavefunctions can take.

TL;DR: In this paper, an optical lattice inside of a high-finesse optical cavity is merged such that an extended Hubbard model with cavity-mediated infinite range interactions arises, and two superradiant phases are found, one of them coherent and hence superfluid and one incoherent Mott insulating.

TL;DR: The vibrational levels of rubidium atoms are observed spatially confined in two dimensions by two crossed optical standing waves with mutually orthogonal linear polarization forming a two-dimensional collimated array of linear de Broglie waveguides.