Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 54: Posters: Quantum Optics and Photonics IV
Q 54.37: Poster
Thursday, March 12, 2020, 16:30–18:30, Empore Lichthof
Phasonic Spectroscopy of a Quantum Gas in a Quasicrystalline Lattice — Shankari V. Rajagopal1, Toshihiko Shimasaki1, Peter Dotti1, •Mantas Raciunas2, Ruwan Senaratne1, Egidijus Anisimovas2, André Eckardt3, and David M. Weld1 — 1Department of Physics, University of California, Santa Barbara, California 93106, USA — 2Institute of Theoretical Physics and Astronomy, Vilnius University, Sauletekio 3, LT-10257 Vilnius, Lithuania — 3Max-Planck-Institut fur Physik komplexer Systeme, Nothnitzer Str. 38, 01187 Dresden, Germany
Phasonic degrees of freedom are unique to quasiperiodic structures, and play a central role in poorly-understood properties of quasicrystals from excitation spectra to wavefunction statistics to electronic transport. However, phasons are challenging to access dynamically in the solid state due to their complex long-range character and the effects of disorder and strain. We report phasonic spectroscopy of a quantum gas in a one-dimensional quasicrystalline optical lattice. We observe that strong phasonic driving produces a nonperturbative high-harmonic plateau strikingly different from the effects of standard dipolar driving. Tuning the potential from crystalline to quasicrystalline, we identify spectroscopic signatures of quasiperiodicity and interactions and map the emergence of a multifractal energy spectrum, opening a path to direct imaging of the Hofstadter butterfly.