Group Seminar at MPQ: Towards a more stable lattice with tunable geometry and tailored optical potentials with a spatial light modulator

Justus Brueggenjuergen from Markus Greiner’s group, Havard University

March 26, 2019

Quantum gas microscopy of fermionic atoms enables site-resolved studies
of strongly correlated quantum many-body states in the Fermi-Hubbard
Model. The addition of entropy redistribution via a digital micromirror
device (DMD) has allowed us to achieve sufficiently low temperatures for
long-range antiferromagnetic order. To reach even lower temperatures and
address long-standing open questions of the repulsive Fermi-Hubbard
model, new techniques for quantum state preparation are required. In
particular, we have created ultra-low entropy band insulators as a
starting point to adiabatically realize ultra-low entropy many-body
states. The preparation of those states requires precise control of the
lattice position in relation to the engineering potential. I will
present an automatic alignment procedure with galvanometer scanners. In
addition to investigate the quantum properties of atoms and molecules
with few fermions in a quantum gas microscope specifically-tailored
optical potentials are needed. I will demonstrate how these potentials
can be created with spatial light modulators.

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