Welcome to the Greiner Lab!

We use ultracold quantum gases on optical lattices to simulate models from condensed matter physics. Thanks to the microscopy technique developed here, we can see and manipulate individual atoms to perform experiments with remarkable levels of control and accuracy.

For the nonexperts, the 10-minute documentary introducing the background, motivation, and apparatus of our lab is a great starting point. To learn about the sciences, follow the links on the rightfollow the links in the navigation bar to each individual lab.


Recent Publications

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Observation of Nagaoka Polarons in a Fermi-Hubbard Quantum Simulator
08/2023
arXiv:2308.12269
M. Lebrat*, M. Xu*, L. Kendrick, A. Kale, Y. Gang, Pranav Seetharaman, Ivan Morera, Ehsan Khatami, Eugene Demler, M. Greiner
Quantum interference can deeply alter the nature of many-body phases of matter. In the paradigmatic case of the Hubbard model, Nagaoka famously proved that introducing a single itinerant charge can transform a paramagnetic insulator into a ferromagnet through path interference. However, a microscopic observation of such kinetic magnetism induced by individually imaged dopants has been so far elusive. Here we demonstrate the emergence of Nagaoka polarons in a Hubbard system realized with strongly interacting fermions in a triangular optical lattice. Using quantum gas microscopy, we reveal these polarons as extended ferromagnetic bubbles around particle dopants arising from the local interplay of coherent dopant motion and spin exchange. In contrast, kinetic frustration due to the triangular geometry promotes antiferromagnetic polarons around hole dopants, as proposed by Haerter and Shastry. Our work augurs the exploration of exotic quantum phases driven by charge motion in strongly correlated systems and over sizes that are challenging for numerical simulation.

News

Aaron joins Greiner lab
01/2024
Postdoc Aaron Young has joined the Lithium lab. Welcome, Aaron!
Lin wins poster prize at ICOLS 2023!
07/2023
Lin Su wins the Atom Computing Poster Prize at the International Conference on Laser Spectroscopy, for his poster Dipolar Quantum Solids in a Quantum Gas Microscope. Congratulations, Lin!
Sirina and Vikram join Greiner lab
07/2023
Undergraduates Sirina Prasad and Vikram Singh have joined the Lithium and Erbium labs, respectively. Welcome, Sirina and Vikram!
Sooshin Defends
04/2023
Congratulations to Sooshin for successfully defending his thesis!