Our group has pioneered the creation and study of Bose and Fermi-degenerate gases of dysprosium, the most magnetic element. In our experiments, we exploit the long-range and anisotropic character of the dipole-dipole interaction among Dy atoms to create novel testbeds for quantum many-body physics, both within and away from equilibrium. For example, we recently made a quantum and magnetic version of the famous Newton's cradle toy. We used it to explore the breakdown of quantum integrability and the onset of thermalization in a strongly interacting quantum 1D system. We've also used a new topological pumping scheme---that works like an Archimedes screw---to drive the 1D gas to highly excited "quantum many-body scar" states. We will now aim to explore these prethermal states and others using the coupling of the gas to photons in our new confocal cavity QED system.
W. Kao, K.-Y. Li, K.-Y. Lin, S. Gopalakrishnan, and B. L. Lev
Topological pumping of a 1D dipolar gas into strongly correlated prethermal states
Science 371, 296 (2021). pdf & SM
Stanford News: Stanford physicists find new state of matter in a one-dimensional quantum gas pdf
APS DAMOP Highlight: The Turn of the Screw
Y. Tang, W. Kao, K.-Y. Li, S. Seo, K. Mallayya, M. Rigol, S. Gopalakrishnan, and B. L. Lev
Thermalization near integrability in a dipolar quantum Newton's cradle
Physical Review X 8, 021030 (2018).
See Editors' Choice Watching magnetic atoms thermalize in Science
See News: Quantum Physics A tiny version of this physics toy is revealing quantum secrets in ScienceNews
See Synopsis Pathway to Quantum Thermalization in APS Physics
See Research Highlight Towards thermalization in Nature Physics
See Article Toy inspires experiment on behavior of quantum systems in Stanford News
Y. Tang, N. Burdick, K. Baumann, and B. L. Lev
Bose-Einstein condensation of 162Dy and 160Dy
New Journal of Physics 17, 045006 (2015). pdf
Special Issue: Focus on New Frontiers of Cold Molecules Research
K. Baumann, N. Q. Burdick, M. Lu, and B. L. Lev
Observation of low-field Fano-Feshbach resonances in ultracold gases of dysprosium
Physical Review A, Rapid Communications, 89, 020701(R) (2014). pdf
X. Cui, B. Lian, T.-L. Ho, B. L. Lev, and H. Zhai
Synthetic gauge field with highly magnetic lanthanide atoms
Physical Review A, Rapid Communications 88, 011601(R) (2013).
M. Hafezi, Z. Kim, S. Rolston, L. Orozco, B. L. Lev, and J. Taylor
An atomic interface between microwave and optical photons
Physical Review A, Rapid communications 85, 020302(R) (2012). pdf
M. Lu, S.-H. Youn, and B. L. Lev
Trapping ultracold dysprosium: A highly magnetic gas for dipolar physics
Physical Review Letters 104, 063001 (2010). pdf
Nature Research Highlights article “Dazzling dysprosium,” February 25th, 2010.
PhysicsWorld.com news report “Ultracold magnetic atoms bode well for quantum studies,” February 18th, 2010.
S. Kobtsev, B. Lev, J. Fortagh, and V. Baraulia
Powerful narrow-line source of blue light for laser cooling Yb/Er and Dysprosium atoms
Proc. of SPIE 7578, 75782F-1 (2010). pdf