Past Events

In quantum materials, function follows form: the collective behavior of a large ensemble of electrons crucially depends on the structure of the ionic crystal they inhabit. Ultracold fermionic atoms in optical lattices are a unique platform to understand such emergent phenomena by providing a very clean realization of the Hubbard model, one of the most fundamental models describing strongly correlated quantum matter. Yet, realizing and probing structures inspired by solid-state materials is a challenge beyond simple square geometries.

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Abstract: Particle, nuclear, and astrophysics experiments are producing massive amounts of data to answer fundamental questions about the basic constituents of our universe.  While researchers in these areas have been using advanced data science tools for decades, modern machine learning has introduced a paradigm shift whereby data can be directly analyzed holistically without first compressing it into a more manageable and human understandable format.  How will the machines help us explore the unknown?  Can they be trusted to give us the right answers?

Abstract: Ultracold dipolar gases, formed by atoms or molecules with strong dipole-dipole interactions, present radically different physics compared to their non-dipolar counterparts. In this talk, I will focus on dipolar gases in optical lattices or tweezer arrays. I will first discuss the case of spin models realized by pinned dipoles in optical lattices, commenting on the intriguing relaxation dynamics of spin patterns in bilayer and ladder set ups, and then briefly browsing over some interesting disorder scenarios in dipolar spin models.

Reception to follow talk in the h-Bar.

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JILA Memorial page for Pete Bender

ZOOM Information: 

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https://cuboulder.zoom.us/j/96293673597

Meeting ID: 962 9367 3597

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The interplay of topological order and strong interactions gives rise to exciting many-body physics such as the fractional quantum Hall effect, whose microscopic properties can be unveiled using neutral atom-based quantum simulators. However, the experimental challenges due to the need to engineer an artificial magnetic field, especially in presence of interactions, have so far limited possible studies to small systems with few particles.

Streaming in the JILA Auditorium from 2024 DAMOP Session Y02 Hot Topics

Abstract: We observed a narrow (~100 kHz) 229Th nuclear clock transition in Th-doped CaF2 crystals using a VUV frequency comb. The VUV comb directly links the 229Th nuclear transition frequency to the JILA Sr optical clock, enabling determination of the absolute 229Th clock frequency. These results represent a milestone in building solid-state nuclear clocks for precision measurements and fundamental physics.

Chuankun Zhang is giving a talk tomorrow at DAMOP in the “Hot Topics” session and we are going to stream it here at JILA!

Abstract: Physics education research in undergraduate laboratory courses is vital to ensure that these courses achieve their learning goals, such as developing hands-on technical skills and mastering concepts and practices related to measurement uncertainty. In this talk, I cover my role in developing a research-based assessment instrument, the Survey of Physics Reasoning on Uncertainty Concepts in Experiments (SPRUCE).

Abstract: Trapped ion systems are a leading platform for quantum information processing, but they are currently limited to 1D and 2D arrays, which imposes restrictions on both their scalability and their range of applications.

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We present the development and uncertainty evaluation of a transportable ytterbium optical lattice clock, achieving a total systematic uncertainty level of 3.7 ×10^-18. We also report a field test of the clock after transporting it to Washington DC, demonstrating the clock’s reliability and readiness to contribute to scientific efforts such as the redefinition of the SI second and frequency-based measurements of Earth’s geopotential.

Join one of CU Boulder’s beloved Nobel Laureate Professors, Eric Cornell on a journey through space, all in good time!  “Speed!”