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Events at Physics

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Events During the Week of February 12th through February 19th, 2023

Sunday, February 12th, 2023

Wonders of Physics
The Wonders of Physics 40th annual show
Time: 1:00 pm
Place: 2103 Chamberlin
Abstract: The Wonders of Physics annual show is a fast-paced, engaging, and educational physics program, filled with demonstrations that help people better understand the physics in the world around them, while having fun at the same time.
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Wonders of Physics
The Wonders of Physics 40th annual show
Time: 4:00 pm
Place: 2103 Chamberlin
Abstract: The Wonders of Physics annual show is a fast-paced, engaging, and educational physics program, filled with demonstrations that help people better understand the physics in the world around them, while having fun at the same time.
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Monday, February 13th, 2023

Atomic Physics Seminar
The geometry of quantum error correction under biased noise
Time: 11:00 am
Place: 5310 Chamberlin Hall
Speaker: Arpit Dua
Abstract: Quantum error correction is necessary because physical qubits have much higher error rates per gate operation than are needed for practical tasks. The popular choice is to encode a logical qubit in a large enough planar layout of many physical qubits, called the surface code, to have sufficiently low logical error rates. The optimal logical error rates depend on the statistical mechanics of logical operators. For example, under biased Pauli noise, having more higher-weight logical operator representations with a higher ratio of low-rate Pauli operators is better. Using this idea, I will discuss how, in active error correction, measuring Clifford-rotated Pauli stabilizers of the surface code can enhance code performance: higher error thresholds and lower subthreshold logical error rates, for biased Pauli noise. Using statistical mechanics and percolation theory, I will describe a phase diagram of 50% thresholds for random Clifford-rotated surface codes under pure dephasing noise. Using tensor network numerics, I will show that certain families of these random codes outperform the best-known translation invariant Clifford-rotated surface codes for finitely biased depolarizing noise.
Host: Thad Walker
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Tuesday, February 14th, 2023

R. G. Herb Condensed Matter Seminar
Discovering and Engineering Two-Dimensional Magnetism and Superconductivity
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Tiancheng Song, Princeton
Abstract: Understanding and manipulating macroscopic quantum phenomena such as superconductivity and magnetism are crucial for future quantum science and technology. Two-dimensional (2D) materials and their van der Waals (vdW) heterostructures offer a promising platform to achieve this goal due to their exceptionally broad tunability. In this talk, I will highlight the potential of such a platform through two outstanding examples: 2D magnetism and 2D superconductivity. In the first part, I will talk about a series of emergent phenomena enabled by the vdW nature of 2D magnets, including (1) giant tunneling magnetoresistance enhanced by spin-filtering effects; (2) control of interlayer magnetism by tuning layer stacking; (3) novel moiré magnetism by twisting two layers of 2D magnets. In the second part, I will introduce a new probe to detect superconducting fluctuations down to millikelvin temperatures based on thermoelectric measurements of a monolayer nanoflake. I will discuss surprisingly unusual vortex Nernst signals, which reveal an unconventional superconducting quantum criticality in an electrically tunable 2D superconductor. Finally, I will conclude by highlighting unique opportunities for discovering and engineering new quantum materials and electronic phases in two dimensions.
Host: Victor Brar
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Council Meeting
Time: 3:00 pm
Place: 2314 Chamberlin Hall
Speaker: Mark Eriksson, UW-Madison
Host: Mark Eriksson
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Wednesday, February 15th, 2023

Department Meeting
Time: 12:15 pm
Place: B343 Sterling Hall
Speaker: Mark Eriksson, UW-Madison
Host: Mark Eriksson
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Theory Seminar (High Energy/Cosmology)
Title to be announced
Time: 1:00 pm
Place: Chamberlin 5280
Host: George Wojcik
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Thursday, February 16th, 2023

R. G. Herb Condensed Matter Seminar
Strange Metal Behavior in the Hall Coefficient of BaFe2(As,P)2
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Ian Hayes, University of Maryland
Abstract: Even after decades of research on the high-Tc cuprates, several parts of their phase diagrams remain mysterious, especially the normal state above Tc near optimal doping, a region commonly referred to as the strange metal phase. New avenues for studying this physics were opened up by the discovery of the iron-based high-Tc materials, which also exhibit strange metal characteristics, particularly a T-linear resistivity and a roughly 1/T Hall coefficient near optimal doping. In this talk I will present measurements of the Hall coefficient in phosphorous-doped BaFe2As2 in fields of up to 65 tesla, which is enough to suppress superconductivity even at optimal doping. These measurements reveal a striking parallel between the effects of increasing magnetic field and the effects of increasing temperature, a phenomenon that is reminiscent of the field-temperature scaling seen in the resistivity of this compound. This characteristic field dependence allows us to clearly identify the extent of strange metal physics in the entire phosphorous-doping phase diagram. Intriguingly, the presence of strange metal behavior in the Hall coefficient is directly related to the presence of the superconductivity across the phase diagram. I will discuss the implications of these observations for different approaches to the strange metal as well as the opportunities they present for future research.
Host: Victor Brar
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NPAC (Nuclear/Particle/Astro/Cosmo) Forum
Particle acceleration in astrophysical, magnetized turbulent plasmas
Time: 2:30 pm
Place: CH4274
Speaker: Martin Lemoine , Institut d’Astrophysique de Paris, CNRS
Abstract: How magnetized turbulent plasmas can accelerate charged particles to high energies represents a long-standing question with far-reaching implications for high-energy and multi-messenger astrophysics. It indeed goes back to the seminal works of Enrico Fermi (1949, 1954) and nowadays, it is commonly invoked to model the generation of non-thermal particle spectra in a broad variety of astrophysical sites, including extreme, relativistic sources. In particular, it has recently been considered as a possible origin for the high-energy neutrinos seen by Ice Cube in the direction of nearby active galactic nuclei. Our understanding of particle acceleration in turbulent plasmas has known substantial progress in recent years, mostly spurred by large-scale, kinetic numerical simulations. This talk will address those developments and discuss a theoretical picture to describe the physics at play, based on non-resonant interactions between particles and velocity structures. This model, which can be seen as a modern implementation of the original Fermi scenario, appears supported by recent numerical simulations of turbulence in the semi- and fully-relativistic regime. It also brings to light an interesting connection between the properties of intermittency of the turbulence and the spectrum of accelerated particles. I will discuss those features then conclude with some possible applications and extensions.
Host: Ellen Zweibel
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Friday, February 17th, 2023

Academic Calendar
Deadline for students (except Graduate) to change variable credits
Abstract: *Note: actual end time may vary.* CONTACT: 262-3811, registrar@em.wisc.edu URL:
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Academic Calendar
Deadline for students (except Graduate) to request pass/fail or credit/audit options for a Spring term course
Abstract: *Note: actual end time may vary.* CONTACT: 262-3811, registrar@em.wisc.edu URL:
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Academic Calendar
Deadline for students to drop a Spring term course and receive 50% tuition adjustment
Abstract: *Note: actual end time may vary.* CONTACT: 262-3811, registrar@em.wisc.edu URL:
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Physics Department Colloquium
“So a quantum computer walks into the White House…”
Time: 3:25 pm
Place: 2241 Chamberlin Hall
Speaker: Charles Tahan , Laboratory for Physical Sciences
Abstract: Charle Tahan is Director of the National Quantum Coordination Office (NQCO) within the
White House Office of Science and Technology Policy. Tahan is also
Chief Scientist of the National Security Agency's Laboratory for Physical Sciences.
He got his PhD degree under the supervision of Bob Joynt at UW-Madison.
Host: Robert Joynt
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Saturday, February 18th, 2023

Wonders of Physics
The Wonders of Physics 40th annual show
Time: 1:00 pm
Place: 2103 Chamberlin
Abstract: The Wonders of Physics annual show is a fast-paced, engaging, and educational physics program, filled with demonstrations that help people better understand the physics in the world around them, while having fun at the same time.
Add this event to your calendar
Wonders of Physics
The Wonders of Physics 40th annual show
Time: 4:00 pm
Place: 2103 Chamberlin
Abstract: The Wonders of Physics annual show is a fast-paced, engaging, and educational physics program, filled with demonstrations that help people better understand the physics in the world around them, while having fun at the same time.
Add this event to your calendar

Sunday, February 19th, 2023

Wonders of Physics
The Wonders of Physics 40th annual show
Time: 1:00 pm
Place: 2103 Chamberlin
Abstract: The Wonders of Physics annual show is a fast-paced, engaging, and educational physics program, filled with demonstrations that help people better understand the physics in the world around them, while having fun at the same time.
Add this event to your calendar
Wonders of Physics
The Wonders of Physics 40th annual show
Time: 4:00 pm
Place: 2103 Chamberlin
Abstract: The Wonders of Physics annual show is a fast-paced, engaging, and educational physics program, filled with demonstrations that help people better understand the physics in the world around them, while having fun at the same time.
Add this event to your calendar