To get the latest news year round, please follow us on social media:

Join us this Wednesday, 2/21/2024 for our first career event of the spring semester! Pizza will be served.
Join us Thursday, 2/1 for a seminar with guest Dr. Emilie Huffman from the Perimeter Institute for Theoretical Physics. Her talk is titled "Principles for Modeling Physically-Relevant Quantum Systems of Many Particles with Computers".

Abstract: Systems of many strongly-interacting particles are key to explaining many phenomena: from the magnets in our everyday experience to more exotic phenomena such as superconductivity, quantum hall physics, and emergent gauge symmetries. However, the necessary quantum mechanical treatments of these systems involve Hilbert spaces that grow exponentially with the system volume, putting naive calculations out of reach. In this talk, I will motivate three useful principles for building models that are both relevant to nature and amenable to computer simulation in polynomial time: locality, symmetry, and small ultralocal Hilbert spaces. With classical computers we will see how locality as a guiding principle allows us to study antiferromagnetism and superconductivity with relativity, and how symmetry as a guiding principle allows us to detect conformal field theories using the quantum hall effect. Finally for quantum computers we make use of small ultralocal Hilbert spaces as a guiding principle, and then design and study resource-efficient qubit-friendly models that realize continuous gauge symmetries found in fundamental physics.

The talk will be held in Olin 101 at 4pm. Refreshments will be served in the Olin Lobby beginning at 3:30 pm. Hope to see you there!
This week's colloquium speaker, from the Physics department at Brown University, is Dr. Jiang-Xiazi Lin. Her talk is titled "Exploring Emergent Quantum Phases in Two-Dimensional Flat Band Systems"

Abstract: 
Quantum phases such as superconductivity and ferromagnetism are among the most important topics in 
condensed matter physics research. Recently, a family of two-dimensional flat band systems, including magic-angle twisted graphene, uncovered an abundance of symmetry breaking and novel quantum phases. 
In this talk, I will introduce the recent advances in these materials and give two examples of how we engineered and 
revealed new quantum phases of matter in twisted graphene. These include an orbital ferromagnetic state induced by 
spin-orbit coupling and a zero-field superconducting diode effect. In the last part of the talk, I will present our discovery of a new type of Coulomb-driven rotational symmetry breaking 
state in the moiré-less bilayer graphene. These examples establish the two-dimensional flat band systems as a versatile platform with multiple tuning knobs, where new physics emerges from the interplay between various quantum phases.

-

The presentation is at 4pm on Thursday, January 25th in Olin 101. Refreshments will be served beginning at 3:30pm in the Olin lobby.
Tomorrow we are excited to welcome our first Spring 2024 seminar speaker, Alejandro Cárdenas-Avendaño, from Princeton University. His presentation is titled "A Panoptic Study of Strong Gravitational Phenomena". The talk will begin at 4pm in Olin 101**.

Abstract: Recent novel data channels have been instrumental in exploring various predictions of Einstein's general relativity. From the direct detection of gravitational waves to imaging supermassive black holes, these groundbreaking observations have shed light on the behavior of spacetime under extreme conditions, confirmed core predictions of the theory, and opened up new frontiers that bridge fundamental physics and astrophysics. Our ability to learn about the underlying physics depends heavily on our understanding of the gravity theory that describes the geometry around these compact objects and for the electromagnetic observations, also on the complex astrophysics that produces the observed radiation. In this talk, I will discuss our upcoming capability to study general relativity in the strong gravity regime using (i) the electromagnetic radiation from a black hole's accretion disk and (ii) the gravitational radiation when a small compact object falls into a supermassive one. Emphasizing the significance of multi-messenger approaches across diverse astrophysical systems, I will highlight their pivotal role in unraveling new physics.

**Refreshments will be served in the Olin Lobby beginning at 3:30pm.
Congratulations to Katie Koch on winning 2nd place poster prize in the symposium “EL02- Emerging Ultrafast Optical and Structural Probes in Materials Science” at the Fall Materials Research Society conference! Katie is mentored by Professor Ajay Ram Srimath Kandada.

Her presentation was about photo-excitation dynamics in metal halide perovskite nanocrystals assemblies. These material systems are being explored in light-emitting technologies, and many-body interactions between photo-excitations are critical in driving the relevant optoelectronic processes. Katie’s work quantitatively details the mechanisms of such interactions through the use of advanced optical probes.