The discovery of magic angle twisted bilayer graphene (MATBG), where two sheets of monolayer graphene are precisely stacked at a specific angle, has opened a plethora of grand new opportunities in the field of topology, superconductivity, and other strongly correlated effect. In twisted van der Waals materials, lattice mismatch can generate…

I will discuss log corrections to the gravitational path integral around asymptotically Euclidean AdS4 backgrounds that arise from the compactification of string/M-theory. The heat kernel method will be utilized, which divides the log correction into local and non-local contributions. The local contribution is…

The recent detection of the coherent elastic neutrino-nucleus scattering (CEνNS) opens the possibility to detect neutrinos with small-size detectors and with different techniques, opening a new window to explore possible BSM physics.

The CEνNS process generates signals at the few-keV level, requiring sensitive detection…

The particle nature of dark matter and its role in galactic structure formation, especially at the small scales, are among the greatest outstanding questions in Lambda-CDM cosmology. Notable challenges include the core-cusp problem in dwarf galaxies and the potential discrepancies in the high-redshift galaxy abundance observed by the James Webb…

Topological defects in thermodynamic phases are characterized by winding

numbers of order parameters. Similarly, topological phases in the tenfold

classification of insulators and superconductors are characterized by Chern and

winding numbers. We show that both situations can be described by a single

formalism, using…

Escape the reading week hustle and holiday season stress by joining us for Tranquil Tuesday!

**Date: Dec. 12th**

**Time: 12pm**

**Location: Joseph Henry Room, 1st floor**

This exclusive event is designed for ** ALL** members of the physics…

The non-Hermitian skin effect (NHSE) is a phenomenon that occurs in non-Hermitian lattice systems, in which eigenstates are massively squeezed to the boundary. In our recent works, we propose a universal solution to the NHSE under open boundary condition in any spatial dimensions (arXiv: 2212.11743), borrowing the concept of amoeba from…

In 1974 Purcell authored a paper “Life at Low Reynolds Number” to describe the counterintuitive world of microscopic organisms in which viscous dissipation so dominates inertia that “coasting” is impossible, and that the geometry of a path in an internal movement space dominates self-propulsion. It is typically assumed that a key difference…

This talk will explore recent insights into the structure of classical self dual gravity and non-Kerr-Newman black holes from the study of celestial holography and scattering amplitudes. “Self dual gravity” refers to a theory in which the Riemann curvature 2-form is required to be invariant under the Hodge star operator. Such spacetimes are…

Post-inflationary QCD axion is an attractive solution to the Strong CP problem because of the possibility to uniquely predict the axion mass if axion makes up all of dark matter. On the other hand, QCD axion models often suffer from the so-called axion quality problem, where the axion shift symmetry is…

The cosmic microwave background (CMB) is a powerful probe into the history of our universe. The Simons Observatory (SO) is a currently-deploying CMB survey located in the Atacama Desert in Chile at an elevation of 5200 meters, consisting of an array of three 0.42-meter small aperture telescopes (SATs) and one 6-meter…

Decades of direct, indirect and collider searches of dark matter have set stringent constraints pushing us to entertain the possibility that dark matter interacts with us purely gravitationally. In this nightmare scenario, the underlying particle physics of dark matter as well as our cosmological history could still be discerned purely…

String stars, or Horowitz-Polchinski solutions, are string theory saddles with normalizable condensates of thermal-winding strings. In the past, string stars were offered as a possible description of stringy (Euclidean) black holes in asymptotically flat spacetime, close to the Hagedorn temperature. I will discuss the…

Strong interactions between electrons in solids lead to emergent quantum phenomena that can unveil important principles of physics. Recently, the observation of superconducting and correlated insulator states in magic-angle twisted bilayer graphene has promoted two-dimensional van der Waals heterostructures as a novel platform for studying…

In astrophysical fluid dynamics, stars are considered as isolated fluid masses subject to self-gravity. A classical model of a self-gravitating Newtonian star is given by the gravitational Euler- Poisson system, while a relativistic star is modeled by the Einstein-Euler system. In the talk, I will review some recent progress on the local and…

Two-dimensional materials, analogous to Lego on the atomic scale, offer unprecedented opportunities for designing exotic quantum phases through gating, stacking, and angle twisting. The unrivaled tunability gives rise to the flat electronic bands of moiré and crystalline graphene, promoting various correlated states including unconventional…

The Fractional Quantum Hall effect is one of the most fundamental phenomena of quantum physics. Under a very large magnetic field, and at fractional filling of a Landau level, when electrons are “supposed” (by simple band theory) to form a metal, one finds a gapped insulating state that is “topologically ordered” and hosts a huge array of…

Ultracold polar molecules provide a unique platform for simulating quantum many-body systems with long-range interactions. However, their complex internal structures and susceptibility to collisional losses present a significant challenge in both cooling them to quantum degeneracy and controlling their interactions. In this talk, I will present…

The discovery of the Higgs boson by the CMS and ATLAS experiments at the Large Hadron

Collider (LHC) was a monumental achievement, as it confirmed one of the core predictions of the

Standard Model (SM) of particle physics. However, there are still many discrepancies within the

SM, motivating the need for new physics beyond…

The discovery of the neutrino stands as pivotal milestone in the annals of modern physics. Following the initial detection of neutrinos, a diverse array of experiments employing both natural and artificial sources of neutrinos have played a crucial role in shedding light on the elusive nature of these particles, including their intriguing…

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