Abstract: Quantum error correcting codes are an important part of quantum computing, enabling arbitrarily accurate computations despite faulty individual components. They…

Speaker: Ben Foutty, Stanford University

“Mapping topology and magnetic phase transitions in semiconductor moiré homobilayers”

Abstract

Semiconductor moiré superlattices host a wide array of correlated ground states arising from the interplay of strong electronic interactions and topological bands. In…

The two sexes of a species can display marked differences in essential behaviors such as feeding or escape from dangers, but the mechanisms underlying such behavioral dimorphism are poorly understood. In our work, we trace the molecular and cellular events that generate sexually dimorphic circuits at the single synapse and gene level. For…

Topology and quantum optics are two fields whose interplay can give rise to new physics [1]. By properly designing a photonic lattice (i.e., the structured reservoir), it is possible to engineer photon-mediated spin Hamiltonians between quantum emitters coupled to it. In particular, it is possible to endow photonic structures with Hermitian or…

Recently, a class of many-body Hamiltonians have been found to show exact periodic dynamics in the continuum of the energy spectrum where thermalization and chaos is expected. This phenomenon is known as the (exact) quantum many-body scar (QMBS) dynamics. We show that a wide range of QMBS models, plus many new ones, can be unified and…

Abstract: Two necessary ingredients of any quantum description of a black hole are strong coupling and a large number of degrees of freedom. Solving such quantum systems is therefore challenging, both analytically and numerically. We will discuss an alternative “matrix bootstrap” method that overcomes some of these challenges. After…

Nanoscale electrodynamics offers a unique perspective for unraveling the complex physics underlying these phenomena. This talk is focused on our studies on the intricate relationships among topology, geometry, and electron correlations in systems with flat bands. I will first discuss the exploration of a 3D quasi-crystalline system,…

Characterization and quantum control of complex quantum matter is one of the shared goals for condensed matter and quantum information science research. Toward this end, my research uses van der Waals materials to synthesize topological and correlated states, and quantum sensors based on spin defects to uncover their microscopic picture…

Understanding strongly correlated topological quantum phases has been a longstanding challenge. Moiré materials present a unique opportunity as they allow us to engineer flat topological bands and vary the carrier density throughout entire bands in situ using electrostatic gates. I will open the talk by presenting nanoscale images of…

Abstract:

Gravitational-wave astrophysics is now a reality. Since their first detection in 2015, gravitational waves from about 90 black hole and neutron star collisions have been observed, with hundreds more anticipated in the ongoing LIGO-Virgo-KAGRA observing run extending through 2024. Accordingly, gravitational-wave…

The growing catalog of gravitational-wave signals from compact-object mergers has allowed us to study the properties of black hole and neutron star binaries with increasing precision. However, the processes governing the formation and evolution of these systems and their electromagnetic counterparts remain largely unconstrained. The current…

Understanding the macroscopic statistical properties of a physical system can provide vital clues to its microscopic characteristics.  I will show that Einstein gravity at long distances contains statistical information about quantum spacetime.  For example, certain wormhole spacetimes encode statistics of quantum black hole…

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…

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…

Condensed matter physicists understand the universe by tracking collective motions of elementary particles, or quasiparticles, many of which parallel elementary particles in the Standard Model. However, the principle of fractionalization uncovers quasiparticles with no Standard Model counterpart. A seminal example is the fractional quantum Hall…

Abstract: Organic semiconductors are appealing for optoelectronic devices like solar cells and lighting and displays due to their low fabrication cost and energy input, tunable band gaps, and mechanical characteristics like their light weight and flexibility. However, these materials made of light atoms have low dielectric…