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Chunhui Du, Assistant Professor of Physics at University of California, San Diego (UCSD)
Title: Harnessing Nitrogen Vacancy Centers in Diamond for Next-Generation Quantum Science and Technology
May 16, 2022 at 4:10 PM
Advanced quantum systems are integral to scientific research and modern technology enabling a wide range of emerging applications. Nitrogen vacancy (NV) centers, optically active atomic defects in diamond, are naturally relevant in this context due to their unprecedented spatial and field sensitivity, single-spin addressability, and remarkable functionality over a broad temperature range. Many of these advantages derive from the quantum-mechanical nature of NV centers that are endowed by excellent quantum coherence, controllable entanglement, and high fidelity of operations. In this talk, I will present our recent work on developing state-of-the-art NV-based quantum sensing and imaging techniques and demonstrate their direct applications to address the current challenges in both condensed matter physics and quantum sciences and technologies. Specifically, we have utilized NV centers to probe the exotic charge and spin properties of emergent quantum materials including high-Tc superconductors, magnetic topological materials, and antiferromagnetic insulators. We also integrate NV centers with functional magnetic devices to develop hybrid quantum systems, promoting the role of NV center at the forefront of quantum technologies. Lastly, I will briefly discuss our ongoing efforts to explore quantum sensing using emergent color centers beyond NV centers.
Hanna Terletska, Assistant Professor of Physics at Middle Tennessee State University
Title: Understanding electron localization in quantum materials using cluster embedding tools.
April 25, 2022 at 4:10 pm
Functional quantum materials, including Mott insulators and high-temperature superconductors, are at the forefront of condensed matter research. These materials are being actively explored for transformative technological applications, including efficient energy generation, storage, and transmission. Understanding the fundamental mechanisms behind the exotic phases of matter emerging in quantum materials is a grand challenge, which must be overcome to maximize technological advancement. Due to the complexity of the many-electron problem numerical treatment is often required. Over the past decades, numerical analysis has become a very powerful tool for studying strongly correlated electron systems, both clean and materials with defects.
Electron localization (driven by electron interactions or disorder) is a key feature of numerous quantum materials. Various exotic phases of matter with dramatic changes in electronic, magnetic, transport properties find their roots at electron localized states. Hence, its understanding is critical for further control and optimization of quantum materials and their applications. In this talk, I will first present our results on electron localization in the Hubbard model and beyond using the Dynamical Mean Field Theory and its cluster extension. I will demonstrate how the Mott metal-insulator transition can be described in the framework of the quantum critical phase transition. I will also share our recent results on treating electron localization in disordered electron systems using the typical medium quantum cluster approaches.
Acknowledgments: this work is supported by NSF CAREER grant # 1944974 and NSF OAC grant # 1931367.
Indara Suarez, Assistant Professor of Physics at Boston University
Title: The perfect storm of recent LHC results
January 31, 2022 at 4:10 PM

Questions surrounding the properties of the Higgs Boson as well as astrophysical evidence for dark matter suggest that new fundamental particles and interactions are awaiting discovery. Over the projected lifetime of the Large Hadron Collider (LHC) experiments, my group is utilizing the wealth of data collected by the Compact Muon Solenoid (CMS) to search for these particles by using top quarks and Higgs bosons as guiding lights. Through detector developments and machine learning techniques, we have begun to severely constrain prevailing notions of how natural solutions to Higgs mass hierarchy and dark matter can manifest themselves experimentally. I will show the latest results from the LHC and discuss possible future directions in our search for new physics phenomena.
Ana Asenjo Garcia Assistant Professor of Physics at Columbia University
Title: Quantum optics in atomic arrays
Apr 26th, 2021 at 4:10 PM

Tightly packed ordered arrays of atoms (or, more generally, quantum emitters) exhibit remarkable collective optical properties, as dissipation in the form of photon emission is correlated. In this talk, I will discuss the single-, few- and many-body out-of-equilibrium optical physics of atomic arrays, and their potential to realize versatile light-matter interfaces. In particular, I will focus on subradiance (where atoms are “dark” and become decoupled from the radiative environment) and on its counterpart, superradiance (where atoms are “bright” and radiate much faster than a single atom would). I will finish by discussing the implications of collective light matter interaction in quantum information processing, non-linear optics, and metrology.

Kerstin Perez, Assistant Professor of Physics at MIT
Title: Scanning the X-ray Sky for Dark Matter
May 3rd, 2021 at 4:10 PM

The nature of dark matter is a driving question of 21st century physics.  Dark matter particle interactions could imprint characteristic signals in cosmic-ray and multi-wavelength observations of the sky. The central challenge is to distinguish these signatures from similar spectra produced by standard astrophysical processes, such as the life and death of stars and the interactions of cosmic rays with interstellar material. I will review my group’s work using the NuSTAR X-ray satellite telescope to deliver new insights on both light dark matter and stellar backgrounds to these searches. 

Stephanie Wissel Assistant Professor of Physics at Penn State
Cosmic Neutrino Experiments at the Highest Energies
May 17th, 2021 at 4:10 PM

Cosmic neutrinos provide a unique window into the extreme environments of the most energetic sources in the universe and a test-bed for fundamental physics in largely unexplored energy regimes. However, these energetic neutrinos are rare and challenging to detect. Radio experiments can take advantage of the bright radio spark resulting from the highest energy neutrino interactions as well as the long propagation lengths of radio in air and ice to build the enormous detector volumes needed. In this talk, I will review current radio experiments and discuss future concepts aimed at understanding cosmic engines and exploring particle interactions at the highest energies.

Laura Lopez, Assistant Professor of Astronomy at Ohio State University.
The Importance and Challenges of Assessing Stellar Feedback (slides)
Nov 16th, 2020 at 4:10 PM

Massive stars have a profound astrophysical influence on the interstellar medium (ISM) throughout their tumultuous lives and deaths. Stellar feedback occurs through a variety of mechanisms: radiation, photoionization heating, winds, protostellar jets, supernovae, and cosmic-rays. Despite its importance, stellar feedback is cited as one of the biggest uncertainties in astrophysics today, stemming from a need for observational constraints and the challenges of considering many feedback modes simultaneously. In this talk, I will discuss recent studies of feedback from small scales of star clusters to large scales of galactic disks and outflows. By comparing multiwavelength observations with theoretical models, I will present constraints on the comparative role of different feedback modes and how they vary over time and conditions. Moreover, I will discuss the latest developments in understanding the importance of cosmic-ray feedback based on simulations and high-energy observations.

Monika Schleier-Smith, Associate Professor of Physics at Stanford University.
Choreographing Quantum Spin Dynamics with Light.
March 9th, 2020 at 4:10 PM

The power of quantum information lies in its capacity to be non-local, encoded in correlations among two, three, or many entangled particles. Yet our ability to produce, understand, and exploit such correlations is hampered by the fact that the interactions between particles and ordinarily local. I will report on experiments in which we use light to induce long-range interactions among cold atoms, with photons acting either as messengers or as a means of accessing highly polarizable Rydberg states. These optically controlled interactions open new opportunities in areas ranging from quantum technologies to fundamental physics. I will touch on prospects in quantum-enhanced sensing, combinatorial optimization, and simulating quantum gravity.