Our section supports core scientific and technological missions of the Laboratory, executing forefront research in condensed matter physics, science and technology. The research portfolio addresses needs in national security, high-energy-density science, equation-of-state and constitutive properties, basic science and advanced technology. Scientists in the section use modern experimental platforms, high-performance computing and advanced theoretical methods. A signature deliverable of the section is comprehensive predictive understandings of the physics of matter under a broad range of conditions using tightly coordinated theory, experiments and simulations. Scientists in the Condensed Matter section support national security science and technology missions and pursue forward-looking research studies to anticipate and address future challenges.
Associate Division Leader: William Evans
Group Leader: Jason Jeffries
The High Pressure Physics Group conducts static and dynamic experimental research addressing scientific challenges in condensed matter under extreme compression and thermal conditions. We conduct high fidelity studies of the physical, thermodynamic and constitutive properties of matter and the associated dynamics and kinetics of phase transitions. We use/develop state-of-the-art experimental facilities and associated technologies, including synchrotron x-ray scattering, laser spectroscopies, velocimeters, time-resolved detectors and a diverse set of high-pressure experimental platforms. Diamond-anvil cells are used to statically squeeze and heat matter to high-pressure and high temperature conditions, while gas-guns and high-energy lasers produce extreme on and off-Hugoniot states of dynamic compression in matter. These experimental investigations are closely coordinated with modern theoretical modeling to develop a fundamental predictive understanding of the physical phenomena governing the response of materials to extreme environments found in planetary, high energy density and advanced technological systems. The group's experimental studies are closely aligned and have vital and substantial impact on the NNSA's Stockpile Stewardship mission.
Group Leader: Philip Sterne
The EOS Capability Development and Application Group focuses on developing and implementing new tools for EOS and related applications. These span the range from quantum electronic structure code development to the libleos Application Program Interface and associated tools. The goal of the group is to emphasize the importance of longer-term capability development for EOS related activities.
Group Leader: John Klepeis
The Equation of State (EOS) and Materials Theory Group performs theoretical and computational condensed-matter physics research in support of major Department of Energy and LLNL programs. This research emphasizes quantum mechanical modeling and simulation of materials properties over wide ranges of temperature and pressure and can extend from bulk solids and liquids to dilute gases to high energy density plasmas. The major focus is on understanding and elaborating the structural and thermodynamic properties of materials. We study both equilibrium and non-equilibrium phenomena and are concerned with the development and application of accurate multiphase EOS and high pressure structural phase diagrams. We are also responsible for creating and maintaining EOS data libraries for a wide range of materials. Current forefront research includes the development of quantum simulation methods for high-Z metals and the study of f-electron materials with strong electron-electron correlation.
Group Leader: Johnathan DuBois
Group Leader: Vincenzo Lordi
The Quantum Simulations Group (QSG) specializes in combining state-of-the-art quantum simulation approaches with large-scale computing resources to validate, understand and predict the properties of materials that are relevant to the national security missions of LLNL. The combination of high performance computing with advanced quantum simulations enables the accurate prediction of a wide range of materials properties and opens up the possibility to discover new materials with specific targeted properties or to examine states of matter that are difficult to access experimentally. The current major research areas within the QSG include the development and use of quantum simulations to determine the equation of state of materials under extreme conditions, the discovery and optimization of materials for energy storage and conversion technologies, the construction of realistic materials models for applications such as radiation detection, quantum computing, and optical materials, and the continual development of advanced theoretical models for electronic structure. The Quantum Simulations Group is a joint Group with the Materials Science Division within PLS Directorate.