Many-body techniques are computational and theoretical methods used to describe and solve quantum or classical systems with a large number of interacting particles, where correlations invalidate simple mean-field or single-particle approximations. They encompass approaches such as Green’s function methods, diagrammatic perturbation theory, coupled-cluster theory, configuration interaction, quantum Monte Carlo, density-matrix renormalization group, and dynamical mean-field theory. These techniques systematically incorporate many-body correlations into observables like excitation spectra, ground-state energies, and response functions, and are central in condensed matter physics, nuclear structure, quantum chemistry, and strongly correlated materials research.
Birds in flocks, bacteria and cells: In many collective systems, individual elements respond to only part of their surroundings, seemingly defying Newton's third law of motion—action equals reaction. These exceptions are ...
General Physics
Jun 12, 2026
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Using a conventional computer and cutting-edge mathematical tools and code, physicists at the Center for Computational Quantum Physics (CCQ) at the Simons Foundation's Flatiron Institute and collaborators at Boston University ...
Quantum Physics
May 21, 2026
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The most demanding calculations in quantum chemistry can now be solved with graphics processing unit (GPU) supercomputers. A recently published study shows that software adapted to use GPU hardware can provide not just speed, ...
Quantum Physics
Apr 23, 2026
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For the last 80 years, the theory of quantum electrodynamics (QED), which describes all electromagnetic interactions, has been a cornerstone of the standard model, withstanding the scrutiny of countless experiments and agreeing ...
Optics & Photonics
Apr 14, 2026
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Over the past decades, energy engineers have developed increasingly advanced battery technologies that can store more energy, charge faster and maintain their performance for longer. In recent years, some researchers have ...
When most people hear "polymer," they think of plastics. In our group, polymerization is a way to line up identical molecules like beads on a string and let quantum mechanics take over. Put magnetic building blocks in a one-dimensional ...
A team of physicists from the University of Ottawa, led by Neda Boroumand, have developed a new theoretical model that shines new light on how scientists understand the way lasers interact with dense matter, such as solids ...
Condensed Matter
Feb 17, 2026
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71
From computers to smartphones, from smart appliances to the internet itself, the technology we use every day only exists thanks to decades of improvements in the semiconductor industry, that have allowed engineers to keep ...
Nanophysics
Jan 26, 2026
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Electrons can be elusive, but Cornell researchers using a new computational method can now account for where they go—or don't go—in certain layered materials.
Condensed Matter
Dec 8, 2025
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91
Imagine zooming into matter at the quantum scale, where tiny particles can interact in more than a trillion configurations at once.
Quantum Physics
Oct 8, 2025
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176
