Quantum many-body systems are physical systems composed of a large number of interacting quantum particles (such as electrons, atoms, or spins) whose collective behavior cannot be reduced to a simple sum of single-particle properties. They are described by many-body Hamiltonians on high-dimensional Hilbert spaces, where quantum statistics, entanglement, and correlations play central roles. Such systems exhibit emergent phenomena including quantum phase transitions, superconductivity, magnetism, and topological order, and are studied using methods like second quantization, Green’s functions, tensor networks, and quantum Monte Carlo to understand their equilibrium and nonequilibrium properties across different interaction and dimensionality regimes.
What happens when a quantum physicist is frustrated by the limitations of quantum mechanics when trying to study densely packed atoms? At EPFL, you get a metamaterial, an engineered material that exhibits exotic properties.
Condensed Matter
Mar 25, 2025
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In a new publication in Nature Materials, an international team of researchers has developed groundbreaking artificial chains of the iconic "olympicene" molecules to realize the antiferromagnetic (AF) spin-½ Heisenberg model, ...
Condensed Matter
Mar 14, 2025
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Using the Multi-frequency High Field Electron Spin Resonance Spectrometer at the Steady-State High Magnetic Field Facility (SHMFF), researchers observed the first-ever Bose–Einstein condensation (BEC) of a two-magnon bound ...
Condensed Matter
Mar 13, 2025
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Simulations of quantum many-body systems are an important goal for nuclear and high-energy physics. Many-body problems involve systems that consist of many microscopic particles interacting at the level of quantum mechanics. ...
Quantum Physics
Mar 12, 2025
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Many physicists and engineers have recently been trying to demonstrate the potential of quantum computers for tackling some problems that are particularly demanding and are difficult to solve for classical computers. A task ...
Attosecond time-resolved experiments have revealed the increasing importance of electronic correlations in the collective plasmon response as the size of the system decreases to sub-nm scales.
Nanophysics
Feb 13, 2025
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How does cold milk disperse when it is dripped into hot coffee? Even the fastest supercomputers are unable to perform the necessary calculations with high precision because the underlying quantum physical processes are extremely ...
Quantum Physics
Feb 6, 2025
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Quantum entanglement—a phenomenon where particles are mysteriously linked no matter how far apart they are—presents a long-standing challenge in the physical world, particularly in understanding its behavior within complex ...
Quantum Physics
Jan 23, 2025
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A research team discovered a quantum state in which electrons move in a completely new way under a twisted graphene structure. The unique electronic state is expected to contribute to the development of more efficient and ...
Quantum Physics
Jan 21, 2025
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At extremely high densities, quarks are expected to form pairs, as electrons do in a superconductor. This high-density quark behavior is called color superconductivity. The strength of pairing inside a color superconductor ...
General Physics
Jan 14, 2025
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