Research news on Symmetries in condensed matter

In condensed matter physics, analysis of symmetries is a fundamental theoretical technique used to classify phases of matter, constrain effective Hamiltonians, and predict emergent phenomena independent of microscopic details. By identifying spatial (lattice, point-group, translational), internal (spin, gauge), and spacetime (time-reversal) symmetries and how they are represented on fields or quasiparticles, one can determine allowed terms in Ginzburg–Landau functionals, low-energy effective field theories, and band structures. Symmetry considerations underlie methods such as group-theoretical classification of order parameters, symmetry-based selection rules, topological band theory, and the systematic construction of symmetry-protected and symmetry-enriched phases in crystalline and strongly correlated systems.

Atoms vibrate on circular paths—with an unexpected twist

An international team of researchers, including scientists from HZDR and Fritz Haber Institute of the Max Planck Society, for the first time directly observed how angular momentum is transferred and conserved within a crystal ...

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