The particle charge of a fermion is equivalent to its topological charge, which underpins the stability of the Fermi surface, the applicability of Landau Fermi liquid theory, and the Luttinger theorem in insulators.
Non-reciprocal elastic wave propagation in spatiotemporal periodic structures
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A review unifying theory and experiments on topological phonons across crystalline solids, acoustic metamaterials, and non-Hermitian platforms.
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Topological phononics
A review unifying theory and experiments on topological phonons across crystalline solids, acoustic metamaterials, and non-Hermitian platforms.