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europesays.com/us/57395/ Measurement of phonon angular momentum #Atomic #ClassicalAndContinuumPhysics #ComplexSystems #CondensedMatterPhysics #general #MathematicalAndComputationalPhysics #Molecular #OpticalAndPlasmaPhysics #Physics #Science #SensorsAndBiosensors #StructureOfSolidsAndLiquids #Theoretical #UnitedStates #UnitedStates #US

Measurement of phonon angular momentum
United States · Measurement of phonon angular momentum - United StatesIn condensed matter, angular momentum is intimately related to the emergence of topological quantum states, including chiral superconductivity, quantum spin liquids and various chiral quasiparticles. Recently, it has been predicted that microscopic lattice excitations, known as phonons, can carry finite angular momentum, leading to specific physical properties of materials. However, phonon angular momentum has not yet been observed directly. Here we demonstrate that angular momentum conservation results in a macroscopic mechanical torque when applying a time-reversal symmetry-breaking thermal gradient along the chiral axis of single-crystal tellurium. We probe this torque using a cantilever-based device and establish that it changes sign by flipping the chirality or thermal gradient. This behavior disappears in polycrystalline samples that lack a preferred chirality. Our experimental results align well with theoretical calculations. We provide compelling evidence for phonon angular momentum, which might enable quantum states with potential applications in microelectronics. Theory predicts that phonons—quanta of lattice vibrations—can carry finite angular momentum and thus influence physical properties of materials. Now phonons with angular momentum have been seen in tellurium with a chiral crystal structure.
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