Abstract

At low frequencies, a phononic crystal behaves like homogeneous medium. Different variants of homogenization technique have been recently proposed to calculate the effective elastic parameters periodic Here, we develop theory for solid rods in viscous fluid. Using plane wave expansion method, derive analytical formula decay coefficient frequency sound propagating 2D Bravais lattice with arbitra...

By creating line defects in the structure of a phononic crystal PC made by etching a hexagonal array of holes in a 15 m thick slab of silicon, high-Q PC resonators are fabricated using a complimentary-metal-oxide-semiconductor-compatible process. The complete phononic band gap of the PC structure supports resonant modes with quality factors of more than 6000 at frequencies as high as 126 MHz. T...

There is a growing effort in creating chiral transport of sound waves. However, most approaches so far have been confined to the macroscopic scale. Here, we propose an approach suitable to the nanoscale that is based on pseudomagnetic fields. These pseudomagnetic fields for sound waves are the analogue of what electrons experience in strained graphene. In our proposal, they are created by simpl...

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In the low dimensional spin systems SrCu2(BO3)2 and CuGeO3 the thermal conductivities along different crystal directions show pronounced double-peak structures and strongly depend on magnetic fields. For SrCu2(BO3)2 the experimental data can be described by a purely phononic heat current and resonant scattering of phonons by magnetic excitations. A similar effect seems to be important in CuGeO3...