Low temperature study of loss mechanisms of mechanical oscillators

Low-stress silicon carbonitride for the machining of high-frequency nanomechanical resonators

“…[15][16][17][18] Indeed, silicon structures described as having very high Q͑Ͼ100 000͒ have traditionally been macroscopic in nature, with operating frequencies in the 1 -100 KHz range, limiting their fQ product to the 10 9 -10 10 s −1 range. [15][16][17] On the other hand, silicon devices of dimensions similar to those presented here have been known to exhibit surface-mediated issues impairing their performance, limiting their fQ product to the mid-10 10 s −1 range, even following extensive surface conditioning. 18 We believe that introduction of marginal tensile stress improves confinement of energy in the device by mitigating mechanical coupling with the clamping points.…”

Investigation of phonon transport and thermal boundary conductance at the interface of functionalized SWCNT and poly (ether-ketone)

“…Allen [28,29] to calculate thermal conductivity was derived from the Green Kubo formula and based on harmonic approximation relation. Interestingly, the thermal conductivity of propagon 13 modes converged after a "plateau" region (5-30K), but that of diffuson modes kept increasing to about 100K.…”

Coarse-Grained Molecular Dynamics for Computer Modeling of Nanomechanical Systems

“…This effect has been observed in many experiments as well. [7,[54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72] Recently it was reported that 1 GHz NEMS flexural mode resonators have been successfully fabricated. [70] The 1 GHz resonators have a low quality factor, Q ∼ 500, although the cause for this has not yet been explained.…”