upward

Lattice dynamics

N K Voulgarakis, G Hadjisavvas, P C Kelires, G P Tsironis, Computational investigation of intrinsic localization in crystalline Si, PRB 69, 113201 (2004)

Thermal conductivity

A V Inyushkin, A N Taldenkov, J W Ager, E E Haller, H Riemann, N V Abrosimov, H Pohl, P Becker, Ultrahigh thermal conductivity of isotopically enriched silicon, JAP 123, 095112 (2018)

Ruf T, Henn R W, Asen-Palmer M, Gmelin E, Cardona M,. Pohl H-J, Devyatychc G G, Sennikov P G, Thermal conductivity of isotopically enriched silicon, Solid State Comm 115, 243 (2000)