The description of phonon heat conduction has typically been based on Fourier diffusion
theory. However, over the past three decades, a host of interesting phonon transport …

Strontium titanate is a wide-gap semiconductor avoiding a ferroelectric instability thanks to
quantum fluctuations. This proximity leads to strong screening of static Coulomb interaction …

Wavelike thermal transport in solids, referred to as second sound, is an exotic phenomenon
previously limited to a handful of materials at low temperatures. The rare occurrence of this …

The conduction of heat in two dimensions displays a wealth of fascinating phenomena of
key relevance to the scientific understanding and technological applications of graphene …

We present a study of thermal conductivity, κ, in undoped and doped strontium titanate in a
wide temperature range (2–400 K) and detecting different regimes of heat flow. In undoped …

In the hydrodynamic regime, phonons drift with a nonzero collective velocity under a
temperature gradient, reminiscent of viscous gas and fluid flow. The study of hydrodynamic …

Resonant piezoelectric spectroscopy shows polar resonances in paraelectric SrTiO 3 at
temperatures below 80 K. These resonances become strong at T< 40 K. The resonances are …

A marked change in anelastic properties, namely, elastic softening accompanied by
increased damping, has been observed in a single crystal of SrTiO 3 below∼ 50 K by …

Phonon hydrodynamics is an exotic phonon transport phenomenon that challenges the
conventional understanding of diffusive phonon scattering in crystalline solids. It features a …

In recent times, the unique collective transport physics of phonon hydrodynamics motivates
theoreticians and experimentalists to explore it in micro-and nanoscale and at elevated …