Lattice Heat Capacity of Mesoscopic Nanostructures

First-principles lattice dynamics and heat capacity of BiFeO3

We study the lattice dynamics of bismuth ferrite (BiFeO3) rhombohedral ferroelectric (R3c) using first-principles density functional theory calculations and the direct force constant method. We determine the phonon dispersions, phonon density of states, and heat capacity. Special attention is paid to the heat capacity at low temperature, at which the present phonon calculations show significant...

Mesoscopic photon heat transistor.

We show that the heat transport between two bodies, mediated by electromagnetic fluctuations, can be controlled with an intermediate quantum circuit--leading to the device concept of a mesoscopic photon heat transistor (MPHT). Our theoretical analysis is based on a novel Meir-Wingreen-Landauer-type of conductance formula, which gives the photonic heat current through an arbitrary circuit elemen...

Thermal signatures of Little-Parks effect in the heat capacity of mesoscopic superconducting rings

Heat transport in mesoscopic systems

Phonon heat transport in mesoscopic systems is investigated using methods analogous to the Landauer description of electrical conductance. A “universal heat conductance” expression that depends on the properties of the conducting pathway only through the mode cutoff frequencies is derived. Corrections due to reflections at the junction between the thermal body and the conducting bridge are foun...

Magnetic extrema in electronic susceptibility and heat capacity of mesoscopic systems

Oscillating behaviour of the susceptibility χ and heat capacity C is considered for normal and superconducting mesoscopic systems (nanoclusters and quantum dots). It is proved that at low temperature an increasing magnetic field applied to a mesoscopic system generates local extrema of χ and C. A maximum for χ and a minimum for C simultaneously arise in those points of the field where crossings...