We investigate a squeezed thermal spin state of nonlinear spin waves in Heisenberg ferromagnets. In this state, the magnon system possesses a new kind of quasiparticle, the dressed magnon, whose mass is a monotonically decreasing function of temperature. The noise of one spin component in the...

A variational method and a memory function approach are adopted to investigate the electron mobility parallel to the interface for a model Al<Subscript>x</Subscript>Ga<Subscript>1-x</Subscript>As/GaAs heterojunction and its pressure effect by considering optical phonon modes (including both of the bulk longitudinal optical (LO) in the...</subscript></subscript>

For any crystal, the specific heat due to phonons can be written as Cph=AT3 where A is a constant and for a metal, the conduction electrons contribute a term that can be written as Cel(T)=γT. At low temperatures, however, other contributions to the specific heat may become significant. What is...