Coherent microwave acoustic excitation of the inhomogeneously broadened state of the neutral acceptor In in crystalline Si has resulted in the first observation of phonon echoes below 0.1 K.
Phonon echoes, the acoustic analog of spin or photon echoes, are observed in the superconducting (T sub c =2.6K) metallic glass Pd sub (30) Zr sub (70) below 50 mK.
We measure the diagonal conductivity, sigma(xx), of a 2DEG as a function of varied applied voltage at integer filling factors (v) in the quantum Hall effect.
Stimulated Brillouin Scattering (SBS) is an example of traveling wave parametric interaction involving photons and phonons.
The concept of non-propagating phonon modes occupying part of the phonon spectrum is implicit in several proposals for the vibrational properties of disordered materials.
A universal but unexplained characteristic of glasses is the temperature-independent region or plateau in the thermal conductivity for temperatures 1-30K.
Raman scattering of optical phonons in polycrystalline A(2)Mn(2)O(7) (A = Y, In, and Tl) are reported as a function of temperature.
We present an investigation of the absorption edge in quasi- two-dimensional GaAs quantum well heterostructures.
High-precision thermal conductivity measurements have been performed on a single crystal of La1.67Sr0.33NiO4 as well as on polycrystalline samples of La2-xSrxNiO4 (x = 0.33,1) and Sr1.5La0.5MnO4.
We have studied the thermal conductivity kappa of stripe ordering La2-xSrxNiO4. In particular, long range stripe order is well established for x = 1/3.
