Jensan Tsai

Electronic structure and transport properties of La0.7Ce0.3MnO3

X-ray absorption spectroscopy (XAS), optical reflectance spectroscopy, and the Hall effect measurements were used to investigate the electronic structure in

Magnetoacoustic effects of nonparabolic band structure in nondegenerate piezoelectric semiconductors

{\mathrm{La}}_{0.7}{\mathrm{Ce}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}

Hall effect of nonparabolicity in a nondegenerate indium antimonide

thin films (LCeMO). The XAS results are consistent with those obtained from

Effect of velocity operator on acoustic‐harmonic generation in n‐type piezoelectric semiconductors

\mathrm{LDA}+U

Amplification of total‐reflection‐mode acoustic surface waves in n‐type GaAs films

calculations. In that the doping of Ce has shifted up the Fermi level and resulted in marked shrinkage of hole pockets originally existing in

Magneto-acoustic effect in n-InSb at low temperatures

{\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}

Effect of nonparabolicity on free‐carrier absorption in semiconductors at quantizing magnetic fields

(LCaMO). The Hall measurements indicate that in LCeMO the carriers are still displaying the characteristics of holes as

Coupling mechanisms of acoustic second-harmonic generation in piezoelectric semiconductors

\mathrm{LDA}+U

Effect of nonparabolicity on amplification of eigenmode acoustic waves in piezoelectric semiconductor films

calculations predict. Analyses of the optical reflectance spectra evidently disapprove the scenario that the present LCeMO might have been dominated by the La-deficient phases.

Effect of nonparabolicity on longitudinal conductivity of degenerate semiconductors for transverse ultrasound in strong magnetic fields

Effects of ultrasonic waves propagating at an angle ϑ relative to the direction of a dc magnetic field in nondegenerate piezoelectric semiconductors such as n‐type InSb have been studied by using a quantum treatment which is valid at high frequencies and in strong magnetic fields. The interaction of conduction electrons with waves is via deformation‐potential and piezoelectric couplings. Results show that variation of the direction of the magnetic field with respect to the direction of propagation of ultrasonic waves will affect the ultrasonic absorption coefficient and change in sound velocity. Therefore the absorption coefficient and change in sound velocity depend strongly on the dc magnetic field, the sound frequency, the temperature, and the direction of the propagation of ultrasonic waves relative to that of the field.