acoustic phonon scattering in bi2te3 sb2te3 superlattices
acoustic phonon scattering in bi2te3 sb2te3 superlattices
... reducing the lattice thermal conductivity through increasing phonon scattering by engineering superlattices, 1 filled cagelike struc- tures ͑i.e., skutterudites 2,3 ͒, nanowires, 4 and nanograins. 5 Thin-film ... reduction, while the remainder is attributed to the shorter phonon mean free path. 7 Direct measurements of optical phonons in Bi 2 Te 3 thin films and interface scattering...
Ngày tải lên: 06/05/2014, 08:53
reduction of coherent phonon lifetime in bi2te3 sb2te3 superlattices
... weaker phonon oscil- lation in the superlattice could be caused by a weaker cou- pling between electrons and the lattice in Bi 2 Te 3 or by rapid quenching of coherent phonons in Bi 2 Te 3 in a ... from interface scattering of phonons 9,10 as well as other processes. 7 Even so, there has been no documented evidence of reduction in phonon lifetimes, coherent or otherwise, that...
Ngày tải lên: 06/05/2014, 08:54
reduction of coherent phonon lifetime in bi2te3 sb2te3 superlattices
... weaker phonon oscil- lation in the superlattice could be caused by a weaker cou- pling between electrons and the lattice in Bi 2 Te 3 or by rapid quenching of coherent phonons in Bi 2 Te 3 in a ... from interface scattering of phonons 9,10 as well as other processes. 7 Even so, there has been no documented evidence of reduction in phonon lifetimes, coherent or otherwise, that...
Ngày tải lên: 06/05/2014, 08:58
origin of coherent phonons in bi2te3 excited by ultrafast laser pulses
... peaks in the thinner films are slightly wider, indicating longer interatomic distances or larger tensile stress and stronger anharmonicity in thinner films. The band gap in 064307-4 ORIGIN OF COHERENT ... causing coherent phonon oscillations, which is a refined picture of phonon generation process within DECP. In summary, we studied the coherent phonon dynamics in Bi 2 Te 3 using...
Ngày tải lên: 06/05/2014, 08:54
coherent phonon excitation in bismuth
... educational use including without limitation use in instruction at your institution, sending it to specific colleagues that you know, and providing a copy to your institution’s administrator. All ... reproduction and distribution, including without limitation commercial reprints, selling or licensing copies or access, or posting on open internet sites, your personal or institution’s website...
Ngày tải lên: 06/05/2014, 08:55
origin of coherent phonons in bi2te3 excited by ultrafast laser pulses
... peaks in the thinner films are slightly wider, indicating longer interatomic distances or larger tensile stress and stronger anharmonicity in thinner films. The band gap in 064307-4 ORIGIN OF COHERENT ... causing coherent phonon oscillations, which is a refined picture of phonon generation process within DECP. In summary, we studied the coherent phonon dynamics in Bi 2 Te 3 using...
Ngày tải lên: 06/05/2014, 08:58
Báo cáo " The dependence of the parametric transformation coefficient of acoustic and optical phonons in doped superlattices on concentration of impurities" pot
... operator X. Using Hamiltonian in Eq.(1) and realizing operator algebraic calculations, we obtain a set of coupled quantum kinetic equations for phonons. The equation for the acoustic phonons can ... equations for the phonons. The analytic expression of parametric transformation coefficient of acoustic and optical phonons in doped superlattices is obtained, that depends non-linear...
Ngày tải lên: 22/03/2014, 11:20
Tài liệu Đề tài " Global well-posedness and scattering for the energy-critical nonlinear Schr¨odinger equation in R3 " docx
... the quintic defocusing nonlinear Schr¨odinger equation (1.1). SCATTERING FOR 3D CRITICAL NLS 777 related to virial identities, and will be used later to deduce an interaction Morawetz inequality ... grateful to Monica Visan for pointing out an incorrect version of Lemma 3.10 in a previous version of this paper, and also in simplifying the proof of Lemma 3.9. SCATTERING FOR 3D CRITICAL...
Ngày tải lên: 16/02/2014, 06:20
Báo cáo khoa học: "Combining Acoustic and Pragmatic Features to Predict Recognition Performance in Spoken Dialogue Systems" pdf
... the remaining data into an 80% training and 20% test set. 3. Run TiMBL with all possible parameter set- tings on the generated training and test sets and store the best performing settings. 4. ... feature indicating the number of indefinite NPs that can be uniquely resolved in the Information State (#uniqueIndefinites, e.g. “a tower” where there is only one tower in the do- main). We includ...
Ngày tải lên: 08/03/2014, 04:22
Interplay between phonon confinement effect and anharmonicity in silicon nanowires
... nanostructuring, since the quantum confinement effect may cause the increase of the silicon band gap and shift the photoluminescence into the visible energy range. The increase in resulting structural ... calculated spectra obtained by taking into account the anharmonicity, which is incorporated through the three and four phonon decay processes into Raman scattering cross-section. This a...
Ngày tải lên: 16/03/2014, 15:17