نتایج جستجو برای: phonon dispersion

تعداد نتایج: 76044  

1998
Jianjun Xie Stefano de Gironcoli Stefano Baroni Matthias Scheffler

The thermal properties of silver are calculated within the quasiharmonic approximation, by using phonon dispersions from density-functional perturbation theory, and the pseudopotential plane-wave method. The resulting free energy provides predictions for the temperature dependence of various quantities such as the equilibrium lattice parameter, the bulk modulus, and the heat capacity. Our resul...

Journal: :Physical review letters 2008
H Iwasawa J F Douglas K Sato T Masui Y Yoshida Z Sun H Eisaki H Bando A Ino M Arita K Shimada H Namatame M Taniguchi S Tajima S Uchida T Saitoh D S Dessau Y Aiura

Angle-resolved photoemission spectroscopy with low-energy tunable photons along the nodal direction of oxygen isotope substituted Bi(2)Sr(2)CaCu(2)O(8+delta) reveals a distinct oxygen isotope shift near the electron-boson coupling "kink" in the electronic dispersion. The magnitude (a few meV) and direction of the kink shift are as expected due to the measured isotopic shift of phonon frequency,...

2009
S. Viola Kusminskiy D. K. Campbell H. Castro Neto

We calculate the phonon spectrum for a graphene sheet resulting from the model proposed by Lenosky et al. Nature London 355, 333 1992 for the free energy of the lattice. This model takes into account not only the usual bond-bending and stretching terms, but it also captures the possible misalignment of the pz orbitals. We compare our results with previous models used in the literature and with ...

Journal: :Nano letters 2014
Victor W Brar Min Seok Jang Michelle Sherrott Seyoon Kim Josue J Lopez Laura B Kim Mansoo Choi Harry Atwater

Infrared transmission measurements reveal the hybridization of graphene plasmons and the phonons in a monolayer hexagonal boron nitride (h-BN) sheet. Frequency-wavevector dispersion relations of the electromagnetically coupled graphene plasmon/h-BN phonon modes are derived from measurement of nanoresonators with widths varying from 30 to 300 nm. It is shown that the graphene plasmon mode is spl...

2012
Denis L. Nika Alexander A. Balandin

Properties of phonons – quanta of the crystal lattice vibrations – in graphene have attracted strong attention of the physics and engineering communities. Acoustic phonons are the main heat carriers in graphene near room temperature while optical phonons are used for counting the number of atomic planes in Raman experiments with few-layer graphene. It was shown both theoretically and experiment...

Journal: :The Journal of chemical physics 2016
Ji-Hang Zou Zhen-Qiang Ye Bing-Yang Cao

Phonon thermal transport in graphene has attracted significant interest in recent years. Phonon thermal properties of graphene are investigated by molecular dynamics simulations using the Tersoff, Tersoff-2010, REBO, and AIREBO potentials. By calculating the phonon properties and thermal conductivity of graphene, the performance of the potentials is evaluated based on comparisons with experimen...

2008
E P Pokatilov S Askerov

We have studied the electron mobility in the AlN/GaN/AlN heterostructures with the nanometer scale thickness by taking into account multiple quantized electron subbands and the confined optical phonon dispersion. It was shown that the inter-subband electronic transitions play an important role in limiting the electron mobility in the heterostructures when the energy separation between one of th...

2017
M. Dörr H. Gerlach J. Kalus M. Warth

2,3-dimethylanthracene (2,3-DMA, C16H14) crystallizes in a pseudocentrosymmetric triclinic lattice with two molecules per unit cell showing dipolar structural disorder of the acentric molecules. Using powder samples the amplitude weighted phonon density of states was measured by inelastic incoherent neutron scattering for different degrees of deuteration. The differences in the resulting spectr...

2017
Francesco De Leonardis Richard A. Soref Vittorio M. N. Passaro

In this paper we present a physical discussion of the indirect two-photon absorption (TPA) occuring in silicon carbide with either cubic or wurtzite structure. Phonon-electron interaction is analyzed by finding the phonon features involved in the process as depending upon the crystal symmetry. Consistent physical assumptions about the phonon-electron scattering mechanisms are proposed in order ...

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