搜索结果: 1-15 共查到“物理学 phonons”相关记录20条 . 查询时间(0.031 秒)
Cornell engineers used precisely timed laser pulses to control changeable properties in a quantum material, pioneering a method that may have wide applications across a class of materials with immense...
Diffusion for a quantum particle coupled to phonons in $d\geq 3$
quantum particle phonons Mathematical Physics
2011/7/25
Abstract: We prove diffusion for a quantum particle coupled to a field of bosons (phonons or photons). The importance of this result lies in the fact that our model is fully Hamiltonian and randomness...
Perturbation theory of the mass enhancement for a polaron coupled to acoustic phonons
Perturbation theory of the mass enhancement acoustic phonons
2010/11/8
We use both a perturbative Green’s function analysis and standard perturbative quantum me-
chanics to calculate the decrease in energy and the effective mass for an electron interacting with acoustic...
Large-amplitude chirped coherent phonons in tellurium mediated by ultrafast photoexcited carrier diffusion
Large-amplitude chirped coherent phonons tellurium ultrafast photoexcited carrier diffusion
2010/11/2
We report femtosecond time-resolved reflectivity measurements of coherent phonons in tellurium
performed over a wide range of temperatures (3K to 296K) and pump laser intensities. A totally
symmetri...
Forcibly driven coherent soft phonons in GeTe with intense THz-rate pump fields
coherent soft phonons GeTe intense THz-rate pump fields
2010/11/1
We propose an experimental technique to generate large amplitude coherent phonons with irradiation of THz-rate pump pulses and to study the dynamics of phase transition in GeTe ferroelectrics.When a s...
Ultrafast dephasing of coherent optical phonons in atomically controlled GeTe/Sb$_{2}$Te$_{3}$ superlattices
Ultrafast dephasing of coherent optical phonons
2010/11/1
Femtosecond dynamics of coherent optical phonons in GeTe/Sb2Te3 superlattices (SLs), a new
class of semiconductor SLs with three different states, have been investigated by using a reflectiontype pum...
Contribution of interband effects caused by long-wavelength transverse optical phonons to electron-phonon coupling in doped polar insulators
Contribution of interband effects electron-phonon coupling doped polar insulators
2010/11/1
We estimate the contribution of the long-wavelength el–TO–ph interaction and discuss the effect it has on electron pairing in doped polar systems like SrTiO3 and PbTe. The analytical and numerical res...
Ultrafast dephasing of coherent optical phonons in atomically controlled GeTe/Sb$_{2}$Te$_{3}$ superlattices
Ultrafast dephasing coherent optical phonons
2010/11/1
Femtosecond dynamics of coherent optical phonons in GeTe/Sb$_{2}$Te$_{3}$ superlattices (SLs), a new class of semiconductor SLs with three different states, have been investigated by using a reflecti...
Heat can be conducted across a nanometre-sized vacuum gap – something that was deemed impossible until now. So say researchers at the Air Force Research Laboratory in Ohio who have found that the heat...
Dual Space Analyzing Based on Symmetry Properties for
Phonons fo Si Quantum Dot
phonon modes quantum dots dual space analyzing
2007/8/15
2002Vol.38No.1pp.91-98DOI:
Dual Space Analyzing Based on Symmetry Properties for
Phonons fo Si Quantum Dot
QIN Guo-Yi,1 REN Shang-Fen,2 and ZHANG Zhi-Yong3
1 Department ...
Correct Evaluation of the Effect of Transverse Effective
Charges on Phonons in AlAs Quantum Dots
quantum dot semiconductor
2007/8/15
2003Vol.40No.6pp.727-734DOI:
Correct Evaluation of the Effect of Transverse Effective
Charges on Phonons in AlAs Quantum Dots
QIN Guo-Yi
Department of Physics, Nanjing ...
Vibration Spectrums of Polar Interface Optical Phonons in GaAs/AlAs Cylindrical Quantum Dots
phonon modes vibration spectrums cylindrical quantum dots
2007/8/15
2005Vol.43No.2pp.333-336DOI:
Vibration Spectrums of Polar Interface Optical Phonons in GaAs/AlAs Cylindrical Quantum Dots
ZHANG Li
School of Physics, Peking University, ...
Phonons in Quantum-Dot Quantum Well
quantum-dot quantum well phonons metal-semiconductor interface
2007/8/15
2004Vol.42No.4pp.609-618DOI:
Phonons in Quantum-Dot Quantum Well
QIN Guo-Yi
Department of Physics and Jiangsu Provincial Key Laboratory of Photonic and Electronic Materi...
Variational Ground State Approach for A Tunnelling Exciton Coupled to Phonons
Hamiltonian Ground state approximation Vacuum state
2007/2/28
In this paper a variational study of a tunnelling exciton (Frenkel exciton) coupled to an arbitrary number of phonon modes is presented. The results of our model are presented both for weak non-adiaba...
Interface and Surface Optical Phonons Spectra in Wurtzite Nitride Quantum Well Wires: Size and Dielectric Effects
Optical Phonon Vibration Spectra Wurtzite QWW
2006/11/30
By employing the method of electrostatic potential expansion, the interface optical (IO) and surface optical (SO) phonon modes and the corresponding Fröhlich-like electron-phonon-interaction Hami...