Coherent acoustic phonons in PbTe quantum dots

Thoen, E.R.; Steinmeyer, Günter; Langlois, Pierre; Ippen, Erich P.; Tudury, G.E.; Cruz, Carlos Henrique de Brito; Barbosa, L. C.; César, Carlos L.

doi:10.1063/1.122406

Cited by 50 publications

(43 citation statements)

References 18 publications

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“…Resonant excitation of quantum dots in conjunction with strong electron-phonon coupling leads to a modulation of a four wave mixing signal with the frequency of the LO phonon in CdSe quantum dots 128,129] and of the LO and TO mode in InP quantum dots 131]. Coherent acoustic modes could be observed in resonant pump-probe experiments on PbS quantum dots 132,133]. The generation mechanism is based on deformation-potential coupling of the lowest-order spheroidal acoustic mode to the quantum-dot excitons 132].…”

Section: Recent Developmentsmentioning

confidence: 98%

Coherent phonons in condensed media

Dekorsy¹,

Cho²,

Kurz³

2000

Topics in Applied Physics

139

127

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Abstract. The impulsive excitation and phase-sensitive detection of coherent phonons and phonon-polaritons provide a detailed insight i n to the dynamical properties of matter. The experiments are based on optical pump-probe techniques with femtosecond time resolution. These techniques enable the detection of amplitude and phase of the coherent lattice motion simultaneously. F requencies in the THz range and dephasing times in the picosecond range can be obtained with high accuracy. Especially in semiconductors and semiconductor heterostructures, where a coherent phonon mode and free carriers are excited simultaneously, important information about carrier-phonon interaction far away from equilibrium is obtained. This paper presents an overview of recent a c hievements in this vivid eld of condensed matter physics.

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Section: Recent Developmentsmentioning

confidence: 98%

Coherent phonons in condensed media

Dekorsy¹,

Cho²,

Kurz³

2000

Topics in Applied Physics

139

127

View full text Add to dashboard Cite

show abstract

“…Time-domain detection and investigation of the acoustic vibration of nanoparticles were first demonstrated on ensembles of single material nanoparticles: either metallic [42,[44][45][46]53,92,155,163] or semiconductor [43,164] nanospheres. They were subsequently extended to many other shapes and compositions including multi-metallic systems [58,60,63,109].…”

Section: Experimental Investigations: Ensembles Of Nano-objectsmentioning

confidence: 99%

Acoustic vibrations of metal nano-objects: Time-domain investigations

et al. 2015

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“…In 1989, Wilson made a simple analysis of the observation of coherent acoustic phonons in semiconductor superlattices [37]. Due to the advances in nanofabrication technology, coherent acoustic phonons of picosecond oscillation period have now been observed in semiconductor superlattices [38,39,40,41], quantum dots [42,43], and metallic nanocrystallites [44]. In such structures, the underlying length of the heterostructures or the size of the nanoparticles determines the characteristic phonon wavelength.…”

Section: Introductionmentioning

confidence: 98%

Generation of Coherent Acoustic Phonons in Nitride-Based Semiconductor Nanostructures

Chern

Sun

Sanders

et al. 2004

Topics in Applied Physics

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Abstract. In this chapter, we review experimental and theoretical aspects of coherent acoustic phonon generation in nitride-based semiconductor nanostructures, with particular application to InGaN/GaN multiquantum wells (MQWs). We first discuss the experimental generation and detection of coherent longitudinal-acoustic (LA) phonon oscillations in InGaN/GaN MQWs using the transmission-type pump-probe technique. With UV femtosecond pulse excitation, photogenerated carriers screen the piezoelectric field and initiate the displacive coherent phonon oscillations. The spatial wavevector of the periodic carrier distribution determines the phonon-oscillation frequency. The induced acoustic phonon oscillations result in a piezoelectric field modulation that then causes an absorption variation through the Franz-Keldysh effect. Injecting another control pulse can further control the resulting coherent phonon oscillations. Both magnitude and phase manipulation can be achieved by controlling the intensity and time delay of the control pulse. After reviewing the experimental results, we then present a microscopic theory of the generation and propagation of coherent LA phonons in wurtzite semiconductor MQWs. Under typical experimental conditions, the propagation of coherent LA phonons is described by a loaded-string equation for the lattice displacement, where the timeand position-dependent loading term is a function of the photoexcited carrier density. We note that this differs from the situation in which coherent LO-phonon scillations are generated in bulk systems where the coherent LO phonons obey a forced-oscillator equation as opposed to a loaded-string equation. Both deformation-potential and piezoelectric-coupling mechanisms contribute to the driving force in the loaded-string equation. We also discuss a macroscopic theory for the generation and dynamics of coherent acoustic phonons in wurtzite semiconductor nanostructures. This approach is based on macroscopic continuum constitution equations for piezoelectric wurtzite semiconductors. Starting from Poisson's equation and the dynamic elastic equation, a vector-loaded wave equation is obtained. By projecting the corresponding equation to eigenvectors of the elastic Christoffel equation, the loaded-string equation can also be obtained. The macroscopic approach is then used to study the orientation effects on the generation of coherent acoustic phonons and it is found that large coherent transverse acoustic phonon oscillation can be generated when the growth direction of the nanostructure is along Kong-Thon Tsen (Ed.): Ultrafast

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Coherent acoustic phonons in PbTe quantum dots

Abstract: Articles you may be interested inTemperature dependence of electronic energy transfer in PbS quantum dot films Appl. Phys. Lett. 95, 083102 (2009); 10.1063/1.3213349 PbTe and SnTe quantum dot precipitates in a CdTe matrix fabricated by ion implantation

Cited by 50 publications

References 18 publications

Coherent phonons in condensed media

Coherent phonons in condensed media

Acoustic vibrations of metal nano-objects: Time-domain investigations

Generation of Coherent Acoustic Phonons in Nitride-Based Semiconductor Nanostructures

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