Exciton-LO phonon dynamics in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">In</mml:mi><mml:mi mathvariant="normal">As</mml:mi><mml:mo>∕</mml:mo><mml:mi mathvariant="normal">Ga</mml:mi><mml:mi mathvariant="normal">As</mml:mi></mml:mrow></mml:math>quantum dots: Effects of zone-edge phonon damping

Machnikowski, Paweł; Jacak, Lucjan

doi:10.1103/physrevb.71.115309

Cited by 12 publications

(3 citation statements)

References 38 publications

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“…If the phonon is scattered at the interface by effects of disorder or anharmonicity, its lifetime may be only tens of vibrational periods or less. The spectral shape of a damped harmonic oscillator function has an asymmetrical broadening about the central frequency that can often account for the broadened phonon DOS of nanostructured materials [2,3,21,[31][32][33][34][35]40,41,65].…”

Section: Prior Work On Vibrations In Nanomaterialsmentioning

confidence: 99%

Thermodynamic stability and contributions to the Gibbs free energy of nanocrystalline Ni3Fe

Lohaus

Johnson

Ahnn

et al. 2020

Phys. Rev. Materials

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The heat capacities of nanocrystalline Ni 3 Fe and control materials with larger crystallites were measured from 0.4-300 K. The heat capacities were integrated to obtain the enthalpy, entropy, and Gibbs free energy and to quantify how these thermodynamic functions are altered by nanocrystallinity. From the phonon density of states (DOS) measured by inelastic neutron scattering, we find that the Gibbs free energy is dominated by phonons and that the larger heat capacity of the nanomaterial below 100 K is attributable to its enhanced phonon DOS at low energies. Besides electronic and magnetic contributions, the nanocrystalline material has an additional contribution at higher temperatures, consistent with phonon anharmonicity. The nanocrystalline material shows a stronger increase with temperature of both the enthalpy and entropy compared to the bulk sample. Its entropy exceeds that of the bulk material by 0.4 k B /atom at 300 K. This is insufficient to overcome the enthalpy of grain boundaries and defects in the nanocrystalline material, making it thermodynamically unstable with respect to the bulk control material.

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Section: Prior Work On Vibrations In Nanomaterialsmentioning

confidence: 99%

Thermodynamic stability and contributions to the Gibbs free energy of nanocrystalline Ni3Fe

Lohaus

Johnson

Ahnn

et al. 2020

Phys. Rev. Materials

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“…The exciton has a finite lifetime that in systems with small dimension is increased [24]. The interaction with phonons is the main reason for damping of the exciton [25]. Phonons in bulk matter have a continuous spectrum while in a confined system such as a QD their spectrum becomes discrete.…”

Section: Exciton Dynamics In a Qdmentioning

confidence: 99%

Nonlinear coherent state of an exciton in a wide quantum dot

Harouni

Roknizadeh

Naderi

2008

J. Phys. B: At. Mol. Opt. Phys.

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In this paper, we derive the dynamical algebra of a particle confined in an infinite spherical well by using the f -deformed oscillator approach. We consider an exciton with definite angular momentum in a wide quantum dot interacting with two laser beams. We show that under the weak confinement condition, and quantization of the center-of-mass motion of exciton, the stationary state of it can be considered as a special kind of nonlinear coherent states which exhibits the quadrature squeezing.

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“…For bulk phonons, we find a sharp zero-phonon line, which is here artifically broadened by introducing a finite decay time. This can be motivated by spontaneous recombination or temperature-dependent broadening mechanisms discussed in the literature recently for acoustic [27,29,30] or optical [31,32] phonons. In addition to the zero-phonon line, rather flat absorption features (sidebands) are present for detunings |ω−ω ren | 1 meV.…”

mentioning

confidence: 99%

Zero-Phonon Linewidth and Phonon Satellites in the Optical Absorption of Nanowire-Based Quantum Dots

et al. 2007

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The optical properties of quantum dots embedded in a catalytically grown semiconductor nanowire are studied theoretically. In comparison to dots in a bulk environment, the excitonic absorption is strongly modified by the one-dimensional character of the nanowire phonon spectrum. In addition to pronounced satellite peaks due to phonon-assisted absorption, we find a finite width of the zero-phonon line already in the lowest-order calculation.

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Exciton-LO phonon dynamics inInAs∕GaAsquantum dots: Effects of zone-edge phonon damping

Cited by 12 publications

References 38 publications

Thermodynamic stability and contributions to the Gibbs free energy of nanocrystalline Ni3Fe

Thermodynamic stability and contributions to the Gibbs free energy of nanocrystalline Ni3Fe

Nonlinear coherent state of an exciton in a wide quantum dot

Zero-Phonon Linewidth and Phonon Satellites in the Optical Absorption of Nanowire-Based Quantum Dots

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