Electron-phonon scattering rates in complex polar crystals

Prange, Micah P.; Campbell, Luke W.; Kerisit, Sebastien N.

doi:10.1103/physrevb.96.104307

Cited by 8 publications

(3 citation statements)

References 63 publications

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“…Thermalization stage is controlled by interaction of hot carriers with kinetic energy below the forbidden gap energy with phonons. Simple effective mass models are shown to be not applicable for the description of electron-phonon interaction and even for the prediction of group velocities of carriers with sufficient kinetic energy, so great attention was paid to the description of these properties in real crystals with complicated band structures [86], [182]- [184]. In general, effective mass approximation results in overestimation of the thermalization length in most crystals since group velocities and mobilities of hot carriers are overestimated.…”

Section: Theory and Modelingmentioning

confidence: 99%

Needs, Trends, and Advances in Inorganic Scintillators

Dujardin

Auffray

Bourret-Courchesne

et al. 2018

IEEE Trans. Nucl. Sci.

387

240

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This paper presents new developments in inorganic scintillators widely used for radiation detection. It addresses major emerging research topics outlining current needs for applications and material sciences issues with the overall aim to provide an up-to-date picture of the field. While the traditional forms of scintillators have been crystals and ceramics, new research on films, nanoparticles, and microstructured materials is discussed as these material forms can bring new functionality and therefore find applications in radiation detection. The last part of the contribution reports on the very recent evolutions of the most advanced theories, methods, and analyses to describe the scintillation mechanisms.

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Section: Theory and Modelingmentioning

confidence: 99%

Needs, Trends, and Advances in Inorganic Scintillators

Dujardin

Auffray

Bourret-Courchesne

et al. 2018

IEEE Trans. Nucl. Sci.

387

240

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“…Cesium halides (e.g., CsCl, CsBr, CsI) possess fascinating electro-optic, electromechanic and large dielectric constants properties [1][2][3]. These outstanding physical properties are closely related to the thermal transport properties, particularly the lattice thermal conductivity (κ) [4].…”

Section: ⅰ Introductionmentioning

confidence: 99%

Low-temperature anharmonicity and the thermal conductivity of cesium iodide

Wei¹,

Yu²,

Yang³

et al. 2019

Phys. Rev. B

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Cesium halide has a simple cubic crystal structure and hosts low thermal conductivity, but its microscopic mechanism has not been fully understood. In the present work, we took cesium iodide (CsI) single crystal as an example, to investigate the lattice dynamics and thermal conductivity by performing inelastic neutron scattering (INS), heat transport measurements and the first-principles calculations. The temperature dependent phonon dispersions of CsI were obtained from INS and the low temperature anharmonicity of transverse optic (o) and transverse acoustic (a) phonon modes in CsI was observed. By performing the thermal conductivity measurement and first-principles calculations, it is shown that the low thermal conductivity of CsI originates from the combined effect of the small phonon group velocities and the large phonon scattering rates, which is dominated by the (a, a, a) and (a, a, o) phonon scattering processes. This work highlights the importance of phonon anharmonicity in lattice dynamics, which shed light on the design of materials with low thermal conductivity.

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“…Alkali halides are widely utilized in new opto-electronic devices due to fascinating electro-optic properties, [1] electromechanical properties, [2] and large electronegativity and dielectric constants. [3] These prominent properties associate closely with phonon thermal transport properties, such as lattice vibrations [4][5] and thermal conductivities. [6][7] For most compounds in alkali halides, the thermal conductivities are relatively low, and the values at room temperature range from 1 to 7 W/mK.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Thermal Conductivity Induced by High Dispersive Optical Phonons in Rubidium and Cesium Halides

Chang¹,

Yuan²,

Li³

et al. 2022

ES Energy Environ.

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Knowledge of lattice dynamics is essential for understanding the physical properties of materials and optimizing the performance for applications. Alkali halides (MX, M=Na, K, Rb, and Cs; X=Cl, Br, and I) have been widely recognized for their simple crystal structures and low thermal conductivities. At room temperature, the thermal conductivity (κ) of RbBr is nearly twice as large as that of RbCl and RbI, while the thermal conductivities of three compounds in CsX halides are comparable. These thermal conductivity trends with increased atomic mass are significantly different from the common sense that the thermal conductivity conventionally decreases with the increasing atomic mass and decreasing electronegativity difference. However, little attention has been paid to the microscopic mechanism of these anomalous thermal conductions in RbX and CsX. Here, we report a systematic investigation of the thermal transport properties in alkali halides by the Boltzmann transport equation based on first-principles calculations. The results show that the anomalous thermal conductivity trends of RbX and CsX mainly attribute to the disparity of optical phonons in each compound. The more dispersive the optical phonons, the greater their contribution to the thermal conductivity, and thus the thermal conductivities of compounds with heavier atoms are enhanced. The disparity of optical phonons originates from the mass difference in the compound. Our work offers deeper insight into the unusual phonon thermal transport phenomenon in alkali halides, and provides fundamental reference for rooting the thermal conductivities in related functional materials and finding novel materials with thermal conduction beyond the conventional cognition.

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Electron-phonon scattering rates in complex polar crystals

Cited by 8 publications

References 63 publications

Needs, Trends, and Advances in Inorganic Scintillators

Needs, Trends, and Advances in Inorganic Scintillators

Low-temperature anharmonicity and the thermal conductivity of cesium iodide

Anomalous Thermal Conductivity Induced by High Dispersive Optical Phonons in Rubidium and Cesium Halides

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