Effects of strong anharmonicity in the spectra of optical phonons and polaritons

1985 ◽  
Vol 28 (6) ◽  
pp. 484-505 ◽  
Author(s):  
Vladimir M Agranovich ◽  
I I Lalov
Keyword(s):  
Optical Phonons ◽  
Strong Anharmonicity

Experimental validation of high thermoelectric performance in RECuZnP2 predicted by high-throughput DFT calculations

2021 ◽  
Author(s):  
Jan-Hendrik Pöhls ◽  
Sevan Chanakian ◽  
Junsoo Park ◽  
Alex M. Ganose ◽  
Alexander Dunn ◽  
...  
Keyword(s):  
Electron Transport ◽  
Dft Calculations ◽  
High Throughput ◽  
Experimental Validation ◽  
Thermoelectric Performance ◽  
Optical Phonons ◽  
Thermal Measurements ◽  
Strong Anharmonicity ◽  
Thermal Conductivities

Predictions of high thermoelectric performance in RECuZnP2 were verified by elastic, electrical, and thermal measurements. Low thermal conductivities result from strong anharmonicity, with electron transport limited by polar optical phonons.

Strong anharmonicity in tin monosulfide evidenced by local distortion, high-energy optical phonons, and anharmonic potential

2021 ◽  
Vol 103 (19) ◽  
Author(s):  
Peng Wu ◽  
Kang Xia ◽  
Kunling Peng ◽  
Takashi Honda ◽  
Kazutaka Ikeda ◽  
...  
Keyword(s):  
High Energy ◽  
Optical Phonons ◽  
Local Distortion ◽  
Anharmonic Potential ◽  
Strong Anharmonicity

Inelastic scattering at surfaces and interfaces

1986 ◽  
Vol 44 ◽  
pp. 392-393
Author(s):  
R. H. Ritchie ◽  
A. Howie
Keyword(s):  
Inelastic Scattering ◽  
Surface Properties ◽  
Correlation Energy ◽  
Condensed Matter ◽  
Charged Particles ◽  
Condensed Matter Physics ◽  
Optical Phonons ◽  
Exchange Correlation ◽  
Surfaces And Interfaces ◽  
Inelastic Interactions

An important part of condensed matter physics in recent years has involved detailed study of inelastic interactions between swift electrons and condensed matter surfaces. Here we will review some aspects of such interactions.Surface excitations have long been recognized as dominant in determining the exchange-correlation energy of charged particles outside the surface. Properties of surface and bulk polaritons, plasmons and optical phonons in plane-bounded and spherical systems will be discussed from the viewpoint of semiclassical and quantal dielectric theory. Plasmons at interfaces between dissimilar dielectrics and in superlattice configurations will also be considered.

scholarly journals Giant phonon anomalies in the proximate Kitaev quantum spin liquid α-RuCl3

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Haoxiang Li ◽  
T. T. Zhang ◽  
A. Said ◽  
G. Fabbris ◽  
D. G. Mazzone ◽  
...  
Keyword(s):  
Acoustic Phonon ◽  
Energy Scale ◽  
Quantum Spin ◽  
Majorana Fermion ◽  
Spin Liquid ◽  
Optical Phonons ◽  
Large Intensity ◽  
Topological Quantum ◽  
Topological State ◽  
Quantum Spin Liquid

AbstractThe Kitaev quantum spin liquid epitomizes an entangled topological state, for which two flavors of fractionalized low-energy excitations are predicted: the itinerant Majorana fermion and the Z2 gauge flux. It was proposed recently that fingerprints of fractional excitations are encoded in the phonon spectra of Kitaev quantum spin liquids through a novel fractional-excitation-phonon coupling. Here, we detect anomalous phonon effects in α-RuCl3 using inelastic X-ray scattering with meV resolution. At high temperature, we discover interlaced optical phonons intercepting a transverse acoustic phonon between 3 and 7 meV. Upon decreasing temperature, the optical phonons display a large intensity enhancement near the Kitaev energy, JK~8 meV, that coincides with a giant acoustic phonon softening near the Z2 gauge flux energy scale. These phonon anomalies signify the coupling of phonon and Kitaev magnetic excitations in α-RuCl3 and demonstrates a proof-of-principle method to detect anomalous excitations in topological quantum materials.

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