Decay mechanism of optical phonons in γ-CuI
Temperature-dependent frequencies and linewidths of transverse-optical (TO) and longitudinal-optical (LO) in γ–CuI were fitted according to the anharmonic phonon coupling theory. The results indicate that the asymmetric three-phonon and symmetric four-phonon processes are both responsible for the de...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2019-05-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.5087172 |
| Summary: | Temperature-dependent frequencies and linewidths of transverse-optical (TO) and longitudinal-optical (LO) in γ–CuI were fitted according to the anharmonic phonon coupling theory. The results indicate that the asymmetric three-phonon and symmetric four-phonon processes are both responsible for the decay of LO and TO phonons in γ–CuI. Additionally, the possible decay channels are also suggested as: TO (135 cm-1) →LA (∼100 cm-1) +TA (35 cm-1) at L point and three TA (45cm-1) at X point; LO (152 cm-1) → LA (∼102 cm-1) +TA (∼50 cm-1) or three TA (50cm-1) at K point in Brillouin zone. These results are meaningful for the future applications of γ–CuI in optoelectronic and electronic fields. |
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| ISSN: | 2158-3226 |