Expanding the bandgap of thermal phonons by using supercrystals
Thermocrystals constitute a new type of periodic material that can be used to control heat flow. An important issue is how to widen the bandgap of thermocrystals to cover more of the thermal spectrum, and this is related to the efficiency of manipulating the transport of heat flow in a thermocrystal...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020-06-01
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| Series: | Results in Physics |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379719336113 |
| _version_ | 1818932666796343296 |
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| author | Kaiyuan Xu Chun Jiang |
| author_facet | Kaiyuan Xu Chun Jiang |
| author_sort | Kaiyuan Xu |
| collection | DOAJ |
| description | Thermocrystals constitute a new type of periodic material that can be used to control heat flow. An important issue is how to widen the bandgap of thermocrystals to cover more of the thermal spectrum, and this is related to the efficiency of manipulating the transport of heat flow in a thermocrystal. In this letter, a one-dimensional supercrystal composed of multiple lattices is proposed, and the dispersion relation and heat flux transmittance of thermocrystals and thermo-supercrystals are simulated. The results show that supercrystals are effective for widening the bandgap of thermal phonons; thus, supercrystals are more efficient at preventing thermal phonons than are thermocrystals. As an example, the thermal conductivity is reduced by 37% in a supercrystal with five different lattice constants, compared to a reduction of only 19.6% in thermocrystals. This supercrystal can be used to achieve an effective thermal-conductivity barrier with general materials, which will be very important for manipulating heat conduction. |
| first_indexed | 2024-12-20T04:36:07Z |
| format | Article |
| id | doaj.art-26095687daaf4369aeb2e00ecaa3a934 |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-12-20T04:36:07Z |
| publishDate | 2020-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-26095687daaf4369aeb2e00ecaa3a9342022-12-21T19:53:15ZengElsevierResults in Physics2211-37972020-06-0117103015Expanding the bandgap of thermal phonons by using supercrystalsKaiyuan Xu0Chun Jiang1State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, ChinaCorresponding author.; State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, ChinaThermocrystals constitute a new type of periodic material that can be used to control heat flow. An important issue is how to widen the bandgap of thermocrystals to cover more of the thermal spectrum, and this is related to the efficiency of manipulating the transport of heat flow in a thermocrystal. In this letter, a one-dimensional supercrystal composed of multiple lattices is proposed, and the dispersion relation and heat flux transmittance of thermocrystals and thermo-supercrystals are simulated. The results show that supercrystals are effective for widening the bandgap of thermal phonons; thus, supercrystals are more efficient at preventing thermal phonons than are thermocrystals. As an example, the thermal conductivity is reduced by 37% in a supercrystal with five different lattice constants, compared to a reduction of only 19.6% in thermocrystals. This supercrystal can be used to achieve an effective thermal-conductivity barrier with general materials, which will be very important for manipulating heat conduction.http://www.sciencedirect.com/science/article/pii/S2211379719336113ThermocrystalSupercrystalThermal spectrumBandgap |
| spellingShingle | Kaiyuan Xu Chun Jiang Expanding the bandgap of thermal phonons by using supercrystals Results in Physics Thermocrystal Supercrystal Thermal spectrum Bandgap |
| title | Expanding the bandgap of thermal phonons by using supercrystals |
| title_full | Expanding the bandgap of thermal phonons by using supercrystals |
| title_fullStr | Expanding the bandgap of thermal phonons by using supercrystals |
| title_full_unstemmed | Expanding the bandgap of thermal phonons by using supercrystals |
| title_short | Expanding the bandgap of thermal phonons by using supercrystals |
| title_sort | expanding the bandgap of thermal phonons by using supercrystals |
| topic | Thermocrystal Supercrystal Thermal spectrum Bandgap |
| url | http://www.sciencedirect.com/science/article/pii/S2211379719336113 |
| work_keys_str_mv | AT kaiyuanxu expandingthebandgapofthermalphononsbyusingsupercrystals AT chunjiang expandingthebandgapofthermalphononsbyusingsupercrystals |