Science (American Association for the Advancement of Science), 2012-11, Vol.338 (6109), p.936-939
2012
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Details
- Autor(en) / Beteiligte
- Titel
- Coherent Phonon Heat Conduction in Superlattices
- Ist Teil von
- Science (American Association for the Advancement of Science), 2012-11, Vol.338 (6109), p.936-939
- Ort / Verlag
- Washington, DC: American Association for the Advancement of Science
- Erscheinungsjahr
- 2012
- Quelle
- American Association for the Advancement of Science
- Beschreibungen/Notizen
- The control of heat conduction through the manipulation of phonons as coherent waves in solids is of fundamental interest and could also be exploited in applications, but coherent heat conduction has not been experimentally confirmed. We report the experimental observation of coherent heat conduction through the use of finite-thickness superlattices with varying numbers of periods. The measured thermal conductivity increased linearly with increasing total superlattice thickness over a temperature range from 30 to 150 kelvin, which is consistent with a coherent phonon heat conduction process. First-principles and Green's function-based simulations further support this coherent transport model. Accessing the coherent heat conduction regime opens a new venue for phonon engineering for an array of applications.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 0036-8075eISSN: 1095-9203DOI: 10.1126/science.1225549Titel-ID: cdi_osti_scitechconnect_1386877
- Format
- –
- Schlagworte
- Acoustical engineering, Ballistics, Coherence, Coherent scattering, Condensed matter: structure, mechanical and thermal properties, Conductive heat transfer, Conductivity, Electrical engineering, Exact sciences and technology, Gallium arsenide, Heat conductivity, Heat transfer, Lattice theory, Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties, Mechanical engineering, Phonons, Physics, Scattering, Simulation, solar (photovoltaic), solar (thermal), solid state lighting, phonons, thermal conductivity, thermoelectric, defects, mechanical behavior, charge transport, spin dynamics, materials and chemistry by design, optics, synthesis (novel materials), synthesis (self-assembly), synthesis (scalable processing), Solids, Superlattices, Surfaces and interfaces, thin films and whiskers (structure and nonelectronic properties), Temperature dependence, Thermal conductivity, Transport