Academic Journal
Quantum control of excitons for reversible heat transfer
| العنوان: | Quantum control of excitons for reversible heat transfer |
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| المؤلفون: | Eastham, Paul |
| سنة النشر: | 2019 |
| المجموعة: | The University of Dublin, Trinity College: TARA (Trinity's Access to Research Archive) |
| مصطلحات موضوعية: | Excitons, Electron-hole pairs, Reversible heat transfer, Nanoscience & Materials, Smart & Sustainable Planet, QUANTUM DOTS, QUANTUM OPTICS, SEMICONDUCTOR DEVICES AND MATERIALS, THERMODYNAMICS, Theoretical physics |
| الوصف: | PUBLISHED ; Lasers, photovoltaics, and thermoelectrically-pumped light emitting diodes are thermodynamic machines which use excitons (electron-hole pairs) as the working medium. The heat transfers in such devices are highly irreversible, leading to low efficiencies. Here we predict that reversible heat transfers between a quantum-dot exciton and its phonon environment can be induced by laser pulses. We calculate the heat transfer when a quantum-dot exciton is driven by a chirped laser pulse. The reversibility of this heat transfer is quantified by the efficiency of a heat engine in which it forms the hot stroke, which we predict to reach 95% of the Carnot limit. This performance is achieved by using the time-dependent laser-dressing of the exciton to control the heat current and exciton temperature. We conclude that reversible heat transfers can be achieved in excitonic thermal machines, allowing substantial improvements in their efficiency. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | Communications Physics; C. N. Murphy and P. R. Eastham, Quantum control of excitons for reversible heat transfer, Communications Physics, 2, 2019, 120; Y; https://www.nature.com/articles/s42005-019-0215-8; http://hdl.handle.net/2262/89660; http://people.tcd.ie/easthamp; 207700; http://dx.doi.org/10.1038/s42005-019-0215-8; orcid:0000-0002-7054-1457 |
| DOI: | 10.1038/s42005-019-0215-8 |
| الاتاحة: | http://hdl.handle.net/2262/89660 https://www.nature.com/articles/s42005-019-0215-8 http://people.tcd.ie/easthamp https://doi.org/10.1038/s42005-019-0215-8 |
| Rights: | Y ; openAccess |
| رقم الانضمام: | edsbas.7AD57FD0 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1038/s42005-019-0215-8 |
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