期刊
PHYSICAL REVIEW B
卷 95, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.95.195423
关键词
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资金
- DFG (German Research Foundation) [SFB/TRR21]
- EU via the SIQS project
- EU via the RYSQ project
- National Science Foundation [PHY-1306638, PHY-1207881, PHY-1520915]
- Air Force Office of Scientific Research Grant [FA9550-14-1-0287]
- DFG via a Heisenberg fellowship
- Direct For Mathematical & Physical Scien
- Division Of Physics [1520915, 1306638] Funding Source: National Science Foundation
When a semiconductor absorbs light, the resulting electron-hole superposition amounts to a uncontrolled quantum ripple that eventually degenerates into diffusion. If the conformation of these excitonic superpositions could be engineered, though, they would constitute a new means of transporting information and energy. We show that properly designed laser pulses can be used to create such excitonic wave packets. They can be formed with a prescribed speed, direction, and spectral make-up that allows them to be selectively passed, rejected, or even dissociated using superlattices. Their coherence also provides a handle for manipulation using active, external controls. Energy and information can be conveniently processed and subsequently removed at a distant site by reversing the original procedure to produce a stimulated emission. The ability to create, manage, and remove structured excitons comprises the foundation for optoexcitonic circuits with application to a wide range of quantum information, energy, and light-flowtechnologies. The paradigm is demonstrated using both tight-binding and time-domain density functional theory simulations.
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