期刊
NATURE NANOTECHNOLOGY
卷 17, 期 2, 页码 148-+出版社
NATURE PORTFOLIO
DOI: 10.1038/s41565-021-01026-8
关键词
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资金
- Defense Advanced Research Projects Agency (DARPA) NLM program
- Office of Naval Research [N00014-18-1-2371]
The study explores the non-reciprocal energy transfer phenomenon caused by quantum vacuum fluctuations, demonstrating strong coupling between two micromechanical oscillators through modulation of Casimir interaction parameters, leading to non-reciprocal energy transfer.
One of the fundamental predictions of quantum mechanics is the occurrence of random fluctuations in a vacuum caused by the zero-point energy. Remarkably, quantum electromagnetic fluctuations can induce a measurable force between neutral objects, known as the Casimir effect(1), and it has been studied both theoretically(2,3) and experimentally(4-9). The Casimir effect can dominate the interaction between microstructures at small separations and is essential for micro- and nanotechnologies(10,11). It has been utilized to realize nonlinear oscillation(12), quantum trapping(13), phonon transfer(14)(,)(15) and dissipation dilution(16). However, a non-reciprocal device based on quantum vacuum fluctuations remains an unexplored frontier. Here we report quantum-vacuum-mediated non-reciprocal energy transfer between two micromechanical oscillators. We parametrically modulate the Casimir interaction to realize a strong coupling between the two oscillators with different resonant frequencies. We engineer the system's spectrum such that it possesses an exceptional point(17-20) in the parameter space and explore the asymmetric topological structure in its vicinity. By dynamically changing the parameters near the exceptional point and utilizing the non-adiabaticity of the process, we achieve non-reciprocal energy transfer between the two oscillators with high contrast. Our work demonstrates a scheme that employs quantum vacuum fluctuations to regulate energy transfer at the nanoscale and may enable functional Casimir devices in the future.
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