Accessing the exceptional points of parity-time symmetric acoustics

Chengzhi Shi, Marc Dubois, Yun Chen, Lei Cheng, Hamidreza Ramezani, Yuan Wang and Xiang Zhang ()
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Chengzhi Shi: NSF Nano-scale Science and Engineering Center (NSEC), University of California, Berkeley
Marc Dubois: NSF Nano-scale Science and Engineering Center (NSEC), University of California, Berkeley
Yun Chen: State Key Laboratory of ASIC and System, Fudan University
Lei Cheng: State Key Laboratory of ASIC and System, Fudan University
Hamidreza Ramezani: NSF Nano-scale Science and Engineering Center (NSEC), University of California, Berkeley
Yuan Wang: NSF Nano-scale Science and Engineering Center (NSEC), University of California, Berkeley
Xiang Zhang: NSF Nano-scale Science and Engineering Center (NSEC), University of California, Berkeley

Nature Communications, 2016, vol. 7, issue 1, 1-5

Abstract: Abstract Parity-time (PT) symmetric systems experience phase transition between PT exact and broken phases at exceptional point. These PT phase transitions contribute significantly to the design of single mode lasers, coherent perfect absorbers, isolators, and diodes. However, such exceptional points are extremely difficult to access in practice because of the dispersive behaviour of most loss and gain materials required in PT symmetric systems. Here we introduce a method to systematically tame these exceptional points and control PT phases. Our experimental demonstration hinges on an active acoustic element that realizes a complex-valued potential and simultaneously controls the multiple interference in the structure. The manipulation of exceptional points offers new routes to broaden applications for PT symmetric physics in acoustics, optics, microwaves and electronics, which are essential for sensing, communication and imaging.

Date: 2016
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DOI: 10.1038/ncomms11110

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