Sponsor:
J. C. acknowledges the support from the European Research Council (ERC) through the Starting Grant No. 714577 PHONOMETA and from the MINECO through a Ramón y Cajal grant (Grant No. RYC-2015-17156). This work was supported by the National Basic
Research Program of China (Grant No. 2015CB755500); National Natural Science Foundation of China (Grants No. 11774275, No. 11674250, No. 11534013, and
11547310); Natural Science Foundation of Hubei Province (Grant No. 2017CFA042).
Project:
info:eu-repo/grantAgreement/EC/H2020/714577 Gobierno de España. RYC-2015-17156
The valley can serve as a new degree of freedom in the manipulation of particles or waves in condensed matter physics, whereas systems containing combinations of gain and loss elements constitute rich building units that can mimic non-Hermitian properties. By The valley can serve as a new degree of freedom in the manipulation of particles or waves in condensed matter physics, whereas systems containing combinations of gain and loss elements constitute rich building units that can mimic non-Hermitian properties. By introducing gain and loss in artificial acoustic boron nitride, we show that the acoustic valley states and the valley-projected edge states display exotic behaviors in that they sustain either attenuated or amplified wave propagation. Our findings show how non-Hermiticity introduces a mechanism in tuning topological protected valley transports, which may have significance in advanced wave control for sensing and communication applications.[+][-]