Fig. 1 (IMAGE) Science China Press Caption Simulated harmonic spectra of monolayer AlN in a laser field with the peak intensity of 1.0×1012 W/cm2, wavelength of 1600 nm and pulse duration of 5 optical cycles. Credit ©Science China Press Usage Restrictions Use with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.