LOGO (IMAGE) Lancaster University Caption ULTRARAM exploits quantum resonant tunnelling to achieve its extraordinary properties and is implemented in compound semiconductors that are used in photonic devices such as LEDs, laser diodes and infrared detectors, but not in digital electronics, which is the preserve of silicon Credit Lancaster University Usage Restrictions none License Original 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.