Optoelectric Response of Two-Dimensional Electron Gas at the LaAlO3/SrTiO3 Interface

Abstract

The two-dimensional electron gas (2DEG) observed at the oxide heterointerface of an unusual combination between two materials is becoming one of the hottest issues in solid-state physics and materials science because of its interesting metal-insulator transition, magnetic effects and superconductivity. One of the most fascinating aspects in this system is the ability to tune the electrical properties by external electrical fields, polar adsorbates and electromagnetic waves, i.e., light. Recent studies reported that 2DEG at the oxide interface can be used as a useful tool for novel photonic nanodevices. Reports on optical devices based on a strong polar field from the LaAlO3/SrTiO3 system have highlighted their ability to enhance the photoelectric response in complex oxides for all-oxide optical devices, such as photo detectors and photovoltaics. This article assesses the prospects of optoelectric devices using oxide 2DEG.