PT - JOURNAL ARTICLE AU - Han, Kun AU - Hu, Kaige AU - Li, Xiao AU - Huang, Ke AU - Huang, Zhen AU - Zeng, Shengwei AU - Qi, Dongchen AU - Ye, Chen AU - Yang, Jian AU - Xu, Huan AU - Ariando, Ariando AU - Yi, Jiabao AU - Lü, Weiming AU - Yan, Shishen AU - Wang, X. Renshaw TI - Erasable and recreatable two-dimensional electron gas at the heterointerface of SrTiO<sub>3</sub> and a water-dissolvable overlayer AID - 10.1126/sciadv.aaw7286 DP - 2019 Aug 01 TA - Science Advances PG - eaaw7286 VI - 5 IP - 8 4099 - http://advances.sciencemag.org/content/5/8/eaaw7286.short 4100 - http://advances.sciencemag.org/content/5/8/eaaw7286.full SO - Sci Adv2019 Aug 01; 5 AB - While benefiting greatly from electronics, our society also faces a major problem of electronic waste, which has already caused environmental pollution and adverse human health effects. Therefore, recyclability becomes a must-have feature in future electronics. Here, we demonstrate an erasable and recreatable two-dimensional electron gas (2DEG), which can be easily created and patterned by depositing a water-dissolvable overlayer of amorphous Sr3Al2O6 (a-SAO) on SrTiO3 (STO) at room temperature. The 2DEG can be repeatedly erased or recreated by depositing the a-SAO or dissolving in water, respectively. Photoluminescence results show that the 2DEG arises from the a-SAO–induced oxygen vacancy. Furthermore, by gradually depleting the 2DEG, a transition of nonlinear to linear Hall effect is observed, demonstrating an unexpected interfacial band structure. The convenience and repeatability in the creation of the water-dissolvable 2DEG with rich physics could potentially contribute to the exploration of next generation electronics, such as environment-friendly or water-soluble electronics.