Previous Article Next Article Table of Contents Nature Materials, Vol.17, No.3, 215-216, 2018 DOI10.1038/s41563-018-0025-5 Export Citation 2D hole gas seen Chen YZ, Pryds N A p-type metallic sheet forms between two oxide insulators, LaAlO3 and SrTiO3. Suppression of oxygen vacancies in SrTiO3 plays a critical role in forming this sheet. Please enable JavaScript to view the comments powered by Disqus.