upward

GaAs

Ohtake A, Surface reconstructions on GaAs(001), Surf Sci Rep 63, 295 (2008)


Y Chung, K Villegas Rosales, K Baldwin, P Madathil, K West, M Shayegan, L Pfeiffer, Ultra-high-quality two-dimensional electron systems, Nat Mater 20, 632 (2021)

Robertson J, Model of interface states at III-V oxide interfaces, APL 94, 152104 (2009)

V Kolkovsky, K B Nielsen, A N Larsen, L Dobaczewski, Negative-U property of interstitial hydrogen in GaAs, PRB 78, 035211 (2008)