A simple one dimensional model of a semiconductor free surface, consisting of a linear barrier of width l connecting the semiconductor to the vacuum level, is used to explore the effect of a non-abrupt potential on the number and nature of surface states. As l varies, Shockley's theorem soon ceases to hold, and for l>3.3 AA a second state appears. Some comments are advanced on the three dimensional case.
No takes yet. Share an insight, caveat, or question.
Flóres et al. (1972) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: