Fig. 21
From: Conductance Quantization in Resistive Random Access Memory
E–k relationship for a narrow and b wide constriction, respectively [179]. The solid and dashed lines correspond to the bottom of the longitudinal and transversal subbands, respectively. The shaded regions are the states occupied by electrons. The indices indicate the subband number. A tighter constriction leads to higher energy levels. Reproduced with permission