Fig. 1
Current-controlled negative differential resistance (NDR). a im–Vext plots from Eqs. (1–2) for two different cases: RS < RNDR and RS > RNDR. Bias current (ibias) and the high and low stable currents (iH and iL) are marked. b dT/dt vs. T for the case of RS < RNDR for an applied voltage of 0.91 V. Temperatures corresponding to ibias, iH and iL are marked (Tbias, TH and TL). c dT/dt vs. T for the case of RS > RNDR for an applied voltage of 0.96 V. d Stable (‘S’) (TH and TL) and unstable (‘U’) (Tbias) temperatures corresponding to the steady-states for different applied Vext. e Same as d for the case of RS > RNDR. f Stable (jH and jL) and unstable (jU) current densities corresponding to the steady-states for different applied Vext. g Same as f for the case of RS > RNDR. h Area fractions (Af) of the two current-density states (x and 1 − x) plotted against Vext for RS < RNDR. i ΔH of the active layer vs. Vext for the unstable (‘U’) and decomposed (‘D’) states for RS < RNDR
