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(a)–(b) SL potential profile and energy levels at low and high electric fields under a magnetic field applied parallel to the SL axis. (c) curves for sample vs . (d) dependence of the intensity of the current peak, , in . (e) dependence of the voltage position, , of the current peak.
(a) Grey-scale plot of the differential conductance vs and at . Diagonal white lines show SCR conditions: , where , 2. The horizontal dotted line shows the MPR condition . Vertical dotted lines represent the optical phonon resonance (OPR) condition , where , 2. The OPR condition corresponds to dissipation of energy through LO phonon emission. (b)–(c) Schematic diagram of the inter-WSL level electron hopping process corresponding to the SCR and MPR conditions.
Normalized inelastic scattering time vs (a) and Δ (b) for all our SLs. (c) Dependence of the ratio on for all our SLs. The continuous line describes a characteristic quenching behavior of the current with increasing , i.e., .
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