Magnetoresistance of a lateral contact to a two-dimensional electron gas

Splitting of the subgap resistance peak in superconductor/two-dimensional electron gas contacts at high magnetic fields

“…We already showed in a previous paper that multiple tunneling attempts due to skipping orbits lead to a strong suppression of the contact resistance. 18 This mechanism can thus be used to explain the drop of R c to zero for voltages U dc above 4 mV. In the following model we suggest that also the splitting of the subgap resistance peak can be explained within this framework.…”

“…The total number of collisions with the boundary and consequently the resulting effective transmission probability increases with magnetic field. 18 This is the reason for the suppression of R N observed with increasing B Ќ in the measurement shown in Fig. 3.…”

“…Here, Ӷ1 is the transmission coefficient for normal incidence. 18 If the energy of the particles in the 2DEG is above the Fermi level, the particles are inelastically scattered by electron-electron scattering as shown by Giuliani and Quinn. 21 In our simulation this mechanism is incorporated by assuming a loss of particles with probability exp͓ϪL e/h /l ee (U dc )͔.…”

Investigation of characteristic scattering lengths in strainedIn0.53Ga0.47AUhlisch1, Appenzeller2, Tietze3 et al. 1998Phys. Rev. BSelf Cite3020View full textAdd to dashboardCite

“…Although mobility in those materials is usually smaller than in Al x Ga 1Ϫx As/GaAs, there is a growing interest in these heterostructures as under certain conditions they do not show a depletion zone at the 2DEG vacuum interface. 13 Especially with respect to hybrid devices consisting of superconductors 14,15 or ferromagnetics 16 in combination with semiconductors, this 2DEG allows the fabrication of nonalloyed Ohmic contacts.…”