ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We report a study of transport in crossed electric and magnetic (B) fields in a double-barrier tunneling structure with a wide (600 A(ring)) well at T=1.5 K and 0〈B〈23 T. At B=0 we observe 21 resonances, 11 of which correspond to extended-state resonances for biases 〉0.85 V. Under a transverse magnetic field, the bound resonances evolve into magnetoelectric states and are shifted to higher biases. In the low bias range, for high magnetic fields, additional resonances from barrier-bound skipping states are observed. A semiclassical model for ballistic motion in crossed fields is used to determine boundaries between the different trajectory regimes (i.e., traversing, skipping, bulk-like) in the magnetic field-bias voltage space of the resonances. The model shows excellent quantitative agreement with experiment when nonparabolic corrections to the effective mass are included. In addition, the B-induced shift in the transition from bound to extended-state tunneling resonances is explained with this simple description.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.103095
