New type of magnetoresistance oscillations in antidot superlatices on the Si/Si0.7Ge0.3 heterostructure.

In the present work we have investigated the transport properties in a number of Si/SiGe samples with antidot lattices of different periods. In samples with the lattice periods 700 nm and 850 nm we have observed the conventional low-field commensurability magnetoresistance (MR) peaks consistent with the previous observations in GaAs/AlGaAs and Si/SiGe samples with antidot lattices. However in samples with the lattice period 600 nm a new series of quasiperiodic MR oscillations has been found beyond the last commensurability peak which are supposed to originate from skipping orbits encircling an antidot with a particular number of bounds. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]