Transport characteristics of electrons in weak short-period two-dimensional potential arrays

Kawaharazuka, A.; Saku, T.; Tokura, Y.; Horikoshi, Y.; Hirayama, Y.
July 2001
Applied Physics Letters;7/16/2001, Vol. 79 Issue 3
Academic Journal
We study the transport characteristics of electrons in weak short-period two-dimensional potential arrays formed on a back-gated undoped GaAs/AlGaAs heterostructure with a shallow channel. The period of the potential is as short as 50 nm. We achieve the condition where the unit cell is filled by less than one electron. In addition to the conventional magnetoresistance characteristics, we have found a feature that is determined solely by electron density. This feature reflects the strong Coulomb interaction between the electrons confined in the potential arrays. © 2001 American Institute of Physics.


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