Magnetic-field-induced suppression of tunnelling into a two-dimensional electron system

T. Reker, Y. C. Chung, H. Im, P. C. Klipstein, R. J. Nicholas, Hadas Shtrikman

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Abstract

Tunnelling between a three-dimensional emitter contact and a two-dimensional electron system (2DES) is studied in magnetic fields aligned perpendicular to the barriers of a double-barrier heterostructure. The differential conductance around the Fermi energy exhibits a magnetic-field-dependent pseudogap. This pseudogap is shown to be thermally activated and to depend on the two-dimensional electron density. We attribute this pseudogap to an extra energy that an electron tunnelling from the emitter into the 2DES has to overcome as a result of the correlated state of the 2DES.

Original languageEnglish
Article number309
Pages (from-to)5561-5574
Number of pages14
JournalJournal of Physics Condensed Matter
Volume14
Issue number22
DOIs
StatePublished - 10 Jun 2002
Externally publishedYes

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