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 language | English |
---|---|
Article number | 309 |
Pages (from-to) | 5561-5574 |
Number of pages | 14 |
Journal | Journal of Physics Condensed Matter |
Volume | 14 |
Issue number | 22 |
DOIs | |
State | Published - 10 Jun 2002 |