skip to main content

Title: Tuning the tunneling probability between low-dimensional electron systems by momentum matching

We demonstrate the possibility to tune the tunneling probability between an array of self- assembled quantum dots and a two-dimensional electron gas (2DEG) by changing the energy imbalance between the dot states and the 2DEG. Contrary to the expectation from Fowler-Nordheim tunneling, the tunneling rate decreases with increasing injection energy. This can be explained by an increasing momentum mismatch between the dot states and the Fermi-circle in the 2DEG. Our findings demonstrate momentum matching as a useful mechanism (in addition to energy conservation, density of states, and transmission probability) to electrically control the charge transfer between quantum dots and an electron reservoir.
Authors:
; ; ;  [1] ; ;  [2]
  1. Fakultät für Physik and CENIDE, Universität Duisburg-Essen, Lotharstraße 1, 47048 Duisburg (Germany)
  2. Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum (Germany)
Publication Date:
OSTI Identifier:
22483071
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 24; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DENSITY OF STATES; ELECTRON GAS; ELECTRONS; ENERGY CONSERVATION; PROBABILITY; QUANTUM DOTS; TUNNEL EFFECT; TWO-DIMENSIONAL SYSTEMS