scholarly journals Scanning tunneling spectroscopy of a dilute two-dimensional electron system exhibiting Rashba spin splitting

2010 ◽  
Vol 81 (15) ◽  
Author(s):  
S. Becker ◽  
M. Liebmann ◽  
T. Mashoff ◽  
M. Pratzer ◽  
M. Morgenstern
Keyword(s):  
Electron System ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Spin Splitting ◽  
Scanning Tunneling ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Rashba Spin ◽  
Rashba Spin Splitting ◽  
Dimensional Electron System

PROBING THE LOCAL DENSITY OF STATES OF DILUTE ELECTRON SYSTEMS IN DIFFERENT DIMENSIONS

2003 ◽  
Vol 10 (06) ◽  
pp. 933-962 ◽  
Author(s):  
MARKUS MORGENSTERN
Keyword(s):  
Density Of States ◽  
Local Density ◽  
Electron System ◽  
Scanning Tunneling Spectroscopy ◽  
Spin Splitting ◽  
Scanning Tunneling ◽  
Electron Systems ◽  
Local Density Of States ◽  
Dimensional Electron ◽  
Dimensional Electron System

Scanning tunneling spectroscopy at T = 6 K is used to investigate the local density of states (LDOS) of electron systems belonging to the bulk conduction band of InAs. In particular, the three-dimensional electron system (3DES) of the n-doped material, an adsorbate-induced two-dimensional electron system (2DES) and the tip-induced quantum dot (0DES) are investigated at B = 0 T and B = 6 T. It is found that the 3DES at B = 0 T can be described by Bloch states weakly interacting with the potential disorder provided by ionized dopants. The 2DES at B = 0 T exhibits much stronger LDOS corrugations, stressing the tendency for weak localization in the potential disorder. In a magnetic field, 3DES and 2DES show drift states, which are expected in 2D, but are surprising in 3D, where they point to a new electron phase consisting of droplets of quasi-2D systems. The 0DES at B = 0 T reveals quantized states in accordance with Hartree calculations. At B = 6 T it exhibits Landau states with exchange enhanced spin splitting. These states are used to investigate the influence of potential disorder on the exchange enhancement, which visualizes the nonlocality of the exchange interaction.

SPIN SPLITTING IN A TWO DIMENSIONAL ELECTRON SYSTEM DETERMINED BY NUCLEAR MAGNETIC RELAXATION AND MAGNETOTRANSPORT ACTIVATION MEASUREMENTS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 474-479 ◽  
Author(s):  
A. BERG ◽  
D. WEISS ◽  
K. V. KLITZING ◽  
R. NÖTZEL
Keyword(s):  
Energy Transport ◽  
Lattice Relaxation ◽  
Electron System ◽  
Spin Lattice Relaxation ◽  
Spin Splitting ◽  
Electron Interaction ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Spin Lattice ◽  
Dimensional Electron System

The spin splitting observed in two-dimensional electron systems at high magnetic fields is not only determined by the single-electron Zeeman energy but also by many-particle effects. Electron-electron interaction results in an enhanced g-factor which can be described by the exchange part of the Coulomb interaction. Nuclear spin lattice relaxation experiments analysing the Overhauser Shift in Electron Spin Resonance (ESR) measurements reveal that the exchange term is dominant. The spin splitting is strongly dependent on magnetic field and temperature. Numerical simulations enable the quantitative determination of the exchange part of the spin split energy. Transport activation measurements verify that the exchange part is proportional to the spin polarization of the electrons.

Low Density Two-Dimensional Electron Systems Studied by Scanning Tunneling Spectroscopy

2003 ◽  
Vol 42 (Part 1, No. 7B) ◽  
pp. 4809-4815 ◽  
Author(s):  
Markus Morgenstern ◽  
Jan Klijn ◽  
Christian Meyer ◽  
Mathias Getzlaff ◽  
Robert L. Johnson ◽  
...  
Keyword(s):  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Low Density ◽  
Two Dimensional ◽  
Electron Systems ◽  
Dimensional Electron ◽  
Two Dimensional Electron Systems

Rashba spin splitting and cyclotron resonance in strained InGaAs/InP heterostructures with a two-dimensional electron gas

2013 ◽  
Vol 47 (11) ◽  
pp. 1485-1491 ◽  
Author(s):  
K. P. Kalinin ◽  
S. S. Krishtopenko ◽  
K. V. Maremyanin ◽  
K. E. Spirin ◽  
V. I. Gavrilenko ◽  
...  
Keyword(s):  
Cyclotron Resonance ◽  
Electron Gas ◽  
Spin Splitting ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Rashba Spin ◽  
Rashba Spin Splitting ◽  
Dimensional Electron Gas
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