Quantum electronic transport in lowdimensional semiconductors
(1997) Abstract
 Electronic transport is studied at low temperatures in twodimensional electron gases (2DEGs) and in mesoscopic semiconductor microstructures.
The method of microwavedetection of the Shubnikovde Haas effect for the contactfree characterisation of transport properties of 2DEGs is explored using both magneticfield modulation and lightinduced carrier modulation. The methods are compared to magnetophotoluminescence (PL), cyclotron resonance (CR), optically detected CR, and to standard electrical measurements.
The effect of plasma dry etching of the surface of highmobility 2DEG samples on the properties of the 2DEG is studied. The PL and the transport properties of the 2DEG and the concentration of... (More)  Electronic transport is studied at low temperatures in twodimensional electron gases (2DEGs) and in mesoscopic semiconductor microstructures.
The method of microwavedetection of the Shubnikovde Haas effect for the contactfree characterisation of transport properties of 2DEGs is explored using both magneticfield modulation and lightinduced carrier modulation. The methods are compared to magnetophotoluminescence (PL), cyclotron resonance (CR), optically detected CR, and to standard electrical measurements.
The effect of plasma dry etching of the surface of highmobility 2DEG samples on the properties of the 2DEG is studied. The PL and the transport properties of the 2DEG and the concentration of a paramagnetic surface defect created by the etching are found not to be correlated to each other.
The classical and the quantum mechanical dynamics of electrons in mesoscopic, open, triangular electron billiards is studied. The temperatureaveraged magnetoresistance can, using simulations, be explained by specific, classical electron trajectories, the relative importance of which is shown to depend on their Lyapunov stability. Quantum mechanical calculations reproduce observed conductance fluctuations which can be related to a specific electron orbit. Visualizations of the classical and the quantum mechanical electron density distribution inside the billiard are compared at various magnetic fields
The resistance of quasiballistic wires and of ballistic electron cavities is studied in the nonlinear transport regime. The energy dependence of the phasebreaking rate of nonequilibrium electrons in these structures is determined from the line shape of the suppression of weak localization due to voltage induced electronelectron interaction. The two terminal resistance of electron billiards without symmetry axis perpendicular to the current direction is found to be not symmetric upon current reversal in zero magnetic field. This effect appears to be related to ballistic weak localization inside the billiard. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/record/29555
 author
 Linke, Heiner ^{LU}
 opponent

 Assoc Prof Harmans, C J P M, Delft University of Technology, The Netherlands
 organization
 publishing date
 1997
 type
 Thesis
 publication status
 published
 subject
 keywords
 quantum transport, twodimensional electron gas, contactfree characterisation, ballistic transport, mesoscopic, electron billiard, quantum dot, electronelectron interaction, nonlinear, phase breaking, Halvledarfysik, Fysicumarkivet A:1997:Linke, nonsymmetric conductio, Semiconductory physics, lowdimensional structures
 pages
 166 pages
 publisher
 Solid State Physics, Lund University
 defense location
 HÃ¶rsal B, Fysicum, Lund
 defense date
 19971003 10:15
 external identifiers

 other:ISRN: LUFTD2/(TFFF0046)/1166
 ISBN
 9162826514
 language
 English
 LU publication?
 yes
 id
 36768f3b3e584bd2bd54e4af0bd2dcad (old id 29555)
 date added to LUP
 20070614 14:14:13
 date last changed
 20160919 08:45:15
@phdthesis{36768f3b3e584bd2bd54e4af0bd2dcad, abstract = {Electronic transport is studied at low temperatures in twodimensional electron gases (2DEGs) and in mesoscopic semiconductor microstructures.<br/><br> <br/><br> The method of microwavedetection of the Shubnikovde Haas effect for the contactfree characterisation of transport properties of 2DEGs is explored using both magneticfield modulation and lightinduced carrier modulation. The methods are compared to magnetophotoluminescence (PL), cyclotron resonance (CR), optically detected CR, and to standard electrical measurements.<br/><br> <br/><br> The effect of plasma dry etching of the surface of highmobility 2DEG samples on the properties of the 2DEG is studied. The PL and the transport properties of the 2DEG and the concentration of a paramagnetic surface defect created by the etching are found not to be correlated to each other.<br/><br> <br/><br> The classical and the quantum mechanical dynamics of electrons in mesoscopic, open, triangular electron billiards is studied. The temperatureaveraged magnetoresistance can, using simulations, be explained by specific, classical electron trajectories, the relative importance of which is shown to depend on their Lyapunov stability. Quantum mechanical calculations reproduce observed conductance fluctuations which can be related to a specific electron orbit. Visualizations of the classical and the quantum mechanical electron density distribution inside the billiard are compared at various magnetic fields<br/><br> <br/><br> The resistance of quasiballistic wires and of ballistic electron cavities is studied in the nonlinear transport regime. The energy dependence of the phasebreaking rate of nonequilibrium electrons in these structures is determined from the line shape of the suppression of weak localization due to voltage induced electronelectron interaction. The two terminal resistance of electron billiards without symmetry axis perpendicular to the current direction is found to be not symmetric upon current reversal in zero magnetic field. This effect appears to be related to ballistic weak localization inside the billiard.}, author = {Linke, Heiner}, isbn = {9162826514}, keyword = {quantum transport,twodimensional electron gas,contactfree characterisation,ballistic transport,mesoscopic,electron billiard,quantum dot,electronelectron interaction,nonlinear,phase breaking,Halvledarfysik,Fysicumarkivet A:1997:Linke,nonsymmetric conductio,Semiconductory physics,lowdimensional structures}, language = {eng}, pages = {166}, publisher = {Solid State Physics, Lund University}, school = {Lund University}, title = {Quantum electronic transport in lowdimensional semiconductors}, year = {1997}, }