Matches in SemOpenAlex for { <https://semopenalex.org/work/W3003106729> ?p ?o ?g. }
Showing items 1 to 59 of
59
with 100 items per page.
- W3003106729 abstract "Strained Ge modulation doped quantum well (MODQW) heterostructures facilitate a high mobility channel layer. Spatial separation of mobile carriers from the ionised dopants that supply them is key to increasing mobilities many orders of magnitude above bulk values.Materials characterisation techniques are employed to asses and improve the buffer layers within the MODQW heterostructures. The efficacy of dislocation filter layers (DFLs) is investigated, along with annealing trials and suspended structures. A 4% enhancement in SiGe relaxation is reported utilising a Ge DFL, while optimum SiGe relaxation is obtained through balancing the opposing thermal and lattice mismatch within the Gebuff layer.Reverse linearly graded buffers demonstrate a grading rate of 350% μm-1, while achieving a 4 nm RMS roughness. This represents an order of magnitude improvement on the quoted limits of forward linear grading rates. Suspended microwires are presented, providing isolation of channel layers from buffer layers. Strain mapping, using Micro-XRD at the Diamond Light Source, is employed to record strain development during microwire fabrication, resulting in a 0.9% increase in out of plane tensile strain upon suspension. The 150 × 15 μm microwires represent the first demonstration of suspending a Ge QW heterostructure.Low temperature (300 mK), high magnetic field (37.5 T) Hall and resistivity measurements return the effective mass and mobility of composite fermions (CFs) within a 2DHG, along with well-developed FQHE oscillations. CF mobility is shown to contain greater thermal sensitivity compared to its bare electron counterpart. Fractional filling ν = 4/11 is of great interest for its unknown origins and non-Abelian statistics, a potential observation is presented using a differentiated Hall signal. Inverted doping geometry returns the highest Ge MODQW room temperature mobility of 4,900 cm2V-1s-1, assisted by a new contact process comprising Ar milling and Al/Ti/Au deposition, ideal for inverted structures." @default.
- W3003106729 created "2020-01-30" @default.
- W3003106729 creator A5067584117 @default.
- W3003106729 date "2018-09-01" @default.
- W3003106729 modified "2023-10-16" @default.
- W3003106729 title "Fractional quantum phenomena of 2DHGs within strained germanium quantum well heterostructures" @default.
- W3003106729 hasPublicationYear "2018" @default.
- W3003106729 type Work @default.
- W3003106729 sameAs 3003106729 @default.
- W3003106729 citedByCount "0" @default.
- W3003106729 crossrefType "dissertation" @default.
- W3003106729 hasAuthorship W3003106729A5067584117 @default.
- W3003106729 hasConcept C106782819 @default.
- W3003106729 hasConcept C121332964 @default.
- W3003106729 hasConcept C179764930 @default.
- W3003106729 hasConcept C192562407 @default.
- W3003106729 hasConcept C26873012 @default.
- W3003106729 hasConcept C49040817 @default.
- W3003106729 hasConcept C544956773 @default.
- W3003106729 hasConcept C550623735 @default.
- W3003106729 hasConcept C62520636 @default.
- W3003106729 hasConcept C79794668 @default.
- W3003106729 hasConceptScore W3003106729C106782819 @default.
- W3003106729 hasConceptScore W3003106729C121332964 @default.
- W3003106729 hasConceptScore W3003106729C179764930 @default.
- W3003106729 hasConceptScore W3003106729C192562407 @default.
- W3003106729 hasConceptScore W3003106729C26873012 @default.
- W3003106729 hasConceptScore W3003106729C49040817 @default.
- W3003106729 hasConceptScore W3003106729C544956773 @default.
- W3003106729 hasConceptScore W3003106729C550623735 @default.
- W3003106729 hasConceptScore W3003106729C62520636 @default.
- W3003106729 hasConceptScore W3003106729C79794668 @default.
- W3003106729 hasLocation W30031067291 @default.
- W3003106729 hasOpenAccess W3003106729 @default.
- W3003106729 hasPrimaryLocation W30031067291 @default.
- W3003106729 hasRelatedWork W1491814533 @default.
- W3003106729 hasRelatedWork W1645206682 @default.
- W3003106729 hasRelatedWork W1757526297 @default.
- W3003106729 hasRelatedWork W1988626016 @default.
- W3003106729 hasRelatedWork W2020671496 @default.
- W3003106729 hasRelatedWork W2026361976 @default.
- W3003106729 hasRelatedWork W2048637845 @default.
- W3003106729 hasRelatedWork W2050079422 @default.
- W3003106729 hasRelatedWork W2051725704 @default.
- W3003106729 hasRelatedWork W2052735778 @default.
- W3003106729 hasRelatedWork W2066098984 @default.
- W3003106729 hasRelatedWork W2080238161 @default.
- W3003106729 hasRelatedWork W2092998630 @default.
- W3003106729 hasRelatedWork W2111501511 @default.
- W3003106729 hasRelatedWork W2243548495 @default.
- W3003106729 hasRelatedWork W2621510631 @default.
- W3003106729 hasRelatedWork W2766090842 @default.
- W3003106729 hasRelatedWork W3100021449 @default.
- W3003106729 hasRelatedWork W3102352726 @default.
- W3003106729 hasRelatedWork W1862057467 @default.
- W3003106729 isParatext "false" @default.
- W3003106729 isRetracted "false" @default.
- W3003106729 magId "3003106729" @default.
- W3003106729 workType "dissertation" @default.