Search for dissertations about: "resistance quantum"

Showing result 1 - 5 of 60 swedish dissertations containing the words resistance quantum.

2. 1. Quantum electronic transport in low-dimensional semiconductors

   Author : Heiner Linke; Fasta tillståndets fysik; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; quantum transport; two-dimensional electron gas; contact-free characterisation; ballistic transport; mesoscopic; electron billiard; quantum dot; electron-electron interaction; non-linear; phase breaking; Halvledarfysik; Fysicumarkivet A:1997:Linke; non-symmetric conductio; Semiconductory physics; low-dimensional structures;

   Abstract : Electronic transport is studied at low temperatures in two-dimensional electron gases (2DEGs) and in mesoscopic semiconductor microstructures. The method of microwave-detection of the Shubnikov-de Haas effect for the contact-free characterisation of transport properties of 2DEGs is explored using both magnetic-field modulation and light-induced carrier modulation. READ MORE

4. 2. Epitaxial Graphene Technology for Quantum Metrology

   Author : Thomas Yager; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; charge neutrality; optical microscopy; Epitaxial graphene; resistance metrology; silicon carbide; quantum Hall effect; electron transport; bilayer graphene;

   Abstract : Graphene grown on silicon carbide by high-temperature annealing (SiC/G) is a strong contender in the race towards large-scale graphene electronics applications. The unique electronic properties of this system lead to a remarkably robust and accurate Hall resistance quantisation of 0. READ MORE

5. 3. Quantum Hall devices on epitaxial graphene: towards large-scale integration

   Author : Arseniy Lartsev; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; quantum Hall effect; resistance metrology; epitaxial graphene; quantum Hall array; magnetotransport;

   Abstract : Quantum Hall devices have been used as the primary standard of electrical resistance for over two decades, and they are unlikely to be replaced in this role any time soon. The work presented in this thesis was being done towards the goal of establishing epitaxial graphene on silicon carbide as a new material of choice for these devices. READ MORE

6. 4. Engineering Epitaxial Graphene for Quantum Metrology

   Author : Hans He; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Epitaxial Graphene; Magnetotransport; Quantum Resistance Metrology; Chemical Doping;

   Abstract : Quantum resistance metrology deals both with the precise and accurate measurement of electrical resistance, by utilizing the quantum hall effect (QHE) in two-dimensional electron gases (2DEGs) such as those based on gallium arsenide (GaAs). Due to the unique properties of graphene, and specifically epitaxial graphene grown on silicon carbide (SiC/G), quantum Hall resistance (QHR) standards based on graphene perform better in a wider parameter space (temperature, current and magnetic field) than conventional semiconducting materials. READ MORE

7. 5. InGaAs Nanowire and Quantum Well Devices

   Author : Lasse Södergren; NanoLund: Centre for Nanoscience; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nanowire; quantum well; cryogenic; III-V; InGaAs; MOSFET; MOVPE; Hall; mobility; ballistic; RF;

   Abstract : To fulfill the increasing demand for high-speed electronics used for computation or communication is one everlasting challenge for the semiconductor industry. Emerging fields such as quantum computation also has a need for circuits operating at cryogenic temperatures. READ MORE