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Interaction of sublevels in gated biased semiconductor nanowires
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Interaktion av subband i nanotrådar med pålagd drivspänning (Swedish)
Abstract [en]

Mesoscopic devices, such as nano-wires, are of interest for the next step in creating spintronic devices. With the ability to manipulate electrons and their spin, spintronic devices may be realised. To that end the different effects found in low-dimensional devices must be studied and understood. In this thesis  the influence that lateral spin-orbit coupling (LSOC) has on a nanowire, with asymmetrical confinement potential, is studied. The nanowire is studied through a numerical approach, using the Hartree-Fock method with Dirac interactions to solve the eigenvalue problem of an idealised infinite nanowire. The nanowire has a split-gate that generates the electrostatic asymmetrical confinement potential. It is found that the lateral spin-orbit coupling has little to no effect without any longitudinal effects in the wire, such as source-drain bias. The electrons will spontaneously create spin-rows in the device due to spin polarization. The spin polarization is triggered by using LSOC, numerical noise or from a weak magnetic field.

Abstract [sv]

Mesoskopiska anordningar, som nano-trådar, tros vara ett viktigt steg för att skapa spinnelektronik. För att kunna skapa spinnelektronik behövs kunskap om hur elektroner kan manipuleras. Generellt måste därför existerande fenomen i nanoelektronik studeras. I denna avhandling studeras hur ''lateral spin-orbit koppling'' (LSOC) influerar en nanotråd som har en asymmetrisk potentialbarriär. Hartree-Fock metoden, med Dirac potential för elektron-elektron interaktioner, användes för att beräkna energinivåerna för en idealisk, oändligt lång nanotråd. Nanotråden har en split-gate som alstrar den elektrostatiska, asymmetriska potentialbarriären. "Lateral spin-orbit koppling" visar sig ha minimal effekt då longitudinella effekter, exempelvis spänning, saknas. Elektronerna placerar sig spontant i spinn-rader i tråden vid spontan spinn polarisation. Spinn polarisationen sätts igång av LSOC, numeriska störningar eller från svagt pålagt magnetfält.

Place, publisher, year, edition, pages
2016. , 64 p.
Keyword [en]
nanowire, spintronics, lateral spin-orbit coupling, asymmetrical confinement potential, spin polarization
National Category
Other Physics Topics Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-132380ISRN: LITH-IFM-A-EX—16/3273—SEOAI: oai:DiVA.org:liu-132380DiVA: diva2:1044875
Subject / course
Technical Physics
Supervisors
Examiners
Available from: 2016-11-08 Created: 2016-11-04 Last updated: 2016-11-08Bibliographically approved

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Karlsson, Henrik
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