Essays about: "tight-binding"

Showing result 11 - 15 of 27 essays containing the word tight-binding.

  1. 11. Simulating the effect of structural imperfections on nanowire transport properties using kwant

    University essay from Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Author : Alexandros Pallaris; [2021]
    Keywords : nanowire; conductance; imperfection; electron transport; quantum transport; tight-binding model; Technology and Engineering;

    Abstract : Conductance was calculated for trapezoidal nanowires with different forms and strengths of imperfection using kwant, a quantum transport software package that uses a tight-binding model. In this thesis it is found that increasing magnitudes of different imperfections such as surface charge and roughness roughen conductance steps, introduce resonances, and lower conductance overall with different character of these effects for different types of imperfections. READ MORE

  3. 12. Electronic states in semiconductor double quantum dots and quantum rings - Theory and tight-binding modeling

    University essay from Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen

    Author : Calle Stenberg; [2021]
    Keywords : double quantum dots quantum rings tight-binding aharonov-bohm g-factor enhancement InAs; Physics and Astronomy;

    Abstract : In recent experiments on semiconductor nanowires and quantum dots, enhanced g-factors up to several times the bulk value have been measured [1] [2]. The enhancement is attributed to orbital contributions g∗orb to the effective g-factor g∗ = g∗spin+g∗orb from the coupling of the high angular momentum ring-like states to the magnetic field. READ MORE

  4. 13. Exploring Spin-Transport in Graphene

    University essay from Uppsala universitet/Energimaterialens fysik

    Author : Giacomo Luani; [2021]
    Keywords : ;

    Abstract : Graphene is one of the most popular new materials both in the academic and private sectors. Its striking properties allow for radical redesigns of many electronic or storage devices. In this report, first, a brief theoretical description of graphene’s band structure is given using the tight/binding method, along with its unique properties. READ MORE

  5. 14. Extended tight binding studies of theinitial reaction between ethylenecarbonate and lithium

    University essay from Uppsala universitet/Institutionen för kemi - BMC; Uppsala universitet/Institutionen för kemi - Ångström

    Author : Johan Erkers; [2020]
    Keywords : ;

    Abstract : .... READ MORE

  6. 15. Band structures of topological crystalline insulators

    University essay from Karlstads universitet/Institutionen för ingenjörsvetenskap och fysik

    Author : Elisabet Edvardsson; [2018]
    Keywords : Topological insulator; Band structure; Block tridiagonal matrix;

    Abstract : Topological insulators and topological crystalline insulators are materials that have a bulk band structure that is gapped, but that also have toplogically protected non-gapped surface states. This implies that the bulk is insulating, but that the material can conduct electricity on some of its surfaces. READ MORE