Sökning: "quantum spin Hall effect"

Hittade 3 uppsatser innehållade orden quantum spin Hall effect.

1. 1. Gap properties of helical edge states in two-dimensional topological insulators with time-dependent magnetic impurities

   Master-uppsats, Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen

   Författare :Simon Wozny; [2020]
   Nyckelord :topological insulators; edge states; impurities; density of states; Green s function; Floquet; Physics and Astronomy;

   Sammanfattning : The quantum mechanical equivalent of the classical Hall effect can lead to interesting results in solid state physics. A similar effect, that has received attention in recent years, occurs when large spin-orbit coupling is present in a material, the so-called quantum-spin Hall effect. LÄS MER

3. 2. From the quantum Hall effect to topological insulators : A theoretical overview of recent fundamental developments in condensed matter physics

   Kandidat-uppsats, Teoretisk fysik

   Författare :Hjalmar Eriksson; [2010]
   Nyckelord :quantum Hall effect; topological insulator; topological insulators; Hall effect; quantum spin Hall effect; kvantiserade Halleffekten; topologisk isolator; topologiska isolatorer; Halleffekten; kvantiserade spin-Halleffekten;

   Sammanfattning : In this overview I describe the simplest models for the quantum Hall and quantum spin Hall effects, and give some general indications as to the description of topological insulators. As a background to the theoretical models I will first trace the development leading up to the description of topological insulators . LÄS MER

4. 3. Exact Diagonalization of Few-electron Quantum Dots

   Kandidat-uppsats, Institutionen för datavetenskap, fysik och matematik, DFM

   Författare :Shirin Hakimi; [2009]
   Nyckelord :two-dimensional quantum dot; strongly correlated system; few-electron system; exact diagonalization; Lanczos method; Landau level; fractional quantum Hall effect; Wigner crystal; Hartree-Fock approximation; Second quantization;

   Sammanfattning : We consider a system of few electrons trapped in a two-dimensional circularquantum dot with harmonic confinement and in the presence of ahomogeneous magnetic field, with focus on the role of e-e interaction. Byperforming the exact diagonalization of the Hamiltonian in second quantization,the low-lying energy levels for spin polarized system are obtained. LÄS MER