Semi-Dirac point and its transport properties in two-dimensional deformed hexagonal lattice
| Autor: | Lei Xu, Jun Zhang, Pei-Pei Ye |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Condensed matter physics Dirac (software) Dirac point Uniaxial tension Statistical and Nonlinear Physics 02 engineering and technology Electronic structure 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Stress (mechanics) 0103 physical sciences Hexagonal lattice 010306 general physics 0210 nano-technology |
| Zdroj: | Modern Physics Letters B. 32:1850193 |
| ISSN: | 1793-6640 0217-9849 |
| DOI: | 10.1142/s0217984918501932 |
| Popis: | We investigate the effect of uniaxial tensile stress on the electronic structure and transport properties of hexagonal lattice via a tight-binding approach. We find two Dirac points merging into a single point to generate a semi-Dirac cone as the tensile stress increases. The semi-Dirac cone is anisotropic with linear and parabolic dispersions at distinct directions. For a larger tensile stress, a band gap can be opened which indicates a phase transition from metallic phase to insulator phase. In the presence of magnetic field, the degeneracies of all Landau levels are lifted only partially yielding an unconventional Hall conductance with a step size of [Formula: see text] at each non-equidistant Landau level. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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