Anisotropic sub-band splitting mechanisms in strained HgTe: a first principles study
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866914603273814016 |
|---|---|
| author | Ketkar, Eeshan Marini, Giovanni Forcella, Pietro Maria Sangiovanni, Giorgio Profeta, Gianni Beugeling, Wouter |
| author_facet | Ketkar, Eeshan Marini, Giovanni Forcella, Pietro Maria Sangiovanni, Giorgio Profeta, Gianni Beugeling, Wouter |
| contents | Mercury telluride is a canonical material for realizing topological phases, yet a full understanding of its electronic structure remains challenging due to subtle competing effects. Using first-principles calculations and $\mathbf{k}\cdot\mathbf{p}$ modelling, we study its topological phase diagram under strain. We show that linearly $k$-dependent higher-order $C_4$ strain terms are important for capturing the correct low-energy behaviour. These terms lead to a nontrivial $k$-dependence of the sub-band splitting arising from the interplay of strain and bulk inversion asymmetry. This explains the camel-back feature in the tensile regime and supports the emergence of a Weyl semimetal phase under compressive strain. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_13042 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Anisotropic sub-band splitting mechanisms in strained HgTe: a first principles study Ketkar, Eeshan Marini, Giovanni Forcella, Pietro Maria Sangiovanni, Giorgio Profeta, Gianni Beugeling, Wouter Materials Science Mesoscale and Nanoscale Physics Mercury telluride is a canonical material for realizing topological phases, yet a full understanding of its electronic structure remains challenging due to subtle competing effects. Using first-principles calculations and $\mathbf{k}\cdot\mathbf{p}$ modelling, we study its topological phase diagram under strain. We show that linearly $k$-dependent higher-order $C_4$ strain terms are important for capturing the correct low-energy behaviour. These terms lead to a nontrivial $k$-dependence of the sub-band splitting arising from the interplay of strain and bulk inversion asymmetry. This explains the camel-back feature in the tensile regime and supports the emergence of a Weyl semimetal phase under compressive strain. |
| title | Anisotropic sub-band splitting mechanisms in strained HgTe: a first principles study |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2408.13042 |