Abstract
A single layer of the 1T′ phase of WTe2 provides a rich platform for exotic physical properties such as the nonlinear Hall effect and high-temperature quantum spin Hall transport. Utilizing a continuum model and the diagrammatic method, we calculate the second harmonic conductivity of monolayer 1T′-WTe2 modulated by an external vertical electric field and electron doping. We obtain a finite helicity and Faraday rotation for the second harmonic signal in response to linearly polarized incident light in the presence of time-reversal symmetry. The second harmonic signal's helicity is highly controllable by altering the bias potential and serves as an optical indicator of the nonlinear Hall current. Our study motivates future experimental investigation of the helicity spectroscopy of two-dimensional materials.
| Original language | English |
|---|---|
| Article number | 235132 |
| Journal | Physical Review B |
| Volume | 105 |
| Issue number | 23 |
| DOIs | |
| Publication status | Published - 15 Jun 2022 |
Funding
This work is supported by Nordita and the Swedish Research Council (Grant No. VR 2018-04252). Nordita is partially supported by Nordforsk. We thank G. Soavi for carefully reading the manuscript and his very useful comments.
| Funders | Funder number |
|---|---|
| Vetenskapsrådet | VR 2018-04252 |
| NordForsk |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics