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Second harmonic helicity and Faraday rotation in gated single-layer 1T ' -WTe2
NORDITA, SU; Stockholm Univ, Hannes Alfvens vag 12, S-11421 Stockholm, Sweden..
2022 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 105, no 23, article id 235132Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
American Physical Society , 2022. Vol. 105, no 23, article id 235132
National Category
Atom and Molecular Physics and Optics Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-315818DOI: 10.1103/PhysRevB.105.235132ISI: 000823048000006Scopus ID: 2-s2.0-85133682458OAI: oai:DiVA.org:kth-315818DiVA, id: diva2:1684091
Note

QC 20220721

Available from: 2022-07-21 Created: 2022-07-21 Last updated: 2022-07-21Bibliographically approved

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