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Second harmonic hel...
Second harmonic helicity and Faraday rotation in gated single-layer 1T ' -WTe2
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- Bhalla, Pankaj (author)
- Stockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),NORDITA, SU; Stockholm Univ, Hannes Alfvens vag 12, S-11421 Stockholm, Sweden.
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- Rostami, Habib (author)
- Stockholms universitet,Nordiska institutet för teoretisk fysik (Nordita)
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(creator_code:org_t)
- American Physical Society, 2022
- 2022
- English.
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In: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 105:23
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https://doi.org/10.1...
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Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- ref (subject category)
- art (subject category)
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