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Strain-dependent ex...
Strain-dependent exciton diffusion in transition metal dichalcogenides
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- Rosati, Roberto, 1984 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Brem, Samuel, 1991 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Perea Causin, Raul, 1995 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Schmidt, Robert (author)
- Westfaelische Wilhelms-Universität Münster,University of Münster
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- Niehues, Iris (author)
- Westfaelische Wilhelms-Universität Münster,University of Münster
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- de Vasconcellos, S. M. (author)
- Westfaelische Wilhelms-Universität Münster,University of Münster
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- Bratschitsch, R. (author)
- Westfaelische Wilhelms-Universität Münster,University of Münster
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- Malic, Ermin, 1980 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2020-12-02
- 2021
- English.
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In: 2D Materials. - : IOP Publishing. - 2053-1583. ; 8:1
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Abstract
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- Monolayers of transition metal dichalcogenides have a remarkable excitonic landscape with deeply bound bright and dark exciton states. Their properties are strongly affected by lattice distortions that can be created in a controlled way via strain. Here, we perform a joint theory-experiment study investigating exciton diffusion in strained tungsten disulfide (WS2) monolayers. We reveal a non-trivial and non-monotonic influence of strain. Lattice deformations give rise to different energy shifts for bright and dark excitons changing the excitonic landscape, the efficiency of intervalley scattering channels and the weight of single exciton species to the overall exciton diffusion. We predict a minimal diffusion coefficient in unstrained WS2 followed by a steep speed-up by a factor of 3 for tensile biaxial strain at about 0.6% strain - in excellent agreement with our experiments. The obtained microscopic insights on the impact of strain on exciton diffusion are applicable to a broad class of multi-valley 2D materials.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Teknisk mekanik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Applied Mechanics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- art (subject category)
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- By the author/editor
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Rosati, Roberto, ...
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Brem, Samuel, 19 ...
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Perea Causin, Ra ...
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Schmidt, Robert
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Niehues, Iris
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de Vasconcellos, ...
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show more...
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Bratschitsch, R.
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Malic, Ermin, 19 ...
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show less...
- About the subject
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Mechanical Engin ...
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and Applied Mechanic ...
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Materials Engine ...
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and Other Materials ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
- Articles in the publication
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2D Materials
- By the university
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Chalmers University of Technology