Please use this identifier to cite or link to this item: http://hdl.handle.net/10603/426344
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dc.date.accessioned2022-12-17T09:49:33Z-
dc.date.available2022-12-17T09:49:33Z-
dc.identifier.urihttp://hdl.handle.net/10603/426344-
dc.description.abstractLayered transition metal dichalcogenides (TMDCs) host a variety of strongly bound exciton complexes that control the optical properties in these materials. Apart from spin and valley, layer index provides an additional degree of freedom in a few-layer-thick lm. While in the 1H monolayer TMD inversion symmetry is broken, and the reflection symmetry is maintained but, in the bilayer, it is reversed. Trions are excitonic species with a positive or negative charge, and thus, unlike neutral excitons, the flow of trions can generate a net detectable charge current. Trions under favourable doping conditions can be created in a coherent manner using resonant excitation. The neutral biexciton (bound state of two excitons) can assemble further to create a charged state with another electron or hole. Generally, in W-based TMDs these ve-particle quinton states dominate the population density and this can also be engineered to produce photocurrent at cryogenic temperature. In the firrst work, we show that in a few-layer TMDC lm, the wave functions of the conduction and valence-band-edge states contributing to the K(K0) valley are spatially con ned in the alternate layers - giving rise to direct (quasi-)intralayer bright exciton and lower-energy interlayer dark excitons. Depending on the spin and valley con figuration, the bright-exciton state is further found to be a coherent superposition of two layer- induced states, one (E type) distributed in the even layers and the other (O type) in the odd layers. The intralayer nature of the bright exciton manifests as a relatively weak dependence of the exciton binding energy on the thickness of the few-layer lm, and the binding energy is maintained up to 50 meV in the bulk limit - which is an order of magnitude higher than conventional semiconductors...-
dc.format.extentxxvi, 149-
dc.languageEnglish-
dc.rightsuniversity-
dc.titleTailoring excitonic complexes in layered materials-
dc.creator.researcherDas, Sarthak-
dc.subject.keywordEngineering-
dc.subject.keywordEngineering and Technology-
dc.subject.keywordEngineering Multidisciplinary-
dc.subject.keywordPhotocurrent spectroscopy-
dc.contributor.guideMajumdar, Kausik-
dc.publisher.placeBangalore-
dc.publisher.universityIndian Institute of Science Bangalore-
dc.publisher.institutionElectrical Communication Engineering-
dc.date.completed2021-
dc.date.awarded2022-
dc.format.dimensions30 cm-
dc.format.accompanyingmaterialNone-
dc.source.universityUniversity-
dc.type.degreePh.D.-
Appears in Departments:Electrical Communication Engineering

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01_title.pdfAttached File269.64 kBAdobe PDFView/Open
02_prelim pages.pdf509.95 kBAdobe PDFView/Open
03_contents.pdf107.76 kBAdobe PDFView/Open
04_abstract.pdf110.86 kBAdobe PDFView/Open
05_chapter 1.pdf145.57 kBAdobe PDFView/Open
06_chapter 2.pdf1.67 MBAdobe PDFView/Open
07_chapter 3.pdf1.22 MBAdobe PDFView/Open
08_chapter 4.pdf1.67 MBAdobe PDFView/Open
09_chapter 5.pdf1.26 MBAdobe PDFView/Open
10_chapter 6.pdf844.33 kBAdobe PDFView/Open
11_chapter 7.pdf78.09 kBAdobe PDFView/Open
12_annexure.pdf2.46 MBAdobe PDFView/Open
80_recommendation.pdf346.16 kBAdobe PDFView/Open


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