Matches in SemOpenAlex for { <https://semopenalex.org/work/W2923057731> ?p ?o ?g. }
Showing items 1 to 62 of
62
with 100 items per page.
- W2923057731 abstract "In the field of low dimensional materials, metal-semiconductor structuresare exceptionally appealing due to their intriguing fundamental and extensivetechnological aspects. Two-dimensional metal-semiconductor systems are knownto exhibit various exciting physics including the charge density wave formation,superconducting properties, and strong spin-orbit coupling. Metallic nanowireson semiconductor surfaces are prototypical quasi one-dimensional systems thatundergo a phase transition at low temperatures due to various instabilities inthe system. A profound insight into these interesting physics unravels with theknowledge of the electronic structure. The electron scattering dynamics thatplay a crucial role in device functionality is largely unexplored for the quasilow-dimensional systems. In this study, we aim at understanding the electronicstructure and the electron scattering dynamics in such systems by means offemtosecond time-resolved linear and non-linear photoemission. In the quasi two-dimensional Pb/Si(111), three electronic states were identifiedwhose unoccupied nature was verified from the temporal evolution oftheir population dynamics. These unoccupied states exhibited asymmetricphotoemission intensity distribution and electronic dispersion across Γ (kІІ=0).These asymmetries have been found to be a consequence of various processesincluding the off-normal light incidence, involvement of bulk states, final stateseffects, and spin-effects. Investigation of the unoccupied electronic structure of quasi-one-dimensionalreconstructions of Pb atoms on a Si(557) surface identified two states. Densityfunctional theory calculations revealed their presence in an energy regiondegenerate with a reduced electronic density of states of the Si substrate resultingin rather high momentum-averaged lifetimes. It was further identified thatthe photoemission yield and the population dynamics depend on the electronmomentum component perpendicular to the steps of the Si substrate. Weconclude that momentum- and direction-dependent dephasing caused by elasticscattering at the step edges, modifies the excited-state population dynamics inthis system. In addition, the electron dynamics found to exhibit no signatureof the phase transition reported earlier for this system. For the In/Si(111) system, the structural phase transition results in modificationof the occupied electronic structure at the BZ center (k=0) and boundary along the wire direction. Optically excited carriers revealed a lifetime of approximately 500fs. This confirms that the excited carriers survive on a timescale at which a structural transition occurs." @default.
- W2923057731 created "2019-04-01" @default.
- W2923057731 creator A5007798172 @default.
- W2923057731 date "2018-01-01" @default.
- W2923057731 modified "2023-09-23" @default.
- W2923057731 title "Unoccupied electronic structure and ultrafast dynamics in quasi low-dimensional systems" @default.
- W2923057731 doi "https://doi.org/10.17185/duepublico/70042" @default.
- W2923057731 hasPublicationYear "2018" @default.
- W2923057731 type Work @default.
- W2923057731 sameAs 2923057731 @default.
- W2923057731 citedByCount "0" @default.
- W2923057731 crossrefType "dissertation" @default.
- W2923057731 hasAuthorship W2923057731A5007798172 @default.
- W2923057731 hasConcept C108225325 @default.
- W2923057731 hasConcept C121332964 @default.
- W2923057731 hasConcept C147120987 @default.
- W2923057731 hasConcept C159467904 @default.
- W2923057731 hasConcept C167735695 @default.
- W2923057731 hasConcept C191486275 @default.
- W2923057731 hasConcept C192562407 @default.
- W2923057731 hasConcept C26873012 @default.
- W2923057731 hasConcept C520434653 @default.
- W2923057731 hasConcept C62520636 @default.
- W2923057731 hasConcept C86025842 @default.
- W2923057731 hasConceptScore W2923057731C108225325 @default.
- W2923057731 hasConceptScore W2923057731C121332964 @default.
- W2923057731 hasConceptScore W2923057731C147120987 @default.
- W2923057731 hasConceptScore W2923057731C159467904 @default.
- W2923057731 hasConceptScore W2923057731C167735695 @default.
- W2923057731 hasConceptScore W2923057731C191486275 @default.
- W2923057731 hasConceptScore W2923057731C192562407 @default.
- W2923057731 hasConceptScore W2923057731C26873012 @default.
- W2923057731 hasConceptScore W2923057731C520434653 @default.
- W2923057731 hasConceptScore W2923057731C62520636 @default.
- W2923057731 hasConceptScore W2923057731C86025842 @default.
- W2923057731 hasLocation W29230577311 @default.
- W2923057731 hasOpenAccess W2923057731 @default.
- W2923057731 hasPrimaryLocation W29230577311 @default.
- W2923057731 hasRelatedWork W1520325571 @default.
- W2923057731 hasRelatedWork W2028087810 @default.
- W2923057731 hasRelatedWork W2073566360 @default.
- W2923057731 hasRelatedWork W2090221841 @default.
- W2923057731 hasRelatedWork W2245351748 @default.
- W2923057731 hasRelatedWork W2330456155 @default.
- W2923057731 hasRelatedWork W2582202510 @default.
- W2923057731 hasRelatedWork W2598054525 @default.
- W2923057731 hasRelatedWork W2888121649 @default.
- W2923057731 hasRelatedWork W2936037325 @default.
- W2923057731 hasRelatedWork W2980908769 @default.
- W2923057731 hasRelatedWork W2984301712 @default.
- W2923057731 hasRelatedWork W3005988349 @default.
- W2923057731 hasRelatedWork W3011065089 @default.
- W2923057731 hasRelatedWork W3082677665 @default.
- W2923057731 hasRelatedWork W3103633956 @default.
- W2923057731 hasRelatedWork W3155010099 @default.
- W2923057731 hasRelatedWork W3159863743 @default.
- W2923057731 hasRelatedWork W3167348229 @default.
- W2923057731 hasRelatedWork W52939374 @default.
- W2923057731 isParatext "false" @default.
- W2923057731 isRetracted "false" @default.
- W2923057731 magId "2923057731" @default.
- W2923057731 workType "dissertation" @default.