Band structure of (formula presented) (formula presented) and (formula presented) Angle-resolved photoelectron spectroscopy and ab initio calculations

Physical Review B - Condensed Matter and Materials Physics

Volumn 64, Issue 23, 2001, Pages

  Böker, Th ^a   Severin, R ^a   Muller A ^a   Janowitz, C ^a   Manzke, R ^a   Voss D ^b   Kruger P ^b   Mazur, A ^b   Pollmann, J ^b  

^a HUMBOLDT UNIVERSITY   (Germany)

^b UNIVERSITY OF MÜNSTER   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 84883124695     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.64.235305     Document Type: Article

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38. Just below (formula presented) a rather dispersionless emission feature is observed for all three compounds from (formula presented) to about halfway to K. For (formula presented) an equivalent, rather dispersionless state was reported (Ref. 10) and discussed in the context of a vibronic polaron similar to the electronic polaron claimed for (formula presented) (Ref. 39). Recent studies (Ref. 40) on (formula presented) disprove the electronic polaron concept so that also in the case of similar layered transition metal dichalcogenides other explanations may be more plausible. The respective peak in the (formula presented) series might be nondispersive simply due to a weak overlap with other mainly chalcogen derived orbitals in the direction close to the z-axis. With increasing off-normal emission angles (formula presented), i.e., reaching the Brillouin zone edge, the small overlap with the chalcogen (formula presented) orbitals gives rise to the observed dispersion.
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