Journal
2D MATERIALS
Volume 8, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/abbc60
Keywords
polymorphism; transition-metal chalcogenides; two-dimensional materials; MBE; STM
Categories
Funding
- Research Grant Council (RGC), Hong Kong Special Administrative Region (HKSAR) [C7036-17W]
- NSFC/RGC joint research grant from the RGC, HKSAR [N_HKU732/17, 51761165024]
- National Natural Science Foundation of China [51761165024, 51772265, 61721005]
- National Basic Research Program of China [2015CB921004]
- Zhejiang Provincial Natural Science Foundation [D19E020002]
- 111 project [B16042]
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Single-layer transition-metal chalcogenides are an important family of two-dimensional materials that can exist in different crystal structures and exhibit diverse physical properties. This study reports a new polymorph of SL-TMC and highlights the importance of electron interactions in the density-of-states at the Fermi level.
Single-layer (SL) transition-metal chalcogenides (TMCs) represent an important family of two-dimensional (2D) materials that have attracted intensive research attention recently. It has been established that many TMCs are polymorphic that can exist in different crystal structures and correspondingly exhibit diverse physical properties. Discovery of new structural phases of a crystal is of great scientific and practical importance. In this work, we report a new polymorph of SL-TMC, i.e. SL-Mo5Te8, attained by molecular-beam epitaxy (MBE). Like the 1H-MoTe2, it possesses the hexagonal symmetry but a much larger unit cell with a basis containing as many as 39 atoms (15 Mo and 24 Te). We call it the variational hexagonal (v1H) phase. Coincidently, it may be viewed also as one containing the highest density possible of mirror-twin domain boundaries (MTBs) in an otherwise pristine 1H-MoTe2. Electronically, it is metallic and a comparison between theory and experiments of its density-of-states (DOS) at the Fermi level reveals features pointing to an importance of electron interactions that invites further investigations.
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