Abstract
Transition metal ditellurides(TMTDs)have versatile physical properties,including non-trivial topology,Weyl semimetal states and unique spin texture.Controlled growth of high-quality and large-scale monolayer TMTDs with pre-ferred crystal phases is crucial for their applications.Here,we demonstrate the epitaxial growth of 1T'-MoTe2 on Au(111)and graphitized silicon carbide(Gr/SiC)by molecular beam epitaxy(MBE).We investigate the morphology of the grown 1T'-MoTe2 at the atomic level by scanning tunnelling microscopy(STM)and reveal the corresponding microscopic growth mechanism.It is found that the unique ordered Te structures preferentially deposited on Au(111)regulate the growth of monolayer single crystal 1T'-MoTe2,while the Mo clusters were preferentially deposited on the Gr/SiC substrate,which impedes the ordered growth of monolayer MoTe2.We confirm that the size of single crystal lT'-MoTe2 grown on Au(111)is nearly two orders of magnitude larger than that on Gr/SiC.By scanning tunnelling spectroscopy(STS),we observe that the STS spectrum of the monolayer 1T'-MoTe2 nano-island at the edge is different from that at the interior,which exhibits enhanced conductivity.
基金项目
国家重点研发计划(2022YFA1204302)
国家自然科学基金(52022029)
国家自然科学基金(52221001)
国家自然科学基金(92263107)
国家自然科学基金(U23A20570)
国家自然科学基金(62090035)
国家自然科学基金(U19A2090)
国家自然科学基金(12174098)
湖南省自然科学基金(2022JJ30142)
湖南省自然科学基金(2019XK2001)
State Key Laboratory of Powder Metallurgy,Central South University()
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