Elemental Topological Dirac Semimetal: α-Sn on InSb(111)

Title
Elemental Topological Dirac Semimetal: α-Sn on InSb(111)
Authors
류혜진Cai-Zhi XuYang-Hao ChanYige ChenPeng ChenXiaoxiong WangCatherine DejoieMan-Hong WongJoseph Andrew HlevyackHae-Young KeeNobumichi TamuraMei-Yin ChouZahid HussainSung-Kwan MoTai-Chang Chiang
Issue Date
2017-04
Publisher
Physical review letters
Citation
VOL 118-146402-5
Abstract
Three-dimensional (3D) topological Dirac semimetals (TDSs) are rare but important as a versatile platform for exploring exotic electronic properties and topological phase transitions. A quintessential feature of TDSs is 3D Dirac fermions associated with bulk electronic states near the Fermi level. Using angle-resolved photoemission spectroscopy, we have observed such bulk Dirac cones in epitaxially grown alpha--Sn films on InSb(111), the first such TDS system realized in an elemental form. First-principles calculations confirm that epitaxial strain is key to the formation of the TDS phase. A phase diagram is established that connects the 3D TDS phase through a singular point of a zero-gap semimetal phase to a topological insulator phase. The nature of the Dirac cone crosses over from 3D to 2D as the film thickness is reduced.
URI
http://pubs.kist.re.kr/handle/201004/70274
ISSN
0031-9007
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KIST Publication > Article
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