Universität zu Köln

Nakayama, Kosuke ORCID: 0000-0003-2462-2253, Souma, Seigo, Trang, Chi Xuan, Takane, Daichi, Chen, Chaoyu, Avila, Jose, Takahashi, Takashi, Sasaki, Satoshi, Segawa, Kouji, Carmen Asensio, Maria, Ando, Yoichi ORCID: 0000-0002-3553-3355 and Sato, Takafumi ORCID: 0000-0002-4544-5463 (2019). Nanomosaic of Topological Dirac States on the Surface of Pb5Bi24Se41 Observed by Nano-ARPES. Nano Lett., 19 (6). S. 3737 - 3743. WASHINGTON: AMER CHEMICAL SOC. ISSN 1530-6992

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Abstract

We have performed scanning angle-resolved photoemission spectroscopy with a nanometer-sized beam spot (nano-ARPES) on the cleaved surface of Pb5Bi24Se41, which is a member of the (PbSe)(5)(Bi2Se3)(3m) homologous series (PSBS) with m = 4 consisting of alternate stacking of the topologically trivial insulator PbSe bilayer and four quintuple layers (QLs) of the topological insulator Bi2Se3. This allows us to visualize a mosaic of topological Dirac states at a nanometer scale coming from the variable thickness of the Bi2Se3 nanoislands (1-3 QLs) that remain on top of the PbSe layer after cleaving the PSBS crystal, because the local band structure of topological origin changes drastically with the thickness of the Bi2Se3 nanoislands. A comparison of the local band structure with that in ultrathin Bi2Se3 films on Si(111) gives us further insights into the nature of the observed topological states. This result demonstrates that nano-ARPES is a very useful tool for characterizing topological heterostructures.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Nakayama, Kosuke UNSPECIFIED orcid.org/0000-0003-2462-2253 UNSPECIFIED Souma, Seigo UNSPECIFIED UNSPECIFIED UNSPECIFIED Trang, Chi Xuan UNSPECIFIED UNSPECIFIED UNSPECIFIED Takane, Daichi UNSPECIFIED UNSPECIFIED UNSPECIFIED Chen, Chaoyu UNSPECIFIED UNSPECIFIED UNSPECIFIED Avila, Jose UNSPECIFIED UNSPECIFIED UNSPECIFIED Takahashi, Takashi UNSPECIFIED UNSPECIFIED UNSPECIFIED Sasaki, Satoshi UNSPECIFIED UNSPECIFIED UNSPECIFIED Segawa, Kouji UNSPECIFIED UNSPECIFIED UNSPECIFIED Carmen Asensio, Maria UNSPECIFIED UNSPECIFIED UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED Sato, Takafumi UNSPECIFIED orcid.org/0000-0002-4544-5463 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-146380
DOI:	10.1021/acs.nanolett.9b00875
Journal or Publication Title:	Nano Lett.
Volume:	19
Number:	6
Page Range:	S. 3737 - 3743
Date:	2019
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1530-6992
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CROSSOVER; TRANSPORT Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14638