Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Enhanced surface state protection and band gap in the topological insulator PbBi4 Te4 S3. / Sumida, K.; Natsumeda, T.; Miyamoto, K.; Silkin, I. V.; Kuroda, K.; Shirai, K.; Zhu, S.; Taguchi, K.; Arita, M.; Fujii, J.; Varykhalov, A.; Rader, O.; Golyashov, V. A.; Kokh, K. A.; Tereshchenko, O. E.; Chulkov, E. V.; Okuda, T.; Kimura, A.
в: PHYSICAL REVIEW MATERIALS, Том 2, № 10, 104201, 01.10.2018.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Enhanced surface state protection and band gap in the topological insulator PbBi4 Te4 S3
AU - Sumida, K.
AU - Natsumeda, T.
AU - Miyamoto, K.
AU - Silkin, I. V.
AU - Kuroda, K.
AU - Shirai, K.
AU - Zhu, S.
AU - Taguchi, K.
AU - Arita, M.
AU - Fujii, J.
AU - Varykhalov, A.
AU - Rader, O.
AU - Golyashov, V. A.
AU - Kokh, K. A.
AU - Tereshchenko, O. E.
AU - Chulkov, E. V.
AU - Okuda, T.
AU - Kimura, A.
N1 - Publisher Copyright: © 2018 American Physical Society.
PY - 2018/10/1
Y1 - 2018/10/1
N2 - Topological insulators (TIs) with an inverted bulk band and a strong spin-orbit coupling exhibit gapless topological surface states (TSSs) protected by time-reversal symmetry. Helical spin textures driven by spin-momentum locking offer the opportunity to generate spin-polarized currents and therefore TIs are expected to be used for future spintronic applications. For practical applications TIs are urgently required that are operable at room temperature due to a wide bulk band gap as well as a distinct topological surface state that is robust to atmospheric exposure. Here we show two distinguishable TSSs originating from different terminations on PbBi4Te4S3 by using spin- and angle-resolved photoemission spectroscopy. We find that one TSS is persistently observed, while the other becomes invisible upon intentional oxygen exposure. The result signifies the presence of a protected TSS buried under the topmost surface. Our finding paves the way for realizing a topological spintronics device under atmospheric conditions.
AB - Topological insulators (TIs) with an inverted bulk band and a strong spin-orbit coupling exhibit gapless topological surface states (TSSs) protected by time-reversal symmetry. Helical spin textures driven by spin-momentum locking offer the opportunity to generate spin-polarized currents and therefore TIs are expected to be used for future spintronic applications. For practical applications TIs are urgently required that are operable at room temperature due to a wide bulk band gap as well as a distinct topological surface state that is robust to atmospheric exposure. Here we show two distinguishable TSSs originating from different terminations on PbBi4Te4S3 by using spin- and angle-resolved photoemission spectroscopy. We find that one TSS is persistently observed, while the other becomes invisible upon intentional oxygen exposure. The result signifies the presence of a protected TSS buried under the topmost surface. Our finding paves the way for realizing a topological spintronics device under atmospheric conditions.
UR - http://www.scopus.com/inward/record.url?scp=85059837446&partnerID=8YFLogxK
U2 - 10.1103/PhysRevMaterials.2.104201
DO - 10.1103/PhysRevMaterials.2.104201
M3 - Article
AN - SCOPUS:85059837446
VL - 2
JO - Physical Review Materials
JF - Physical Review Materials
SN - 2475-9953
IS - 10
M1 - 104201
ER -
ID: 36282018