Observation of a highly spin-polarized topological surface state in GeBi<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>Te<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msub></mml:math>

Okamoto, K.; Kuroda, Kenta; Miyahara, H.; Miyamoto, Koji; Okuda, Takashi; Aliev, Ziya S.; Бабанлы, М. Б.; Амирасланов, И. Р.; Shimada, Kenya; Namatame, H.; Takeuchi, Masaki; Samorokov, D. A.; Menshchikova, Tatiana V.; Chulkov, Eugene V.; Kimura, Akio

doi:10.1103/physrevb.86.195304

Cited by 64 publications

(28 citation statements)

References 46 publications

(81 reference statements)

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“…[21][22][23][24] Very recently, GBT was claimed to be a 3D TI based on ARPES measurements, 25 albeit with a Dirac point lying below the Fermi energy ( −0.2 eV). This is in contrast with first principle calculations, 25,26 which place the Dirac point inside the band gap, and a resolution of this point is imperative.…”

Section: Introductionmentioning

confidence: 83%

Topological metal behavior in GeBi2Te4single crystals

et al. 2013

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The metallic character of the GeBi 2 Te 4 single crystals is probed using a combination of structural and physical properties measurements, together with density functional theory (DFT) calculations. The structural study shows distorted Ge coordination polyhedra, mainly of the Ge octahedra. This has a major impact on the band structure, resulting in bulk metallic behavior of GeBi 2 Te 4 , as indicated by DFT calculations. Such calculations place GeBi 2 Te 4 in a class of a few known nontrivial topological metals, and explains why an observed Dirac point lies below the Fermi energy at about −0.12 eV. A topological picture of GeBi 2 Te 4 is confirmed by the observation of surface state modulations by scanning tunneling microscopy.

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Section: Introductionmentioning

confidence: 83%

Topological metal behavior in GeBi2Te4single crystals

et al. 2013

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“…102,119) However, a follow-up work by Okamoto et al showed that GeBi 2 Te 4 is naturally electron doped. 120) The GeBi 2 Te 4 crystals grown in the present author's laboratory are also highly conducting with n-type carriers.…”

Section: Three-dimensional Tismentioning

confidence: 99%

Topological Insulator Materials

2013

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Topological insulators represent a new quantum state of matter which is characterized by peculiar edge or surface states that show up due to a topological character of the bulk wave functions. This review presents a pedagogical account on topological insulator materials with an emphasis on basic theory and materials properties. After presenting a historical perspective and basic theories of topological insulators, it discusses all the topological insulator materials discovered as of May 2013, with some illustrative descriptions of the developments in materials discoveries in which the author was involved. A summary is given for possible ways to confirm the topological nature in a candidate material. Various synthesis techniques as well as the defect chemistry that are important for realizing bulk-insulating samples are discussed. Characteristic properties of topological insulators are discussed with an emphasis on transport properties. In particular, the Dirac fermion physics and the resulting peculiar quantum oscillation patterns are discussed in detail. It is emphasized that proper analyses of quantum oscillations make it possible to unambiguously identify surface Dirac fermions through transport measurements. The prospects of topological insulator materials for elucidating novel quantum phenomena that await discovery conclude the review.

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“…Many of these compounds have been synthesized and ARPES Neupane et al 2012;Zhang, Chang, Zhang, et al 2011;Eremeev, Landolt, et al 2012;Okamoto et al 2012) and transport measurements (Xiong et al 2012;Taskin et al 2011;Ren et al 2010) are available. Theoretically predicted single surface Dirac cones have been observed in several of these materials via ARPES as well as pump-probe spectroscopy of unoccupied surface states.…”

Section: Ivb 3 Ternary Tetradymites Gembi2nte(m+3n) Seriesmentioning

confidence: 99%

Colloquium: Topological band theory

2016

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The first-principles band theory paradigm has been a key player not only in the process of discovering new classes of topologically interesting materials, but also for identifying salient characteristics of topological states, enabling direct and sharpened confrontation between theory and experiment. We begin this review by discussing underpinnings of the topological band theory, which basically involves a layer of analysis and interpretation for assessing topological properties of band structures beyond the standard band theory construct. Methods for evaluating topological invariants are delineated, including crystals without inversion symmetry and interacting systems. The extent to which theoretically predicted properties and protections of topological states have been verified experimentally is discussed, including work on topological crystalline insulators, disorder/interaction driven topological insulators (TIs), topological superconductors, Weyl semimetal phases, and topological phase transitions. Successful strategies for new materials discovery process are outlined. A comprehensive survey of currently predicted 2D and 3D topological materials is provided. This includes binary, ternary and quaternary compounds, transition metal and f-electron materials, Weyl and 3D Dirac semimetals, complex oxides, organometallics, skutterudites and antiperovskites. Also included is the emerging area of 2D atomically thin films beyond graphene of various elements and their alloys, functional thin films, multilayer systems, and ultra-thin films of 3D TIs, all of which hold exciting promise of wide-ranging applications. We conclude by giving a perspective on research directions where further work will broadly benefit the topological materials field.

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Observation of a highly spin-polarized topological surface state in GeBi2Te4

Cited by 64 publications

References 46 publications

Topological metal behavior in GeBi2Te4single crystals

Topological metal behavior in GeBi2Te4single crystals

Topological Insulator Materials

Colloquium: Topological band theory

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