Constructing Anisotropic Single-Dirac-Cones in Bi1–xSbx Thin Films

Tang, Shuang; Dresselhaus, M. S.

doi:10.1021/nl300064d

Cited by 38 publications

(35 citation statements)

References 62 publications

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“…5(a), with anisotropic energy dispersions and velocities of Dirac carriers. This anisotropy is a direct consequence of the reduced symmetry of these surfaces, and results in novel direction dependent properties of the carriers, which would potentially allow manipulation and engineering of new materials platforms for magneto-electronic devices such as anisotropic-magnetic-sensors, [48][49][50] and use in table-top experiments to simulate high energy particles propagating in anisotropic space. 48,49 Other applications based on differences in carrier velocities at the interfaces of surfaces have been suggested.…”

Section: Energy (Ev)mentioning

confidence: 99%

Role of surface termination in realizing well-isolated topological surface states within the bulk band gap inTlBiSe2andTlBiTe2

et al. 2016

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Electronic structures associated with the flat (polar) Se/Te-or Tl-terminated surfaces of TlBiSe2 and TlBiTe2 are predicted to harbor not only the Dirac cone states, but also the trivial dangling bond states near the Fermi energy. However, the latter, trivial states have never been observed in photoemission measurements. In order to address this discrepancy, we have carried out ab-inito calculations for various surfaces of TlBiSe2 and TlBiTe2. A rough nonpolar surface with an equal number of Se/Te and Tl atoms in the surface atomic layer is found to destroy the trivial dangling bond states, leaving only the Dirac cone states in the bulk energy gap. The resulting energy dispersions of the Dirac states are in good accord with the corresponding experimental dispersions in TlBiSe2 as well as TlBiTe2. We also show that in the case of flat, Se terminated, high-index (221) and (112) surfaces of TlBiSe2, the trivial surface states shift energetically below the Dirac node and become well-separated from the Dirac cone states.2

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Section: Energy (Ev)mentioning

confidence: 99%

Role of surface termination in realizing well-isolated topological surface states within the bulk band gap inTlBiSe2andTlBiTe2

et al. 2016

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“…6 Tang et al have predicted the possibility for constructing a large variety of Dirac-cone materials based on the Bi 1−x Sb x thin-film system. 7,8 Thus, a phase diagram for the Bi 1−x Sb x thin-film system is strongly needed for experimentalists as a guide for sample synthesis for different research purposes. Such a phase diagram for the Bi 1−x Sb x thin-film system, however, has not yet been reported.…”

Section: Introductionmentioning

confidence: 99%

Phase diagrams of Bi1−xSbxthin films with different growth orientations

Tang

Dresselhaus

2012

Phys. Rev. B

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A closed-form model is developed to evaluate the band-edge shift caused by quantum confinement for a two-dimensional nonparabolic carrier pocket. Based on this model, the symmetries and the band shifts of different carrier pockets are evaluated for Bi 1−x Sb x thin films that are grown along different crystalline axes. The phase diagrams for the Bi 1−x Sb x thin film systems with different growth orientations are calculated and analyzed.

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“…Many of graphene's interesting properties, including its integer quantum Hall effect, originate from its unique linear dispersion relations at the corner of the Brillouin zone (BZ), the so-called Dirac point. 1 Not restricted to quantum systems, [1][2][3][4] this special kind of linear dispersion relation is also found in classical periodic systems including photonic and phononic crystals (PCs), where interesting wave transport phenomena like pseudo-diffusion, cloaking of an object, and classical analogs of the Zitterbewegung have been studied. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] The linear dispersion relations in classical systems at high symmetry points in the BZ can be categorized into two types.…”

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confidence: 99%

Double Dirac cones in phononic crystals

Mei

2014

Applied Physics Letters

116

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A double Dirac cone is realized at the center of the Brillouin zone of a two-dimensional phononic crystal (PC) consisting of a triangular array of core-shell-structure cylinders in water. The double Dirac cone is induced by the accidental degeneracy of two double-degenerate Bloch states. Using a perturbation method, we demonstrate that the double Dirac cone is composed of two identical and overlapping Dirac cones whose linear slopes can also be accurately predicted from the method. Because the double Dirac cone occurs at a relatively low frequency, a slab of the PC can be mapped onto a slab of zero refractive index material by using a standard retrieval method. Total transmission without phase change and energy tunneling at the double Dirac point frequency are unambiguously demonstrated by two examples. Potential applications can be expected in diverse fields such as acoustic wave manipulations and energy flow control.

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Constructing Anisotropic Single-Dirac-Cones in Bi_1–xSb_x Thin Films

Cited by 38 publications

References 62 publications

Role of surface termination in realizing well-isolated topological surface states within the bulk band gap inTlBiSe2andTlBiTe2

Role of surface termination in realizing well-isolated topological surface states within the bulk band gap inTlBiSe2andTlBiTe2

Phase diagrams of Bi1−xSbxthin films with different growth orientations

Double Dirac cones in phononic crystals

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