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원자제어 저차원 전자계 연구단
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Emergence of Two-Dimensional Massless Dirac Fermions, Chiral Pseudospins, and Berrys Phase in Potassium Doped Few-Layer Black Phosphorus

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Title
Emergence of Two-Dimensional Massless Dirac Fermions, Chiral Pseudospins, and Berrys Phase in Potassium Doped Few-Layer Black Phosphorus
Author(s)
Baik S.S.; Keun Su Kim; Yi Y.; Choi H.J.
Publication Date
2015-12
Journal
NANO LETTERS, v.15, no.12, pp.7788 - 7793
Publisher
AMER CHEMICAL SOC
Abstract
Thin flakes of black phosphorus (BP) are a two-dimensional (2D) semiconductor whose energy gap is predicted being sensitive to the number of layers and external perturbations. Very recently, it was found that a simple method of potassium (K) doping on the surface of BP closes its band gap completely, producing a Dirac semimetal state with a linear band dispersion in the armchair direction and a quadratic one in the zigzag direction. Here, based on first-principles density functional calculations, we predict that, beyond the critical K density of the gap closure, 2D massless Dirac Fermions (i.e., Dirac cones) emerge in K-doped few-layer BP, with linear band dispersions in all momentum directions, and the electronic states around Dirac points have chiral pseudospins and Berrys phase. These features are robust with respect to the spin-orbit interaction and may lead to graphene-like electronic transport properties with greater flexibility for potential device applications. © 2015 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/2218
ISSN
1530-6984
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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