Flat Optical Conductivity in ZrSiS due to Two-Dimensional Dirac Bands

被引：80

作者：

Schilling, M. B. ^{[1
]}

Schoop, L. M. ^{[2
]}

Lotsch, B. V. ^{[2
]}

Dressel, M. ^{[1
]}

Pronin, A. V. ^{[1
]}

机构：

[1] Univ Stuttgart, Phys Inst, Pfaffenwaldring 57, D-70569 Stuttgart, Germany

[2] Max Planck Inst Solid State Res, Heisenbergstr 1, D-70569 Stuttgart, Germany

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 119卷 / 18期

关键词：

GRAPHENE; FERMIONS;

D O I：

10.1103/PhysRevLett.119.187401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

ZrSiS exhibits a frequency-independent interband conductivity sigma(omega) = constd (omega) equivalent to sigma(flat) in a broad range from 250 to 2500 cm(-1) (30-300 meV). This makes ZrSiS similar to (quasi-) two-dimensional Dirac electron systems, such as graphite and graphene. We assign the flat optical conductivity to the transitions between quasi-two-dimensional Dirac bands near the Fermi level. In contrast to graphene, sigma(flat) is not universal but related to the length of the nodal line in the reciprocal space, k(0). Because of spin-orbit coupling, the discussed Dirac bands in ZrSiS possess a small gap Delta, for which we determine an upper bound max(Delta) = 30 meV from our optical measurements. At low temperatures the momentum-relaxation rate collapses, and the characteristic length scale of momentum relaxation is of the order of microns below 50 K.

引用

页数：6

共 59 条

[1] Electrodynamics on Fermi Cyclides in Nodal Line Semimetals [J].

Ahn, Seongjin ;

Mele, E. J. ;

Min, Hongki .

PHYSICAL REVIEW LETTERS, 2017, 119 (14)

[2] Butterfly magnetoresistance, quasi-2D Dirac Fermi surface and topological phase transition in ZrSiS [J].

Ali, Mazhar N. ;

Schoop, Leslie M. ;

Garg, Chirag ;

Lippmann, Judith M. ;

Lara, Erik ;

Lotsch, Bettina ;

Parkin, Stuart S. P. .

SCIENCE ADVANCES, 2016, 2 (12)

[3] Dynamical conductivity and zero-mode anomaly in honeycomb lattices [J].

Ando, T ;

Zheng, YS ;

Suzuura, H .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2002, 71 (05) :1318-1324

[4]

Armitage N. P., REV MOD PHY IN PRESS

[5] Low-frequency optical conductivity in graphene and in other scale-invariant two-band systems [J].

Bacsi, Adam ;

Virosztek, Attila .

PHYSICAL REVIEW B, 2013, 87 (12)

[6] Negative local resistance caused by viscous electron backflow in graphene [J].

Bandurin, D. A. ;

Torre, I. ;

Kumar, R. Krishna ;

Ben Shalom, M. ;

Tomadin, A. ;

Principi, A. ;

Auton, G. H. ;

Khestanova, E. ;

Novoselov, K. S. ;

Grigorieva, I. V. ;

Ponomarenko, L. A. ;

Geim, A. K. ;

Polini, M. .

SCIENCE, 2016, 351 (6277) :1055-1058

[7] Topological nodal-line fermions in spin-orbit metal PbTaSe2 [J].

Bian, Guang ;

Chang, Tay-Rong ;

Sankar, Raman ;

Xu, Su-Yang ;

Zheng, Hao ;

Neupert, Titus ;

Chiu, Ching-Kai ;

Huang, Shin-Ming ;

Chang, Guoqing ;

Belopolski, Ilya ;

Sanchez, Daniel S. ;

Neupane, Madhab ;

Alidoust, Nasser ;

Liu, Chang ;

Wang, BaoKai ;

Lee, Chi-Cheng ;

Jeng, Horng-Tay ;

Zhang, Chenglong ;

Yuan, Zhujun ;

Jia, Shuang ;

Bansil, Arun ;

Chou, Fangcheng ;

Lin, Hsin ;

Hasan, M. Zahid .

NATURE COMMUNICATIONS, 2016, 7

[8] Topological nodal semimetals [J].

Burkov, A. A. ;

Hook, M. D. ;

Balents, Leon .

PHYSICAL REVIEW B, 2011, 84 (23)

[9] Optical response of a line node semimetal [J].

Carbotte, J. P. .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2017, 29 (04)

[10] The electronic properties of graphene [J].

Castro Neto, A. H. ;

Guinea, F. ;

Peres, N. M. R. ;

Novoselov, K. S. ;

Geim, A. K. .

REVIEWS OF MODERN PHYSICS, 2009, 81 (01) :109-162

← 1 2 3 4 5 6 →