Time-reversal symmetry breaking type-II Weyl state in YbMnBi2

被引：175

作者：

Borisenko, Sergey ^{[1
]}

Evtushinsky, Daniil ^{[1
,2
]}

Gibson, Quinn ^{[3
,4
]}

Yaresko, Alexander ^{[5
]}

Koepernik, Klaus ^{[6
]}

Kirnp, Timur ^{[7
]}

Ali, Mazhar ^{[3
]}

van den Brink, Jeroen ^{[6
,8
]}

Hoesch, Moritz ^{[7
,9
]}

Fedorov, Alexander ^{[1
]}

Haubold, Erik ^{[1
]}

KushnirenkoHD, Yevhen ^{[1
]}

Soldatov, Ivan ^{[10
,11
]}

Schaefer, Rudolf ^{[10
]}

Cava, Robert J. ^{[3
]}

机构：

[1] Leibniz IFW Dresden, Inst Solid State Res, Helmholtzstr 20, D-01069 Dresden, Germany

[2] Ecole Polytech Fed Lausanne, Inst Phys, CH-1015 Lausanne, Switzerland

[3] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

[4] Univ Liverpool, Dept Chem, Liverpool L69 7ZX, Merseyside, England

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

[6] Leibniz IFW Dresden, Inst Theoret Solid State Phys, Helmholtzstr 20, D-01069 Dresden, Germany

[7] Diamond Light Source, Harwell Campus, Didcot OX11 0DE, Oxon, England

[8] Tech Univ Dresden, Inst Solid State Phys, D-01062 Dresden, Germany

[9] DESY, Photon Sci, D-22607 Hamburg, Germany

[10] Leibniz IFW Dresden, Inst Metall Mat, Helmholtzstr 20, D-01069 Dresden, Germany

[11] Ural Fed Univ, Inst Nat Sci, Ekaterinburg 620002, Russia

来源：

NATURE COMMUNICATIONS | 2019年 / 10卷 / 1期

关键词：

DISCOVERY; FERMIONS; SEMIMETAL; ELECTRON; GAS;

D O I：

10.1038/s41467-019-11393-5

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Spectroscopic detection of Dirac and Weyl fermions in real materials is vital for both, promising applications and fundamental bridge between high-energy and condensed-matter physics. While the presence of Dirac and noncentrosymmetric Weyl fermions is well established in many materials, the magnetic Weyl semimetals still escape direct experimental detection. In order to find a time-reversal symmetry breaking Weyl state we design two materials and present here experimental and theoretical evidence of realization of such a state in one of them, YbMnBi2. We model the time-reversal symmetry breaking observed by magnetization and magneto-optical microscopy measurements by canted antiferromagnetism and find a number of Weyl points. Using angle-resolved photoemission, we directly observe two pairs of Weyl points connected by the Fermi arcs. Our results not only provide a fundamental link between the two areas of physics, but also demonstrate the practical way to design novel materials with exotic properties.

引用

页数：10

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