Quantum oscillations in the type-II Dirac semi-metal candidate PtSe2

被引：32

作者：

Yang, Hao ^{[1
,2
]}

Schmidt, Marcus ^{[1
]}

Suess, Vicky ^{[1
]}

Chan, Mun ^{[3
]}

Balakirev, Fedor F. ^{[3
]}

McDonald, Ross D. ^{[3
]}

Parkin, Stuart S. P. ^{[2
]}

Felser, Claudia ^{[1
]}

Yan, Binghai ^{[1
,4
]}

Moll, Philip J. W. ^{[1
]}

机构：

[1] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

[2] Max Planck Inst Microstruct Phys, D-06120 Halle, Germany

[3] LANL, Natl High Magnet Field Lab, MS E536, Los Alamos, NM 87545 USA

[4] Weizmann Inst Sci, Dept Condensed Matter Phys, IL-7610001 Rehovot, Israel

来源：

NEW JOURNAL OF PHYSICS | 2018年 / 20卷

基金：

美国国家科学基金会; 欧洲研究理事会;

关键词：

Dirac-fermion; transition-metal dichalcogenide; focused ion beam; quantum oscillations; Fermi surface;

D O I：

10.1088/1367-2630/aab32f

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Three-dimensional topological semi-metals carry quasiparticle states that mimic massless relativistic Dirac fermions, elusive particles that have never been observed in nature. As they appear in the solid body, they are not bound to the usual symmetries of space-time and thus new types of fermionic excitations that explicitly violate Lorentz-invariance have been proposed, the so-called type-II Dirac fermions. We investigate the electronic spectrum of the transition-metal dichalcogenide PtSe2 by means of quantum oscillation measurements in fields up to 65 T. The observed Fermi surfaces agree well with the expectations from band structure calculations, that recently predicted a type-II Dirac node to occur in this material. A hole- and an electron-like Fermi surface dominate the semi-metal at the Fermi level. The quasiparticle mass is significantly enhanced over the bare band mass value, likely by phonon renormalization. Our work is consistent with the existence of type-II Dirac nodes in PtSe2, yet the Dirac node is too far below the Fermi level to support free Dirac-fermion excitations.

引用

页数：7

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