Band hybridization at the semimetal-semiconductor transition of Ta2NiSe5 enabled by mirror-symmetry breaking

被引：57

作者：

Watson, Matthew D. ^{[1
]}

Markovic, Igor ^{[1
,2
]}

Morales, Edgar Abarca ^{[1
,2
]}

Le Fevre, Patrick ^{[3
]}

Merz, Michael ^{[4
]}

Haghighirad, Amir A. ^{[4
]}

King, Philip D. C. ^{[1
]}

机构：

[1] Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland

[2] Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany

[3] Synchrotron SOLEIL, Lorme Merisiers, BP48, F-91192 Gif Sur Yvette, France

[4] Karlsruhe Inst Technol, Inst Quantum Mat & Technol, D-76021 Karlsruhe, Germany

来源：

PHYSICAL REVIEW RESEARCH | 2020年 / 2卷 / 01期

基金：

欧盟地平线“2020”;

关键词：

Crystal symmetry - Density functional theory - Mirrors - Tantalum compounds - Photoemission - Electronic structure - Nickel compounds;

D O I：

10.1103/PhysRevResearch.2.013236

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a combined study from angle-resolved photoemission and density-functional-theory calculations of the temperature-dependent electronic structure in the excitonic insulator candidate Ta2NiSe5. Our experimental measurements unambiguously establish the normal state as a semimetal with a significant band overlap of >100 meV. Our temperature-dependent measurements indicate how these low-energy states hybridize when cooling through the well-known 327 K phase transition in this system. From our calculations and polarization-dependent photoemission measurements, we demonstrate the importance of a loss of mirror symmetry in enabling the band hybridization, driven by a shearlike structural distortion which reduces the crystal symmetry from orthorhombic to monoclinic. Our results thus point to the key role of the lattice distortion in enabling the phase transition of Ta2NiSe5.

引用

页数：6

共 34 条

[1]

Blaha P., 2018, AUGMENTED PLANE WAVE

[2] Possibility of an excitonic insulator at the semiconductor-semimetal transition [J].

Bronold, Franz X. ;

Fehske, Holger .

PHYSICAL REVIEW B, 2006, 74 (16)

[3] Charge-Density Wave and Superconducting Dome in TiSe2 from Electron-Phonon Interaction [J].

Calandra, Matteo ;

Mauri, Francesco .

PHYSICAL REVIEW LETTERS, 2011, 106 (19)

[4] Angle-resolved photoemission studies of the cuprate superconductors [J].

Damascelli, A ;

Hussain, Z ;

Shen, ZX .

REVIEWS OF MODERN PHYSICS, 2003, 75 (02) :473-541

[5] Electrical Tuning of the Excitonic Insulator Ground State of Ta2NiSe5 [J].

Fukutani, Keisuke ;

Stania, Roland ;

Jung, Jiwon ;

Schwier, Eike F. ;

Shimada, Kenya ;

Kwon, Chang Il ;

Kim, Jun Sung ;

Yeom, Han Woong .

PHYSICAL REVIEW LETTERS, 2019, 123 (20)

[6] EXCITONIC INSULATOR [J].

JEROME, D ;

RICE, TM ;

KOHN, W .

PHYSICAL REVIEW, 1967, 158 (02) :462-+

[7] Orthorhombic-to-monoclinic phase transition of Ta2NiSe5 induced by the Bose-Einstein condensation of excitons [J].

Kaneko, T. ;

Toriyama, T. ;

Konishi, T. ;

Ohta, Y. .

PHYSICAL REVIEW B, 2013, 87 (03)

[8]

Kaneko Tatsuya, 2016, THEORETICAL STUDY EX

[9] Electron-hole coupling and the charge density wave transition in TiSe2 -: art. no. 226402 [J].

Kidd, TE ;

Miller, T ;

Chou, MY ;

Chiang, TC .

PHYSICAL REVIEW LETTERS, 2002, 88 (22) :226402/1-226402/4

[10] Signatures of exciton condensation in a transition metal dichalcogenide [J].

Kogar, Anshul ;

Rak, Melinda S. ;

Vig, Sean ;

Husain, Ali A. ;

Flicker, Felix ;

Il Joe, Young ;

Venema, Luc ;

MacDougall, Greg J. ;

Chiang, Tai C. ;

Fradkin, Eduardo ;

van Wezel, Jasper ;

Abbamonte, Peter .

SCIENCE, 2017, 358 (6368) :1315-+

← 1 2 3 4 →