Observation of time-reversal symmetry breaking in the band structure of altermagnetic RuO2

被引：144

作者：

Fedchenko, Olena ^{[1
]}

Minar, Jan ^{[2
]}

Akashdeep, Akashdeep ^{[1
]}

D'Souza, Sunil Wilfred ^{[2
]}

Vasilyev, Dmitry ^{[1
]}

Tkach, Olena ^{[1
,3
]}

Odenbreit, Lukas ^{[1
]}

Nguyen, Quynh ^{[4
]}

Kutnyakhov, Dmytro ^{[5
]}

Wind, Nils ^{[6
,7
,8
]}

Wenthaus, Lukas ^{[5
]}

Scholz, Markus ^{[6
]}

Rossnagel, Kai ^{[6
,8
]}

Hoesch, Moritz ^{[5
]}

Aeschlimann, Martin ^{[9
]}

Stadtmueller, Benjamin ^{[1
]}

Klaeui, Mathias ^{[1
]}

Schoenhense, Gerd ^{[1
]}

Jungwirth, Tomas ^{[10
,11
]}

Hellenes, Anna Birk ^{[1
]}

Jakob, Gerhard ^{[1
]}

Smejkal, Libor ^{[1
,10
]}

Sinova, Jairo ^{[1
,10
]}

Elmers, Hans-Joachim ^{[1
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Phys, Staudingerweg 7, D-55128 Mainz, Germany

[2] Univ West Bohemia, New Technol Res Ctr, Plzen 30100, Czech Republic

[3] Sumy State Univ, Rymski Korsakov 2, UA-40007 Sumy, Ukraine

[4] SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA

[5] Deutsch Elektronen Synchrotron DESY, D-22607 Hamburg, Germany

[6] Deutsch Elektronen Synchrotron DESY, Ruprecht Haensel Lab, D-22607 Hamburg, Germany

[7] Univ Hamburg, Inst Expt phys, D-22761 Hamburg, Germany

[8] Christian Albrechts Univ Kiel, Inst Expt & Angew Phys, D-24098 Kiel, Germany

[9] Univ Kaiserslautern, Dept Phys, D-67663 Kaiserslautern, Germany

[10] Acad Sci Czech Republ, Inst Phys, Cukrovarnicka 10, Prague, Czech Republic

[11] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

来源：

SCIENCE ADVANCES | 2024年 / 10卷 / 05期

关键词：

MAGNETIC CIRCULAR-DICHROISM; SPIN POLARIZATION; PHOTOEMISSION; SURFACE; MEMORY;

D O I：

10.1126/sciadv.adj4883

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：

Altermagnets are an emerging elementary class of collinear magnets. Unlike ferromagnets, their distinct crystal symmetries inhibit magnetization while, unlike antiferromagnets, they promote strong spin polarization in the band structure. The corresponding unconventional mechanism of time-reversal symmetry breaking without magnetization in the electronic spectra has been regarded as a primary signature of altermagnetism but has not been experimentally visualized to date. We directly observe strong time-reversal symmetry breaking in the band structure of altermagnetic RuO2 by detecting magnetic circular dichroism in angle-resolved photoemission spectra. Our experimental results, supported by ab initio calculations, establish the microscopic electronic structure basis for a family of interesting phenomena and functionalities in fields ranging from topological matter to spintronics, which are based on the unconventional time-reversal symmetry breaking in altermagnets.

引用

页数：6

共 60 条

[31] Writing magnetic memory with ultrashort light pulses [J].