Light- induced insulator-metal transition in Sr₂IrO₄ reveals the nature of the insulating ground state

Choi, Dongsung1; Yue, Changming2,3; Azoury, Doron4; Porter, Zachary5,6; Chen, Jiyu; Petocchi, Francesco2; Baldini, Edoardo4,7; Lv, Baiqing4,8; Mogi, Masataka4,9; Su, Yifan4; Wilson, Stephen D.5; Eckstein, Martin10,11; Werner, Philipp2; Gedik, Nuh4

2024-07-16

10.1073/pnas.2323013121

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   影响因子和分区

0027-8424

1091-6490

Sr2IrO4 2 IrO 4 has attracted considerable attention due to its structural and electronic similarities to La2CuO4, 2 CuO 4 , the parent compound of high-- T c superconducting cuprates. It was proposed as a strong spin-orbit-- coupled J e ff = 1/2 Mott insulator, but the Mott nature of its insulating ground state has not been conclusively established. Here, we use ultrafast laser pulses to realize an insulator-metal transition in Sr2IrO4 2 IrO 4 and probe the resulting dynamics using time-- and angle-- resolved photoemission spectroscopy. We observe a gap closure and the formation of weakly renormalized electronic bands in the gap region. Comparing these observations to the expected temperature and doping evolution of Mott gaps and Hubbard bands provides clear evidence that the insulating state does not originate from Mott correlations. We instead propose a correlated band insulator picture, where antiferromagnetic correlations play a key role in the gap opening. More broadly, our results demonstrate that energy-momentum-- resolved nonequilibrium dynamics can be used to clarify the nature of equilibrium states in correlated materials.

correlated band insulator light-- induced insulator-metal transition time and angle resolved photoemission spectroscopy cluster dynamical mean- field theory

SCI

英语

其他

Army Research Office (ARO) MURI Grant[W911NF-16-1-0361] ; Gordon and Betty Moore Foundation's EPiQS Initiative[GBMF9459] ; Swiss NSF[200021-196966] ; European Research Council (ERC)[724103] ; NSF[DMR-1729489]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:001279325400011

NATL ACAD SCIENCES

BIOLOGY & BIOCHEMISTRY ; CLINICAL MEDICINE ; MULTIDISCIPLINARY ; PLANT & ANIMAL SCIENCE ; ENVIRONMENT/ECOLOGY ; SOCIAL SCIENCES, GENERAL ; MICROBIOLOGY ; ECONOMICS BUSINESS ; IMMUNOLOGY ; MATERIALS SCIENCE ; MATHEMATICS ; SPACE SCIENCE ; MOLECULAR BIOLOGY & GENETICS ; PHARMACOLOGY & TOXICOLOGY ; CHEMISTRY ; PSYCHIATRY/PSYCHOLOGY ; NEUROSCIENCE & BEHAVIOR ; PHYSICS ; GEOSCIENCES ; AGRICULTURAL SCIENCES ; ENGINEERING

Web of Science

1.MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
2.Univ Fribourg, Dept Phys, CH-1700 Fribourg, Switzerland
3.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
4.MIT, Dept Phys, Cambridge, MA 02139 USA
5.Univ Calif Santa Barbara, Mat Dept, Santa Barbara, CA 93106 USA
6.Stanford Univ, Stanford Linear Accelerator Ctr SLAC, Natl Accelerator Lab, Stanford, CA 94025 USA
7.Univ Texas Austin, Dept Phys, Austin, TX 78705 USA
8.Shanghai Jiao Tong Univ, Sch Phys & Astron, Shanghai 200240, Peoples R China
9.Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan
10.Univ Erlangen Nurnberg, Dept Phys, D-91058 Erlangen, Germany
11.Univ Hamburg, Inst Theoret Phys, D-20355 Hamburg, Germany

Choi, Dongsung,Yue, Changming,Azoury, Doron,et al. Light- induced insulator-metal transition in Sr₂IrO₄ reveals the nature of the insulating ground state[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2024,121(29).

Choi, Dongsung.,Yue, Changming.,Azoury, Doron.,Porter, Zachary.,Chen, Jiyu.,...&Gedik, Nuh.(2024).Light- induced insulator-metal transition in Sr₂IrO₄ reveals the nature of the insulating ground state.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,121(29).

Choi, Dongsung,et al."Light- induced insulator-metal transition in Sr₂IrO₄ reveals the nature of the insulating ground state".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 121.29(2024).