Direct observation of kink evolution due to Hund’s coupling on approach to metal-insulator transition in NiS2−x Se x

Bo Gyu Jang; Garam Han; Ina Park; Dongwook Kim; Yoon Young Koh; Yeongkwan Kim; Wonshik Kyung; Hyeong-Do Kim; Cheng-Maw Cheng; Ku-Ding Tsuei; Kyung Dong Lee; Namjung Hur; Ji Hoon Shim; Changyoung Kim; Gabriel Kotliar

doi:10.1038/s41467-021-21460-5

Nature Communications (Feb 2021)

Direct observation of kink evolution due to Hund’s coupling on approach to metal-insulator transition in NiS2−x Se x

Bo Gyu Jang,
Garam Han,
Ina Park,
Dongwook Kim,
Yoon Young Koh,
Yeongkwan Kim,
Wonshik Kyung,
Hyeong-Do Kim,
Cheng-Maw Cheng,
Ku-Ding Tsuei,
Kyung Dong Lee,
Namjung Hur,
Ji Hoon Shim,
Changyoung Kim,
Gabriel Kotliar

Affiliations

Bo Gyu Jang: Department of Chemistry, Pohang University of Science and Technology
Garam Han: Center for Correlated Electron Systems, Institute for Basic Science (IBS)
Ina Park: Department of Chemistry, Pohang University of Science and Technology
Dongwook Kim: Department of Chemistry, Pohang University of Science and Technology
Yoon Young Koh: Max Plank POSTECH Center for Complex Phase Materials, Pohang University of Science and Technology
Yeongkwan Kim: Department of Physics, KAIST
Wonshik Kyung: Center for Correlated Electron Systems, Institute for Basic Science (IBS)
Hyeong-Do Kim: Center for Correlated Electron Systems, Institute for Basic Science (IBS)
Cheng-Maw Cheng: National Synchrotron Radiation Research Center
Ku-Ding Tsuei: National Synchrotron Radiation Research Center
Kyung Dong Lee: Department of Physics, Inha University
Namjung Hur: Department of Physics, Inha University
Ji Hoon Shim: Department of Chemistry, Pohang University of Science and Technology
Changyoung Kim: Center for Correlated Electron Systems, Institute for Basic Science (IBS)
Gabriel Kotliar: Department of Physics and Astronomy, Rutgers University

DOI: https://doi.org/10.1038/s41467-021-21460-5
Journal volume & issue: Vol. 12, no. 1
pp. 1 – 7

Abstract

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A decisive spectroscopic evidence of the Hund’s coupling energy scale in multi-orbital correlated systems has been lacking. Here, the authors identify a kink feature due to Hund´s coupling in the spectral function of NiS2x Se x as they track its evolution across the Mott-insulator transition.

Published in Nature Communications

ISSN: 2041-1723 (Online)
Publisher: Nature Portfolio
Country of publisher: United Kingdom
LCC subjects: Science
Website: https://www.nature.com/ncomms/

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