Closing of the Mott gap near step edges in NiS2

Fuente: arXiv

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Autori principali:	Yasui, Yuuki, Iwata, Kota, Okazaki, Shota, Miyasaka, Shigeki, Sugimoto, Yoshiaki, Hanaguri, Tetsuo, Takagi, Hidenori, Sasagawa, Takao
Natura:	Preprint
Pubblicazione:	2024
Soggetti:	Strongly Correlated Electrons
Accesso online:	Acceder al recurso
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author	Yasui, Yuuki Iwata, Kota Okazaki, Shota Miyasaka, Shigeki Sugimoto, Yoshiaki Hanaguri, Tetsuo Takagi, Hidenori Sasagawa, Takao
author_facet	Yasui, Yuuki Iwata, Kota Okazaki, Shota Miyasaka, Shigeki Sugimoto, Yoshiaki Hanaguri, Tetsuo Takagi, Hidenori Sasagawa, Takao
contents	A prototypical charge-transfer type Mott insulator NiS2 pyrite exhibits a metal-insulator transition with bandwidth control. Recent discoveries on surface-specific electronic states on other 3d transition-metal disulfide pyrites motivate us to further investigate the surface of NiS2, where metallic surface conduction is discussed. Here, the spectroscopic-imaging scanning-tunneling-microscopy observations revealed that the surface is not metallic, contrary to the expectation. Instead, the Mott gap is closed near step edges, suggesting possible electrical conduction from one-dimensional channels. The edge anomaly was observed irrespective of its magnetic order and is limited to the insulator phases.
format	Preprint
id	arxiv_https___arxiv_org_abs_2407_19636
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Closing of the Mott gap near step edges in NiS2 Yasui, Yuuki Iwata, Kota Okazaki, Shota Miyasaka, Shigeki Sugimoto, Yoshiaki Hanaguri, Tetsuo Takagi, Hidenori Sasagawa, Takao Strongly Correlated Electrons A prototypical charge-transfer type Mott insulator NiS2 pyrite exhibits a metal-insulator transition with bandwidth control. Recent discoveries on surface-specific electronic states on other 3d transition-metal disulfide pyrites motivate us to further investigate the surface of NiS2, where metallic surface conduction is discussed. Here, the spectroscopic-imaging scanning-tunneling-microscopy observations revealed that the surface is not metallic, contrary to the expectation. Instead, the Mott gap is closed near step edges, suggesting possible electrical conduction from one-dimensional channels. The edge anomaly was observed irrespective of its magnetic order and is limited to the insulator phases.
title	Closing of the Mott gap near step edges in NiS2
topic	Strongly Correlated Electrons
url	https://arxiv.org/abs/2407.19636

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