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Gao, Jianhua
원자제어 저차원 전자계 연구단
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Pseudogap and Weak Multifractality in 2D Disordered Mott Charge-Density-Wave Insulator

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Title
Pseudogap and Weak Multifractality in 2D Disordered Mott Charge-Density-Wave Insulator
Author(s)
Jianhua Gao; Jae Whan Park; Kiseok Kim; Sun Kyu Song; Hae Ryong Park; Jhinhwan Lee; Jewook Park; Fangchu Chen; Xuan Luo; Yuping Sun; Han Woong Yeom
Subject
charge density wave, ; Mott insulator, ; transition metal dichalcogenide, ; pseudogap, ; multifractality, ; disorder
Publication Date
2020-09
Journal
NANO LETTERS, v.20, no.9, pp.6299 - 6305
Publisher
AMER CHEMICAL SOC
Abstract
© 2020 American Chemical Society. We investigate electronic states of Se-substituted 1T-TaS2 by scanning tunneling microscopy/spectroscopy (STM/STS), where superconductivity emerges from the unique Mott-charge-density-wave (Mott-CDW) state. Spatially resolved STS measurements reveal that a pseudogap replaces the Mott gap with the CDW gaps intact. The pseudogap has little correlation with the unit-cell-to-unit-cell variation in the local Se concentration but appears globally. The correlation length of the local density of states (LDOS) is substantially enhanced at the Fermi energy and decays rapidly at high energies. Furthermore, the statistical analysis of LDOS indicates the weak multifractal behavior of the wave functions. These findings suggest a correlated metallic state induced by disorder and provide a new insight into the emerging superconductivity in two-dimensional materials
URI
https://pr.ibs.re.kr/handle/8788114/7646
DOI
10.1021/acs.nanolett.0c01607
ISSN
1530-6984
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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