Pseudogap and Weak Multifractality in 2D Disordered Mott Charge-Density-Wave Insulator

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

doi:10.1021/acs.nanolett.0c01607

Pseudogap and Weak Multifractality in 2D Disordered Mott Charge-Density-Wave Insulator

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

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	6299-6305
Number of pages	7
Journal	Nano Letters
Volume	20
Issue number	9
DOIs	https://doi.org/10.1021/acs.nanolett.0c01607
State	Published - Sep 9 2020
Externally published	Yes

Funding

This work was supported by the Institute for Basic Science (Grant No. IBS-R014-D1). H.W.Y. appreciates discussion with C. W. Park. F.C., X.L., and Y.S. thank the support of the National Key Research and Development Program (Grant No. 2016YFA0300404) and the National Nature Science Foundation of China (Grant No. 11674326/11874357) and the Joint Funds of the National Natural Science Foundation of China and the Chinese Academy of Sciences Large-Scale Scientific Facility (Grant No. U1832141).

Funders	Funder number
Chinese Academy of Sciences Large-Scale Scientific Facility	U1832141
National Natural Science Foundation of China	11674326/11874357
Institute for Basic Science	IBS-R014-D1
National Key Research and Development Program of China	2016YFA0300404

Keywords

Mott insulator
charge density wave
disorder
multifractality
pseudogap
transition metal dichalcogenide

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10.1021/acs.nanolett.0c01607

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title = "Pseudogap and Weak Multifractality in 2D Disordered Mott Charge-Density-Wave Insulator",

abstract = "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.",

keywords = "Mott insulator, charge density wave, disorder, multifractality, pseudogap, transition metal dichalcogenide",

author = "Jianhua Gao and Park, {Jae Whan} and Kiseok Kim and Song, {Sun Kyu} and Park, {Hae Ryong} and Jhinhwan Lee and Jewook Park and Fangchu Chen and Xuan Luo and Yuping Sun and Yeom, {Han Woong}",

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AU - Gao, Jianhua

AU - Park, Jae Whan

AU - Kim, Kiseok

AU - Song, Sun Kyu

AU - Park, Hae Ryong

AU - Lee, Jhinhwan

AU - Park, Jewook

AU - Chen, Fangchu

AU - Luo, Xuan

AU - Sun, Yuping

AU - Yeom, Han Woong

PY - 2020/9/9

Y1 - 2020/9/9

N2 - 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.

AB - 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.

KW - Mott insulator

KW - charge density wave

KW - disorder

KW - multifractality

KW - pseudogap

KW - transition metal dichalcogenide

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Pseudogap and Weak Multifractality in 2D Disordered Mott Charge-Density-Wave Insulator

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