Emergent quasi-two-dimensional metallic state derived from the Mott-insulator framework

P. C. Chiang; S. C. Lin; C. Y. Chiang; C. S. Ku; S. W. Huang; J. M. Lee; Y. D. Chuang; H. J. Lin; Y. F. Liao; C. M. Cheng; S. C. Haw; J. M. Chen; Y. H. Chu; T. H. Do; C. W. Luo; J. Y. Juang; K. H. Wu; Y. W. Chang; J. C. Yang; J. Y. Lin

doi:10.1103/PhysRevB.107.075104

Emergent quasi-two-dimensional metallic state derived from the Mott-insulator framework

P. C. Chiang, S. C. Lin, C. Y. Chiang, C. S. Ku, S. W. Huang, J. M. Lee, Y. D. Chuang, H. J. Lin, Y. F. Liao, C. M. Cheng, S. C. Haw, J. M. Chen, Y. H. Chu, T. H. Do, C. W. Luo, J. Y. Juang, K. H. Wu, Y. W. Chang, J. C. Yang, J. Y. Lin

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Abstract

Recent quasi-two-dimensional (quasi-2D) systems with judicious exploitation of the atomic monolayer or few-layer architecture exhibit unprecedented physical properties that challenge the conventional wisdom on condensed matter physics. Here we show that the infinite layer SrCuO2 (SCO), a topical cuprate Mott insulator in bulk form, can manifest an unexpected metallic state in the quasi-2D limit when SCO is grown on TiO2-terminated SrTiO3 (STO) substrates. The sheet resistance does not conform to Landau's Fermi liquid paradigm. Hard x-ray core-level photoemission spectra demonstrate a definitive Fermi level that resembles the hole doped metal. Soft x-ray absorption spectroscopy also reveals features analogous to those of a hole doped Mott insulator. Based on these results, we conclude that the hole doping does not occur at the interfaces between SCO and STO; instead, it comes from the transient layers between the chain-type and the planar-type structures within the SCO slab. The present work reveals a metallic state in the infinite layer SCO and invites further examination to elucidate the spatial extent of this state.

Original language	English
Article number	075104
Journal	Physical Review B
Volume	107
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevB.107.075104
State	Published - 15 Feb 2023

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Chiang, P. C., Lin, S. C., Chiang, C. Y., Ku, C. S., Huang, S. W., Lee, J. M., Chuang, Y. D., Lin, H. J., Liao, Y. F., Cheng, C. M., Haw, S. C., Chen, J. M., Chu, Y. H., Do, T. H., Luo, C. W., Juang, J. Y., Wu, K. H., Chang, Y. W., Yang, J. C., & Lin, J. Y. (2023). Emergent quasi-two-dimensional metallic state derived from the Mott-insulator framework. Physical Review B, 107(7), Article 075104. https://doi.org/10.1103/PhysRevB.107.075104

@article{e39eadb11b8c4a2892c6104e5b220d01,

title = "Emergent quasi-two-dimensional metallic state derived from the Mott-insulator framework",

abstract = "Recent quasi-two-dimensional (quasi-2D) systems with judicious exploitation of the atomic monolayer or few-layer architecture exhibit unprecedented physical properties that challenge the conventional wisdom on condensed matter physics. Here we show that the infinite layer SrCuO2 (SCO), a topical cuprate Mott insulator in bulk form, can manifest an unexpected metallic state in the quasi-2D limit when SCO is grown on TiO2-terminated SrTiO3 (STO) substrates. The sheet resistance does not conform to Landau's Fermi liquid paradigm. Hard x-ray core-level photoemission spectra demonstrate a definitive Fermi level that resembles the hole doped metal. Soft x-ray absorption spectroscopy also reveals features analogous to those of a hole doped Mott insulator. Based on these results, we conclude that the hole doping does not occur at the interfaces between SCO and STO; instead, it comes from the transient layers between the chain-type and the planar-type structures within the SCO slab. The present work reveals a metallic state in the infinite layer SCO and invites further examination to elucidate the spatial extent of this state.",

author = "Chiang, {P. C.} and Lin, {S. C.} and Chiang, {C. Y.} and Ku, {C. S.} and Huang, {S. W.} and Lee, {J. M.} and Chuang, {Y. D.} and Lin, {H. J.} and Liao, {Y. F.} and Cheng, {C. M.} and Haw, {S. C.} and Chen, {J. M.} and Chu, {Y. H.} and Do, {T. H.} and Luo, {C. W.} and Juang, {J. Y.} and Wu, {K. H.} and Chang, {Y. W.} and Yang, {J. C.} and Lin, {J. Y.}",

note = "Publisher Copyright: {\textcopyright} 2023 American Physical Society.",

year = "2023",

month = feb,

day = "15",

doi = "10.1103/PhysRevB.107.075104",

language = "English",

volume = "107",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

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Chiang, PC, Lin, SC, Chiang, CY, Ku, CS, Huang, SW, Lee, JM, Chuang, YD, Lin, HJ, Liao, YF, Cheng, CM, Haw, SC, Chen, JM, Chu, YH, Do, TH, Luo, CW , Juang, JY, Wu, KH, Chang, YW, Yang, JC & Lin, JY 2023, 'Emergent quasi-two-dimensional metallic state derived from the Mott-insulator framework', Physical Review B, vol. 107, no. 7, 075104. https://doi.org/10.1103/PhysRevB.107.075104

TY - JOUR

T1 - Emergent quasi-two-dimensional metallic state derived from the Mott-insulator framework

AU - Chiang, P. C.

AU - Lin, S. C.

AU - Chiang, C. Y.

AU - Ku, C. S.

AU - Huang, S. W.

AU - Lee, J. M.

AU - Chuang, Y. D.

AU - Lin, H. J.

AU - Liao, Y. F.

AU - Cheng, C. M.

AU - Haw, S. C.

AU - Chen, J. M.

AU - Chu, Y. H.

AU - Do, T. H.

AU - Luo, C. W.

AU - Juang, J. Y.

AU - Wu, K. H.

AU - Chang, Y. W.

AU - Yang, J. C.

AU - Lin, J. Y.

PY - 2023/2/15

Y1 - 2023/2/15

N2 - Recent quasi-two-dimensional (quasi-2D) systems with judicious exploitation of the atomic monolayer or few-layer architecture exhibit unprecedented physical properties that challenge the conventional wisdom on condensed matter physics. Here we show that the infinite layer SrCuO2 (SCO), a topical cuprate Mott insulator in bulk form, can manifest an unexpected metallic state in the quasi-2D limit when SCO is grown on TiO2-terminated SrTiO3 (STO) substrates. The sheet resistance does not conform to Landau's Fermi liquid paradigm. Hard x-ray core-level photoemission spectra demonstrate a definitive Fermi level that resembles the hole doped metal. Soft x-ray absorption spectroscopy also reveals features analogous to those of a hole doped Mott insulator. Based on these results, we conclude that the hole doping does not occur at the interfaces between SCO and STO; instead, it comes from the transient layers between the chain-type and the planar-type structures within the SCO slab. The present work reveals a metallic state in the infinite layer SCO and invites further examination to elucidate the spatial extent of this state.

AB - Recent quasi-two-dimensional (quasi-2D) systems with judicious exploitation of the atomic monolayer or few-layer architecture exhibit unprecedented physical properties that challenge the conventional wisdom on condensed matter physics. Here we show that the infinite layer SrCuO2 (SCO), a topical cuprate Mott insulator in bulk form, can manifest an unexpected metallic state in the quasi-2D limit when SCO is grown on TiO2-terminated SrTiO3 (STO) substrates. The sheet resistance does not conform to Landau's Fermi liquid paradigm. Hard x-ray core-level photoemission spectra demonstrate a definitive Fermi level that resembles the hole doped metal. Soft x-ray absorption spectroscopy also reveals features analogous to those of a hole doped Mott insulator. Based on these results, we conclude that the hole doping does not occur at the interfaces between SCO and STO; instead, it comes from the transient layers between the chain-type and the planar-type structures within the SCO slab. The present work reveals a metallic state in the infinite layer SCO and invites further examination to elucidate the spatial extent of this state.

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U2 - 10.1103/PhysRevB.107.075104

DO - 10.1103/PhysRevB.107.075104

M3 - Article

AN - SCOPUS:85148331755

SN - 2469-9950

VL - 107

JO - Physical Review B

JF - Physical Review B

IS - 7

M1 - 075104

ER -

Emergent quasi-two-dimensional metallic state derived from the Mott-insulator framework

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