Metallic Transport in a Monatomic Layer of In on a Silicon Surface

Yamazaki, Shiro; Hosomura, Yoshikazu; Matsuda, Iwao; Hobara, Rei; Eguchi, Toyoaki; Hasegawa, Yukio; Hasegawa, Shuji

doi:10.1103/physrevlett.106.116802

Cited by 59 publications

(55 citation statements)

References 24 publications

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“…As I-V and dI/dV curves in Fig. S1 in the Supplemental Material [33] show a finite differential conductivity at the Fermi energy (= 0 V), there is no band gap, indicating that the √7 × √3 is electronically metallic, in agreement with previous reports [12,13].…”

Section: Resultssupporting

confidence: 90%

“…Among these reconstructions, the √7 × √3 has attracted much interest recently, because it shows a free-electron-like two dimensional metallic state [12,13] and superconductivity at about 3 K [14][15][16][17][18]. It is reported that two phases of the √7 × √3 reconstruction exist, which show slightly different appearances in scanning tunneling microscopy (STM) images, from which they derive their names: a hexagonal and a rectangular phase (denoted as "hex" and "rect", hereafter).…”

Section: Introductionmentioning

confidence: 99%

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Indium coverage of the Si(111)- 7×3 -In surface

et al. 2017

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The Indium coverage of the Si(111)-√7 × √3-In surface is investigated by means of X-ray photoelectron spectroscopy and first-principles density functional theory calculations. Both experimental and theoretical results indicate that the In coverage is rather a double layer than a single layer. Moreover, the atomic structure of the Si(111)-√7 × √3-In surface is discussed by comparing experimental with simulated scanning tunneling microscopy (STM) images and scanning tunneling spectra with the calculated density of states. Our structural assignment agrees with previous studies except for the interpretation of experimental STM images.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Indium coverage of the Si(111)- 7×3 -In surface

et al. 2017

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“…Robust superconductivity has already been reported in some atomically thin conventional superconductors [32][33][34] . Our investigations reveal that this phenomenon could also be observed in high-T c superconductor.…”

Section: Discussionmentioning

confidence: 97%

High-Tc superconductivity in ultrathin Bi2Sr2CaCu2O8+x down to half-unit-cell thickness by protection with graphene

Jiang

You

et al. 2014

Nat Commun

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High-T c superconductors confined to two dimension exhibit novel physical phenomena, such as superconductor-insulator transition. In the Bi 2 Sr 2 CaCu 2 O 8 þ x (Bi2212) model system, despite extensive studies, the intrinsic superconducting properties at the thinness limit have been difficult to determine. Here, we report a method to fabricate high quality single-crystal Bi2212 films down to half-unit-cell thickness in the form of graphene/Bi2212 van der Waals heterostructure, in which sharp superconducting transitions are observed. The heterostructure also exhibits a nonlinear current-voltage characteristic due to the Dirac nature of the graphene band structure. More interestingly, although the critical temperature remains essentially the same with reduced thickness of Bi2212, the slope of the normal state T-linear resistivity varies by a factor of 4-5, and the sheet resistance increases by three orders of magnitude, indicating a surprising decoupling of the normal state resistance and superconductivity. The developed technique is versatile, applicable to investigate other two-dimensional (2D) superconducting materials.

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“…One representative system of recent interest is the In/Si(111)-( √ 7× √ 3) surface, where the In overlayer was generally assumed to be one atom thick [6][7][8] and so represent an ideal two-dimensional (2D) limit of metallic In properties. Fascinating electronic features of the In overlayer, including a nearlyfree-electron Fermi surface, [9], superconducting transitions [10,11], and an intriguing metallic transport behavior [12], have been explored and referred to as revealing the ultimate 2D limit. With little structural information about the In overlayer, however, its actual layer thickness has long been an open question.…”

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confidence: 99%