Anisotropic splitting and spin polarization of metallic bands due to spin-orbit interaction at the Ge(111)(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:mn>3</mml:mn></mml:msqrt><mml:mo>×</mml:mo><mml:msqrt><mml:mn>3</mml:mn></mml:msqrt></mml:mrow></mml:math>)<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi><mml:msup><mml:mn>30</mml:mn><mml:mo>∘</mml:mo></mml:msup></mml:mrow></mml:math>-Au surface

Nakatsuji, Kan; Niikura, Ryota; Shibata, Yoshiyuki; Yamada, Masamichi; Iimori, Takushi; Komori, Fumio; Oda, Y.; Ishii, Akira

doi:10.1103/physrevb.84.035436

Cited by 17 publications

(37 citation statements)

References 20 publications

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“…In common with all published ARPES data [29,32,44,45,47], the photon beam-spot used in our experiments is significantly larger than the average, nanometric size of the nanowire domains. This means that the measured ARPES signal is inescapably the sum of the signal from collections of the two orthogonal nanowire domains.…”

Section: A Arpes Datasupporting

confidence: 74%

“…Furthermore, straight features in constant energy E(k x , k y ) maps in ARPES [32,44] and linear conduction pathways observed in the troughs between the nanowires in STM data [29,38,43] would also seem to point towards the generation of Au-induced electronic states that show significant dispersion only in one k-direction, heralding the elusive Tomonaga-Luttinger liquid. On the other hand, this conclusion has been disputed based on results of fully analogous experiments carried out by other groups on the same Au/Ge(100) system [35,[45][46][47][48][49]. The data are argued to be more consistent with the Au-induced surface states being two-dimensional in nature [35,45].…”

Section: Introductionmentioning

confidence: 98%

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Gold-induced nanowires on the Ge(100) surface yield a 2D and not a 1D electronic structure

et al. 2016

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Atomic nanowires on semiconductor surfaces induced by the adsorption of metallic atoms have attracted a lot of attention as possible hosts of the elusive, one-dimensional Tomonaga-Luttinger liquid. The Au/Ge(100) system in particular is the subject of controversy as to whether the Au-induced nanowires do indeed host exotic, 1D metallic states. In light of this debate, we report here a thorough study of the electronic properties of high quality nanowires formed at the Au/Ge(100) surface. The high resolution ARPES data show the low-lying Auinduced electronic states to possess a dispersion relation that depends on two orthogonal directions in k-space. Comparison of the E(kx,ky) surface measured using high-resolution ARPES to tight-binding calculations yields hopping parameters in the two different directions that differ by a factor of two. Additionally, by pinpointing the Au-induced surface states in the first, second and third surface Brillouin zones, and analysing their periodicity in k || , the nanowire propagation direction seen clearly in STM can be imported into the ARPES data. We find that the larger of the two hopping parameters corresponds, in fact, to the direction perpendicular to the nanowires (tperp). This, the topology of the E=EF contour in k || , and the fact that t || /tperp∼0.5 proves that the Au-induced electron pockets possess a two-dimensional, closed Fermi surface, and this firmly places the Au/Ge(100) nanowire system outside potential hosts of a Tomonaga-Luttinger liquid. We combine these ARPES data with scanning tunneling spectroscopic measurements of the spatially-resolved electronic structure and find that the spatially straight -wire-like -conduction channels observed up to energies of order one electron volt below the Fermi level do not originate from the Au-induced states seen in the ARPES data. The former are rather more likely to be associated with bulk Ge states that are localized to the subsurface region. Despite our proof of the 2D nature of the Au-induced nanowire and sub-surface Ge-related states, an anomalous suppression of the density of states at the Fermi level is observed in both the STS and ARPES data, and this phenomenon is discussed in the light of the effects of disorder.

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Section: A Arpes Datasupporting

confidence: 74%

Section: Introductionmentioning

confidence: 98%

Gold-induced nanowires on the Ge(100) surface yield a 2D and not a 1D electronic structure

et al. 2016

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“…A confirmation of the validity of the CHCT model brings also the recent STM study for this surface [20]. Correctness of the CHCT model might question, however, a certain disagreement between the electronic structure calculated on the basis of this model and results of the angular-resolved-photoemission (ARPES) measurements for this surface [4,5,20]. Although calculations done within LDA or GGA theory reproduce the metallic surface state seen in experiments, the theoretically determined bottom of this surface state is energetically too high, the electronlike Fermi surface contour is too spherical (shows less hexagonal warping compared with experiment), and thediameter of this contour is too small.…”

Section: Results Of Geometry Optimizationssupporting

confidence: 66%

“…These properties have been recently found in the Ge(111) surface covered with a monolayer of a heavy metal. The -phase of ( √ 3 × √ 3)-Pb/Ge(111) [3] and the ( √ 3 × √ 3)-Au/Ge(111) [4][5][6] systems possess metallic surface bands which are split by the strong spin-orbit interaction.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Metallicity with a Large Spin-Orbit Splitting: DFT Calculations of the Atomic, Electronic, and Spin Structures of the Au/Ge(111)-(3×3)R30°
Fleszar
¹
,
Hanke
²

2015
Advances in Condensed Matter Physics
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0
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Density functional theory (DFT) is applied to study the atomic, electronic, and spin structures of the Au monolayer at the Ge(111) surface. It is found that the theoretically determined most stable atomic geometry is described by the conjugated honeycombchained-trimer (CHCT) model, in a very good agreement with experimental data. The calculated electronic structure of the system, being in qualitatively good agreement with the photoemission measurements, shows fingerprints of the many-body effects (selfinteraction corrections) beyond the LDA or GGA approximations. The most interesting property of this surface system is the large spin splitting of its metallic surface bands and the undulating spin texture along the hexagonal Fermi contours, which highly resembles the spin texture at the Dirac state of the topological insulator Bi 2 Te 3 . These properties make this system particularly interesting from both fundamental and technological points of view.

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“…Large Rashba splitting has been found on Bi/Si(111)8910, Bi/Ge(111)11, Tl/Si(111)1213, and Pt/Si(110)14 surfaces but it occurs in the non-metallic surface-state bands. The first metal/semiconductor reconstruction with a spin splitting of metallic surface-state band found was the 1516 followed by the 171819. As indicated in Ref.…”

mentioning

confidence: 83%

Large spin splitting of metallic surface-state bands at adsorbate-modified gold/silicon surfaces

Bondarenko

Грузнев

Yakovlev

et al. 2013

Sci Rep

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Finding appropriate systems with a large spin splitting of metallic surface-state band which can be fabricated on silicon using routine technique is an essential step in combining Rashba-effect based spintronics with silicon technology. We have found that originally poor structural and electronic properties of the surface can be substantially improved by adsorbing small amounts of suitable species (e.g., Tl, In, Na, Cs). The resultant surfaces exhibit a highly-ordered atomic structure and spin-split metallic surface-state band with a momentum splitting of up to 0.052 Å−1 and an energy splitting of up to 190 meV at the Fermi level. The family of adsorbate-modified surfaces, on the one hand, is thought to be a fascinating playground for exploring spin-splitting effects in the metal monolayers on a semiconductor and, on the other hand, expands greatly the list of material systems prospective for spintronics applications.

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Anisotropic splitting and spin polarization of metallic bands due to spin-orbit interaction at the Ge(111)(3×3)R30∘-Au surface

Cited by 17 publications

References 20 publications

Gold-induced nanowires on the Ge(100) surface yield a 2D and not a 1D electronic structure

Gold-induced nanowires on the Ge(100) surface yield a 2D and not a 1D electronic structure

Two-Dimensional Metallicity with a Large Spin-Orbit Splitting: DFT Calculations of the Atomic, Electronic, and Spin Structures of the Au/Ge(111)-(3×3)R30°
Fleszar
¹
,
Hanke
²

2015
Advances in Condensed Matter Physics
0
0
0
0
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Large spin splitting of metallic surface-state bands at adsorbate-modified gold/silicon surfaces

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Anisotropic splitting and spin polarization of metallic bands due to spin-orbit interaction at the Ge(111)(3×3)R30∘-Au surface

Cited by 17 publications

References 20 publications

Gold-induced nanowires on the Ge(100) surface yield a 2D and not a 1D electronic structure

Gold-induced nanowires on the Ge(100) surface yield a 2D and not a 1D electronic structure

Two-Dimensional Metallicity with a Large Spin-Orbit Splitting: DFT Calculations of the Atomic, Electronic, and Spin Structures of the Au/Ge(111)-(3×3)R30°Fleszar1, Hanke2 2015Advances in Condensed Matter Physics0000View full textAdd to dashboardCite

Large spin splitting of metallic surface-state bands at adsorbate-modified gold/silicon surfaces

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Resources

About

Two-Dimensional Metallicity with a Large Spin-Orbit Splitting: DFT Calculations of the Atomic, Electronic, and Spin Structures of the Au/Ge(111)-(3×3)R30°
Fleszar
¹
,
Hanke
²

2015
Advances in Condensed Matter Physics
0
0
0
0
View full text Add to dashboard Cite