Effects of orbital composition in a pair of spin-orbit-split surface bands at Tl/Ge(111)

Eickholt, Philipp; Krüger, Peter; Stolwijk, Sebastian D.; Schmidt, Anke B.; Donath, M.

doi:10.1103/physrevb.93.085412

Cited by 12 publications

(6 citation statements)

References 37 publications

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“…As already mentioned in the context of the discussion along the K direction, the existence of S z components in all the other directions is allowed within C 3v symmetry, if higher-order Rashba-and/or internal Zeemantype effects are considered [43]. Please note, in contrast to Tl/Ge(111) [25] and Tl/Si(111) [26], the shift in energy of the S2 surface band in M direction at the K √ 3 point is due to an effective magnetic field in the y direction rather than in the z direction.…”

Section: A Characterization Of the Cemmentioning

confidence: 98%

“…For example, for the Au/Ge(111)-( √ 3× √ 3) system, at least third-and fifth-order corrections in k are mandatory to explain the z components of the spin-polarization vectors of the Fermi surface (FS) [23]. Moreover, a local Zeeman-type splitting with fully spin-polarized states along the surface normal was found recently at the K point of the surface Brillouin zone (SBZ) of the (1×1) reconstruction for 1 ML Tl on Si(111) and Ge(111) [24,25]. The origin was explained as a result of the local C 3 symmetry around the K points in systems of space group p3m1 giving rise to an effective magnetic field along the surface normal (H SOC ∝ σ z B z ) [26,27] in contrast to the typical RB in-plane effective B field.…”

Section: Introductionmentioning

confidence: 99%

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Spin-resolved band structure of a densely packed Pb monolayer on Si(111)

et al. 2017

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Monolayer structures of Pb on Si(111) attracted recently considerable interest as superconductivity was found in these truly two-dimensional (2D) structures. In this study, we analyzed the electronic surface band structure of the so-called striped incommensurate Pb phase with 4 3 ML coverage by means of spin-resolved photoemission spectroscopy. Our results fully agree with density functional theory calculations done by Ren et al. [Phys. Rev. B 94, 075436 (2016)]. We observe a local Zeeman-type splitting of a fully occupied and spin-polarized surface band at the K √ 3 points. The growth of this densely packed Pb structure results in the formation of imbalanced rotational domains, which triggered the detection of C 3v symmetry forbidden spin components for surface states around the Fermi energy. Moreover, the Fermi surface of the metallic surface state of this phase is Rashba spin split and revealed a pronounced warping. However, the 2D nesting vectors are incommensurate with the atomic structure, thus keeping this system rather immune against charge density wave formation and possibly enabling a superconducting behavior.

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Section: A Characterization Of the Cemmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Spin-resolved band structure of a densely packed Pb monolayer on Si(111)

et al. 2017

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“…and Tl=Ge(111) 1 × 1 [26][27][28] one-monolayer (ML) systems have attracted the greatest attention, in particular, since the origin of the giant spin splitting in these systems is not confined by the pure Rashba effect. One can mention also Sb=Si(111…”

Section: Surface Rashba Effectmentioning

confidence: 99%

One-atom-layer compounds on silicon and germanium

Грузнев

Зотов

Саранин

2017

Jpn. J. Appl. Phys.

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Two-dimensional (2D) compounds having one-atomic-layer thickness represent a novel class of low-dimensional materials with potentially advanced properties. In the present progress review, we overview the recent results on the 2D compounds of metallic adsorbates on Si(111) and Ge(111) surfaces. The main attention is focused on their contribution to the very modern subjects of the surface science, namely surface Rashba effect and surface superconductivity. The possible prospects of studying 2D compounds are briefly discussed.

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“…The Rashba effect [1,2] which resides in spin splitting of two-dimensional electronic states due to space-inversion asymmetry, has been found to be especially pronounced in heavy-metal monolayers on silicon and germanium. A large Rashba-type spin splitting has been detected in Tl/Si(1 1 1) [3][4][5][6][7][8][9], Bi/Si(1 1 1) [8,[10][11][12], Tl/Ge(1 1 1) [13,14], Bi/Ge(1 1 1) [15,16], Pb/Ge(1 1 1) [17,18], and Au/Ge(1 1 1) [19][20][21][22] systems. Superconductivity of atom-layer-thick films was discovered in metal/silicon systems, In/Si(1 1 1) and Pb/Si(1 1 1) [23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

2D Tl–Pb compounds on Ge(1 1 1) surface: atomic arrangement and electronic band structure

Грузнев

Bondarenko

Tupchaya

et al. 2016

J. Phys.: Condens. Matter

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Structural transformations and evolution of the electron band structure in the (Tl, Pb)/Ge(1 1 1) system have been studied using low-energy electron diffraction, scanning tunneling microscopy, angle-resolved photoelectron spectroscopy and density functional theory calculations. The two 2D Tl-Pb compounds on Ge(1 1 1), [Formula: see text]-(Tl, Pb) and [Formula: see text]-(Tl, Pb), have been found and their composition, atomic arrangement and electron properties has been characterized. The (Tl, Pb)/Ge(1 1 1)[Formula: see text] compound is almost identical to the alike (Tl, Pb)/Si(1 1 1)[Formula: see text] system from the viewpoint of its atomic structure and electronic properties. They contain 1.0 ML of Tl atoms arranged into a honeycomb network of chained trimers and 1/3 ML of Pb atoms occupying the centers of the honeycomb units. The (Tl, Pb)/Ge(1 1 1)[Formula: see text] compound contains six Tl atoms and seven Pb atoms per [Formula: see text] unit cell (i.e. ∼0.67 ML Tl and ∼0.78 ML Pb). Its atomic structure can be visualized as consisting of Pb hexagons surrounded by Tl trimers. The (Tl, Pb)/Ge(1 1 1)[Formula: see text] and (Tl, Pb)/Ge(1 1 1)[Formula: see text] compounds are metallic and their band structures contain spin-split surface-state bands. By analogy with the (Tl, Pb)/Si(1 1 1)[Formula: see text], these (Tl, Pb)/Ge(1 1 1) compounds are believed to be promising objects for prospective studies of superconductivity in one-atom-layer systems.

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Effects of orbital composition in a pair of spin-orbit-split surface bands at Tl/Ge(111)

Cited by 12 publications

References 37 publications

Spin-resolved band structure of a densely packed Pb monolayer on Si(111)

Spin-resolved band structure of a densely packed Pb monolayer on Si(111)

One-atom-layer compounds on silicon and germanium

2D Tl–Pb compounds on Ge(1 1 1) surface: atomic arrangement and electronic band structure

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