Spin texture with a twist in momentum space for Tl/Si(111)

Stolwijk, SebastianÂ D.; Sakamoto, Kazuyuki; Schmidt, Anke B.; Krüger, Peter; Donath, M.

doi:10.1103/physrevb.91.245420

Cited by 23 publications

(11 citation statements)

References 28 publications

(41 reference statements)

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“…The ARPES data are presented in the form of the spectra along the Γ-K direction and Fermi surface maps as shown in figures 3(b) and (c). In agreement with the previously reported data [37][38][39][40][41][42][43], the initial × 1 1-Tl surface shows up basically as a semiconductor if one does not take into account the shallow pockets around the K points whose electron filling is associated with extra Tl atoms on the × 1 1-Tl surface [39] in the form of specific surface defects [33]. With formation of the × 6 6 Tl double layer, a distinct metallic surface-state band develops.…”

Section: Tl Double Layer Formationsupporting

confidence: 90%

Superconductivity in thallium double atomic layer and transition into an insulating phase intermediated by a quantum metal state

et al. 2017

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We report on the first observation of superconductivity in a double atomic layer of Tl on Si(1 1 1) using in situ electrical resistivity measurements in ultrahigh vacuum. The structure of the Tl bilayer was characterized by a set of techniques, including scanning tunneling microscopy, electron diffraction and photoemission spectroscopy, which confirmed the metastability and metallic nature of the Tl bilayer. The epitaxial growth of atomically thin 'soft' metallic film over the entire surface of substrate enabled us to find a macroscopic superconducting transition at 0.96 K, accompanied by thermal and quantum fluctuations of order parameter. The system also demonstrates a perpendicular-magnetic-field-induced superconductor-insulator transition, together with an intermediate metallic state. We have found that the magnetoresitivity at the lowest temperature is consistent with the Bose metal picture, which is a consequence of strong quantum fluctuations.

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Section: Tl Double Layer Formationsupporting

confidence: 90%

Superconductivity in thallium double atomic layer and transition into an insulating phase intermediated by a quantum metal state

et al. 2017

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“…Remarkably, in Refs. [39,40] not only an anisotropic dispersion of a surface state of the Tl/Si(111) system was found but in addition the spin texture was outlined to be anisotropic. Recently, the importance of a low surface symmetry that stabilizes an antiskyrmionic magnetic structure on 2 ML Fe on W(110) through the anisotropic Dzyaloshinskii-Moriya interaction was also emphasized [41].…”

Section: Introductionmentioning

confidence: 92%

Creating anisotropic spin-split surface states in momentum space by molecular adsorption

et al. 2017

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In this ab initio study we demonstrate that molecular adsorption on a surface Rashba system can be used to modulate the surface electronic structure in different momentum space directions, i.e., to create anisotropic spin splittings in k space. This effect is rooted in the asymmetric adsorption of the molecules on the surface in a hollow site which breaks the surface symmetry. More specifically, we demonstrate that the physisorbed NH 3 has a small influence on the surface Rashba states and only gives rise to variations of the surface state Rashba parameters up to a factor of 1.4 over the surface Brillouin zone. In contrast, the chemisorption of BH 3 leads to variations of the Rashba parameter by more than a factor of 2.5. Consequently, the anisotropy of the Rashba-split-surface states induced by molecular adsorption also gives rise to a modulation of the surface state spin texture, i.e., the out-of-plane spin polarization varies along different k directions by up to 70% for the occupied states. This offers the possibility to change the spin direction from in-plane to predominantly out-of-plane by modifying the electronic momentum by 90°.

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“…Current SPIPES-dedicated sources either focus only on the surface component of the polarization or they tune the spin polarization perpendicular to the surface P ⊥ by rotating the sample around an axis at the surface. These setups allow to study a whole variety of systems 16,[18][19][20][21][22][23][24][25] .…”

Section: Introductionmentioning

confidence: 99%

Spin- and angle-resolved inverse photoemission setup with spin orientation independent from electron incidence angle

Campos¹,

Duret²,

Cabaret³

et al. 2021

Preprint

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A new spin-and angle-resolved inverse photoemission setup with a low-energy (5-100 eV) electron source is presented. The spin-polarized electron source, with a compact design, can decouple the spin polarization vector from the electron beam propagation vector, allowing to explore any spin orientation at any wavevector in angle-resolved inverse photoemission. The beam polarization can be tuned to any preferred direction with a shielded electron-optical system, preserving the parallel beam condition. We demonstrate the performances of the setup by measurements on Cu(001), Au(111) and ultrathin Co films. We estimate at room temperature the energy resolution of the overall system to be ∼ 170 meV from kT e f f of a Cu(001) Fermi level, allowing a direct comparison to photoemission. The spin-resolved operation of the setup has been demonstrated by measuring the Rashba splitting of the Au(111) Shockley surface state. The effective polarization of the electron beam is P = 30 ± 3 % and the wavevector resolution is ∆k F 0.06 Å −1 . Measurements on ultrathin Co films with out-of-plane magnetization and on Au(111) surface state demonstrate how the electron beam polarization direction can be tuned in the three spatial dimensions. In both systems the maximum of the spin asymmetry is reached when the electron beam polarization is aligned with the out-of-plane magnetization of the Co film or the in-plane spin-polarization of Au(111) surface state.

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Spin texture with a twist in momentum space for Tl/Si(111)

Cited by 23 publications

References 28 publications

Superconductivity in thallium double atomic layer and transition into an insulating phase intermediated by a quantum metal state

Superconductivity in thallium double atomic layer and transition into an insulating phase intermediated by a quantum metal state

Creating anisotropic spin-split surface states in momentum space by molecular adsorption

Spin- and angle-resolved inverse photoemission setup with spin orientation independent from electron incidence angle

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