Symmetry induced peculiar Rashba effect on thallium adsorbed Si(1 1 1) surfaces

Sakamoto, Kazuyuki; Oda, Tetsuji; Kimura, Akio; Takeichi, Yasuo; Fujii, Jun; Uhrberg, R. I. G.; Donath, M.; Yeom, Han Woong

doi:10.1016/j.elspec.2014.09.008

Cited by 6 publications

(4 citation statements)

References 35 publications

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“…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. A possible combination of RB-and Zeemantype spin splitting in a 2D system has also been discussed in theory [28].…”

Section: Introductionmentioning

confidence: 97%

“…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: 99%

“…Compared to the Pb-adatom density of 1.04×10 15 cm −2 ( 4 3 ML phase), every Pb atom within the ( √ 3× √ 3) unit cell donates 1 4 electron into the metallic S1 state. Similarly to the Tl/Si(111) system [26] we assume that only the Pb6p 2 electrons are involved in the bonding formation. The 6s 2 electrons are energetically 6 eV below the p orbitals and do not contribute to the band structure around the Fermi level, thus, eight p electrons per ( √ 3× √ 3) unit cell are participating in the bond formation.…”

Section: A Characterization Of the Cemmentioning

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: Introductionmentioning

confidence: 97%

Section: A Characterization Of the Cemmentioning

confidence: 99%

Section: A Characterization Of the Cemmentioning

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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“…The current interest in this research field is strongly focused on the atomic layers built of heavy elements with a strong spin–orbit coupling (SOC). In such 2D systems, the space-inversion symmetry is broken due to structural inversion asymmetry of the layer-substrate interface, and the SOC leads to the lifted spin degeneracy and occurrence of the spin-split surface-state bands, as predicted by the Rashba–Bychkov model. , Indeed, considerable (even “giant”) Rashba-type spin splitting has been experimentally detected in many systems, e.g., in the one-atomic layers of Tl − and Bi ,− on Si(111), in Pb , and Au − layers on Ge(111), as well as in numerous 2D compounds containing a metal with a strong SOC and another suitable metal on Si(111) and Ge(111), , in particular in the recently found (Tl, Au)/Si(111) compound …”

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confidence: 99%

Weak Antilocalization at the Atomic-Scale Limit of Metal Film Thickness

et al. 2018

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Creation of the 2D metallic layers with the thickness as small as a few atomic layers and investigation of their properties are interesting and challenging tasks of the modern condensed-matter physics. One of the possible ways to grow such layers resides in the synthesis of the so-called metal-induced reconstructions on silicon (i.e., silicon substrates covered with ordered metal films of monolayer or submonolayer thickness). The 2D Au–Tl compound on Si(111) surface having periodicity belongs to the family of the reconstructions incorporating heavy-metal atoms with a strong spin–orbit coupling (SOC). In such systems, strong SOC results in the spin-splitting of surface-state bands due to the Rashba effect, the occurrence of which was experimentally proved. Another remarkable consequence of a strong SOC that manifests itself in the transport properties is a weak antilocalization (WAL) effect, which has never been explored in the metal layers of atomic thickness. In the present study, the transport and magnetotransport properties of the 2D Au–Tl compound on Si(111) surface were investigated at low temperatures down to ∼2.0 K. The compound was proved to show behavior of the 2D nearly free electron gas system with metallic conduction, as indicated by Ioffe–Regel criterion. It demonstrates the WAL effect which is interpreted in the framework of Hikami–Larkin–Nagaoka theory, and possible mechanisms of the electron decoherence are discussed. Bearing in mind that besides the (Au, Tl)/Si(111) system, there are many other ordered atomic-layer metal films on silicon differing by composition, structure, strength of SOC, and spin texture, which provide a promising area for prospective investigations of the WAL effect at the atomic-scale limit when the film thickness is less than the electron wavelength.

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Giant Rashba spin splitting induced by heavy element adsorption at germanene

Szary

2019

FlatChem

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Symmetry induced peculiar Rashba effect on thallium adsorbed Si(1 1 1) surfaces

Cited by 6 publications

References 35 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)

Weak Antilocalization at the Atomic-Scale Limit of Metal Film Thickness

Giant Rashba spin splitting induced by heavy element adsorption at germanene

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