Experimental evidence for two-dimensional states localized in subsurface region of Ge(1 1 1)

Yaji, Koichiro; Ohtsubo, Yoshiyuki; Hatta, S.; Okuyama, Hiroshi; Yukawa, Ryu; Matsuda, Iwao; Fèvre, P. Le; Bertran, F.; Taleb‐Ibrahimi, A.; Kakizaki, Akito; Aruga, Tetsuya

doi:10.1016/j.elspec.2014.09.005

Cited by 11 publications

(10 citation statements)

References 18 publications

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“…The energy dependence of λ can be discussed in terms of the electron density of states participating the hole relaxation [31]. Since the bulk valence band maximum on the Pb-β √ 3/Ge(111) surface is located at 0.05-0.1 eV below E F [13,15], the bulk density of states starts to increase at this binding energy, which is consistent with the observed energy dependence of λ. The λ value at binding energies below 40 meV was averaged, which yielded 0.47 ± 0.10 for ss 1 and 0.06 +0.10 −0.06 for ss 2 .…”

Section: Resultssupporting

confidence: 70%

“…1(b). Although a small Fermi surface due to the subsurface 2D state (ss sub ) is present near¯ [15] as schematically shown in Fig. 1(b), the contribution of the subsurface state to electrical conduction should be only a few percent of that of the Pb-derived surface states because of a much smaller Fermi contour and group velocity.…”

Section: Methodsmentioning

confidence: 98%

“…The Pb-β √ 3 monolayer was prepared on Ge(111) substrates (n type, [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] cm) with a dimension of 10 × 3.5 × 0.5 mm 3 as prescribed elsewhere [13,14]. The atomic * hatta@kuchem.kyoto-u.ac.jp † aruga@kuchem.kyoto-u.ac.jp structure of Pb-β √ 3/Ge(111) is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

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Anomalous electrical conduction in a monatomic Pb layer on Ge(111)

et al. 2014

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We studied electrical transport through a Pb monolayer on Ge(111), which has a metallic surface state with a large Rashba spin splitting. The Pb monolayer was found to be metallic down to 9 K. The macroscopic sheet conductivity was 10.2 ± 1.0 mS/ at 9 K, which is much higher than those of other metallic monolayers. We found that the microscopic step conductivity is two orders of magnitude larger than those in other metallic monolayers, being the main cause of the high macroscopic conductivity. The transport electron-phonon (e-ph) coupling constant obtained by a temperature-dependent conductance measurement is 0.16 ± 0.03, indicating weak e-ph coupling compared to bulk Pb (1.1-1.5). This result is supported by temperature-dependent angle-resolved photoelectron spectroscopy.

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Section: Resultssupporting

confidence: 70%

Section: Methodsmentioning

confidence: 98%

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Anomalous electrical conduction in a monatomic Pb layer on Ge(111)

et al. 2014

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“…1(c)] [45], and Ge(111)- Fig. 1(e)] [46]. Since Br is in the fourth row, the same as Ge, in the periodic table, it is clear that the heavy elements that cover the surface are not essential to the spin polarization observed on these surfaces.…”

Section: γ Surface States Derived From Subsurface Ge Orbitalsmentioning

confidence: 99%

Different types of Rashba spin-split surface states on Ge(1 1 1)

Aruga

2015

Journal of Electron Spectroscopy and Related Phenomena

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In this review article, after a brief account of the early history of the study of the surface Rashba effect is given, a survey is made on an exploration of the Rashba spin-split surface states on a Ge(111) surface. First, the studies on Pb/Ge(111) is shown, which was the first surface with Rashba spin-split metallic surface state on a semiconductor established by experiments and first-principles calculation. Second example is Tl/Ge(111), which exhibits valley-like conduction band minimum at theK points in the surface Brilouin zone. Due to the symmetry of this surface, spins at the bottom of the valleys are completely polarized parallel to the surface normal. In these two cases, the spin splitting is due to the strong spin-orbit interaction (SOI) in the close proximity to the heavy nuclei at the surfaces. On the other hand, the third example demonstrates that a significant Rashba spin splitting is possible also by SOI at the nuclei of the subsurface Ge atoms. This type of spin-split surface states are believed to be ubiquitous on any types of Ge surfaces as well as at the interfaces between Ge and other materials. A personal view of coming developments in this field is given.

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“…Although the intrinsic Ge Rashba spin-splitting of the subsurface states is not strong enough to target room temperature applications, it can be greatly enhanced at the interface between Ge(111) and metals [19][20][21][22] . Hence, beyond providing a way to manipulate the electron spin state, these Rashba states could also be used to generate and detect spin currents in germanium at room temperature, which represents an interesting concept in the field of semiconductor spintronics.…”

Section: Introductionmentioning

confidence: 99%

Large Rashba unidirectional magnetoresistance in the Fe/Ge(111) interface states

Guillet,

Zucchetti,

Marty

et al. 2020

Preprint

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Experimental evidence for two-dimensional states localized in subsurface region of Ge(1 1 1)

Cited by 11 publications

References 18 publications

Anomalous electrical conduction in a monatomic Pb layer on Ge(111)

Anomalous electrical conduction in a monatomic Pb layer on Ge(111)

Different types of Rashba spin-split surface states on Ge(1 1 1)

Large Rashba unidirectional magnetoresistance in the Fe/Ge(111) interface states

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