Nontrivial evolution of the Sb(1 1 1) electronic and atomic structure after ion irradiation

Chekmazov, Sergey V.; Smirnov, A.A.; Ksenz, A.S.; Bozhko, S. I.; Ionov, A. N.; Protasova, S. G.; Kapustin, A. A.; Vilkov, O. Yu.; Levchenko, E. A.

doi:10.1016/j.matlet.2018.12.074

Cited by 2 publications

(5 citation statements)

References 7 publications

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“…Further sputtering of the surface did not result in a remarkable increase in the UPS spectrum near the Fermi level. This observation is in contrast with the study of Sb(111), 53 which demonstrated that the feature near the Fermi level edge becomes more pronounced with increasing etching duration, corresponding to the more defective surface. In the case of Bi(111), one can conclude that 2 min is sufficient to saturate the surface with defects and that this saturation limit is related to the recrystallization process.…”

Section: Resultscontrasting

confidence: 99%

“…The present findings indicate that argon sputtering produces these 2D defects (monolayer steps and nanoislands), increasing the DOS near the Fermi level as indicated by UPS measurements in Figure 3 e. Similarly to the case of Sb(111), 53 the formation of monolayer steps is a result of a local violation to the conditions for the Peierls transition. The Peierls transition is an out-of-plane distortion to the periodic lattice of Bi(111), which results in the formation of a layered structure with alternating covalent and van der Waals bonds.…”

Section: Resultssupporting

confidence: 64%

“…Evidently, the surface of the Bi crystal recrystallizes following the disordering induced by Ar + sputtering. In an effort to prevent the recrystallization process, the experiment was repeated at 110 K. By cooling the crystal, we aimed to retain the amorphous structure of the surface, as has been demonstrated in the case of Sb(111) . In that work, Chekmazov et al did not observe a LEED pattern after Ar + bombardment at low temperature (110 K); however, a diffraction pattern appeared as the temperature was increased to 300 K. The presence of a LEED pattern following Ar + sputtering at for 12 min at 110 K indicates that the surface, once again, possesses sufficient energy to regain crystallinity.…”

Section: Resultsmentioning

confidence: 99%

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Surface Modification and Subsequent Fermi Density Enhancement of Bi(111)

et al. 2021

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Defects introduced to the surface of Bi(111) break the translational symmetry and modify the surface states locally. We present a theoretical and experimental study of the 2D defects on the surface of Bi(111) and the states that they induce. Bi crystals cleaved in ultrahigh vacuum (UHV) at low temperature (110 K) and the resulting ion-etched surface are investigated by low-energy electron diffraction (LEED), X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy (UPS), and scanning tunneling microscopy (STM) as well as spectroscopy (STS) techniques in combination with density functional theory (DFT) calculations. STS measurements of cleaved Bi(111) reveal that a commonly observed bilayer step edge has a lower density of states (DOS) around the Fermi level as compared to the atomic-flat terrace. Following ion bombardment, the Bi(111) surface reveals anomalous behavior at both 110 and 300 K: Surface periodicity is observed by LEED, and a significant increase in the number of bilayer step edges and energetically unfavorable monolayer steps is observed by STM. It is suggested that the newly exposed monolayer steps and the type A bilayer step edges result in an increase to the surface Fermi density as evidenced by UPS measurements and the Kohn–Sham DOS. These states appear to be thermodynamically stable under UHV conditions.

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Section: Resultscontrasting

confidence: 99%

Section: Resultssupporting

confidence: 64%

Section: Resultsmentioning

confidence: 99%

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Surface Modification and Subsequent Fermi Density Enhancement of Bi(111)

et al. 2021

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“…Previously we have observed monolayer steps on Sb(111) and Bi(111) after ion bombardment of the cleaved surface (see SM and Refs. 43 , 44 ). The monolayer step height measured by STM is extremely hard to estimate.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, if a surface reconstruction occurs where covalent bonds are cleaved, it will likely not be observed by area averaging LEED. However, a separate study conducted by the authors examining ion bombarded Sb(111) surface is worth noting 43 . The ion-bombarded surface contains a large coverage of areas cleaved by covalent bonds.…”

Section: Resultsmentioning

confidence: 99%

The topological soliton in Peierls semimetal Sb

Chekmazov,

Ksenz,

Ionov

et al. 2024

Sci Rep

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Sb is a three-dimensional Peierls insulator. The Peierls instability gives rise to doubling of the translational period along the [111] direction and alternating van der Waals and covalent bonding between (111) atomic planes. At the (111) surface of Sb, the Peierls condition is violated, which in theory can give rise to properties differing from the bulk. The atomic and electronic structure of the (111) surface of Sb have been simulated by density functional theory calculations. We have considered the two possible (111) surfaces, containing van der Waals dangling bonds or containing covalent dangling bonds. In the models, the surfaces are infinite and the structure is defect free. Structural optimization of the model containing covalent dangling bonds results in strong deformation, which is well described by a topological soliton within the Su–Schrieffer–Heeger model centered about 25 Å below the surface. The electronic states associated with the soliton see an increase in the density of states (DOS) at the Fermi level by around an order of magnitude at the soliton center. Scanning tunneling microscopy and spectroscopy (STM/STS) measurements reveal two distinct surface regions, indicating that there are different surface regions cleaving van der Waals and covalent bonds. The DFT is in good agreement with the STM/STS experiments.

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Nontrivial evolution of the Sb(1 1 1) electronic and atomic structure after ion irradiation

Cited by 2 publications

References 7 publications

Surface Modification and Subsequent Fermi Density Enhancement of Bi(111)

Surface Modification and Subsequent Fermi Density Enhancement of Bi(111)

The topological soliton in Peierls semimetal Sb

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Nontrivial evolution of the Sb(1 1 1) electronic and atomic structure after ion irradiation

Cited by 2 publications

References 7 publications

Surface Modification and Subsequent Fermi Density Enhancement of Bi(111)

Surface Modification and Subsequent Fermi Density Enhancement of Bi(111)

The topological soliton in Peierls semimetal Sb

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Nontrivial evolution of the Sb(1 1 1) electronic and atomic structure after ion irradiation