Mode conversion and long-lived vibrational modes in lead monolayers on silicon (111) after femtosecond laser excitation: A molecular dynamics simulation

Sakong, Sung; Kratzer, Peter; Wall, Simone; Kalus, Annika; Hoegen, M. Horn‐von

doi:10.1103/physrevb.88.115419

Cited by 16 publications

(24 citation statements)

References 31 publications

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“…In the following, we will first discuss the surface bands and their spin character. These findings will be correlated with recent DFT calculations [12,13].…”

Section: B Constant Energy Map Of the Sic Phasesupporting

confidence: 74%

“…Albeit atomic details about the structure are intensively studied, less attention was paid to the electronic band structure. Moreover, the interpretation of former angle-resolved photoemission spectroscopy (ARPES) band structure measurements disagree with recent calculations [4,12,13].…”

Section: Introductioncontrasting

confidence: 77%

“…High-resolution STM images of both geometries are shown in Figs. 1(c) and 1(d), consistent with density functional theory (DFT) calculations [12,36]. These geometries, where the central Pb atom (orange colored) is either located above the hollow site of the Si honeycomb of the topmost Si bilayer or on top of the Si atom of the second Si layer, are energetically almost identical [37].…”

Section: A Atomic Structure Of the Sic Phasesupporting

confidence: 67%

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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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“…In the following, we will first discuss the surface bands and their spin character. These findings will be correlated with recent DFT calculations [12,13].…”

Section: B Constant Energy Map Of the Sic Phasesupporting

confidence: 74%

Section: Introductioncontrasting

confidence: 77%

Section: A Atomic Structure Of the Sic Phasesupporting

confidence: 67%

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

et al. 2017

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“…Figure 8 summarizes our experimental findings on the occupied and unoccupied electronic structure and indicates the near-resonant excitation pathways of states A and B. The relevant initial state at E − E F = −0.43 eV is the Si valence-band maximum, and it was also observed in DFT calculations on the Pb/Si(111) system [42] as well as in experimental studies on Au/Si(557) [31] and Au/Si(553) [32].…”

Section: Discussionmentioning

confidence: 88%

“…To support the interpretation of the 2PPE spectra, we therefore performed DFT calculation of a Si(111) slab covered with 4/3 ML Pb in the above reconstruction. The details of the calculation were similar to our previous work [42]. The starting geometry corresponded to the T4 structural model in Ref.…”

Section: Density-functional-theory Calculationsmentioning

confidence: 99%

Unoccupied electronic structure and momentum-dependent scattering dynamics in Pb/Si(557) nanowire arrays

et al. 2015

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The unoccupied electronic structure of quasi-one-dimensional reconstructions of Pb atoms on a Si(557) surface is investigated by means of femtosecond time-and angle-resolved two-photon photoemission. Two distinct unoccupied electronic states are observed at E − E F = 3.55 and 3.30 eV, respectively. Density functional theory calculations reveal that these states are spatially located predominantly on the lead wires and that they are energetically degenerated with an energy window of reduced electronic density of states in Si. We further find momentum-averaged lifetimes of 24 and 35 fs of these two states, respectively. The photoemission yield and the population dynamics depend on the electron momentum component perpendicular to the steps of the Si substrate, and the momentum-dependent dynamics cannot be described by means of rate equations. We conclude that momentum-and direction-dependent dephasing of the electronic excitations, likely caused by elastic scattering at the step edges on the vicinal surface, modifies the excited-state population dynamics in this system.

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