Quantum-well states with image state character for Pb overlayers on Cu(111)

Zugarramurdi, A.; Zabala, Nerea; Silkin, Viatcheslav M.; Chulkov, Eugene V.; Borisov, Andrei G.

doi:10.1103/physrevb.86.075434

Cited by 7 publications

(6 citation statements)

References 78 publications

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“…In the following we substantiate that the interband SO coupling, which explains (i) the modification of the dispersion of the α-band and (ii) the sign reversal in the momentum splitting, is independent of the supporting substrate by studying QWS in Pb/Cu(111) 35,48,[57][58][59][60] . Figure 7(a) shows the electronic structure of 8 ML Pb The results and our analysis are displayed in Fig.…”

Section: Interband Spin-orbit Coupling In Pb Qwsmentioning

confidence: 54%

“…In the following we substantiate that the interband SO coupling, which explains (i) the modification of the dispersion of the α-band and (ii) the sign reversal in the momentum splitting, is independent of the supporting substrate by studying QWS in Pb/Cu(111) [35,48,[59][60][61][62]. structure of Pb/Bi/Si the effective mass of the α-band is significantly reduced from m = 3.2m e to 0.86m e , and the pronounced change in the dispersion is situated above the Fermi level.…”

Section: Pb/cu(111)mentioning

confidence: 55%

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Interband spin–orbit coupling between anti-parallel spin states in Pb quantum well states

et al. 2013

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Using spin and angle-resolved photoemission spectroscopy we investigate a momentum region in Pb quantum well states on Si(111) where hybridization between Rashba-split bands alters the band structure significantly. Starting from the Rashba regime where the dispersion of the quasi-free twodimensional electron gas is well described by two spin-polarized parabolas, we find a breakdown of the Rashba behavior which manifests itself (i) in a spin splitting that is no longer proportional to the in-plane momentum and (ii) in a reversal of the sign of the momentum splitting. Our experimental findings are well explained by including interband spin-orbit coupling that mixes Rashbasplit states with anti-parallel rather than parallel spins. Similar results for Pb/Cu(111) reveal that the proposed hybridization scenario is independent on the supporting substrate.

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Section: Interband Spin-orbit Coupling In Pb Qwsmentioning

confidence: 54%

“…In the following we substantiate that the interband SO coupling, which explains (i) the modification of the dispersion of the α-band and (ii) the sign reversal in the momentum splitting, is independent of the supporting substrate by studying QWS in Pb/Cu(111) [35,48,[59][60][61][62]. structure of Pb/Bi/Si the effective mass of the α-band is significantly reduced from m = 3.2m e to 0.86m e , and the pronounced change in the dispersion is situated above the Fermi level.…”

Section: Pb/cu(111)mentioning

confidence: 55%

Interband spin–orbit coupling between anti-parallel spin states in Pb quantum well states

et al. 2013

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“…The negative value of a is a consequence of the two-dimensional character of graphene in contrast to a surface terminating a bulk metal with three-dimensional periodicity, where 0 a 0.5. However, a < 0 has been observed in case of metallic quantum-well structures [27,28] and predicted for freestanding graphene [5,13].…”

Section: Resultsmentioning

confidence: 94%

Two-photon photoemission from image-potential states of epitaxial graphene

et al. 2015

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Using angle-and time-resolved two-photon photoelectron spectroscopy we observe a single series of image-potential states of graphene on monolayer (MLG) and bilayer graphene (BLG) on SiC(0001). The first image-potential state on MLG (BLG) has a binding energy of 0.93 eV (0.84 eV). Lifetimes of the first three image-potential states of MLG are 9, 44 and 110 fs. On hydrogen-intercalated, quasifreestanding graphene no unoccupied states are observed. We attribute this to the absence of occupied initial states for direct transitions into image-potential states at photon energies below the work function used in two-photon photoemission. The work function varies between 4.14 and 4.79 eV, but the vacuum level stays ∼4.5 eV above the Dirac point for all surfaces studied. This finding suggests that direct excitation of image-potential states cannot be achieved by doping and the electron dynamics for free-standing graphene is not accessible by two-photon photoemission using photon energies below the work function.

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“…It was demonstrated that many properties of thin films may depend of their thickness due to modulation of the density of states at the Fermi level. This effect was mainly investigated in films consisting of simple metals [ 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 ].…”

Section: Introductionmentioning

confidence: 99%

Formation of Surface and Quantum-Well States in Ultra Thin Pt Films on the Au(111) Surface

et al. 2017

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The electronic structure of the Pt/Au(111) heterostructures with a number of Pt monolayers n ranging from one to three is studied in the density-functional-theory framework. The calculations demonstrate that the deposition of the Pt atomic thin films on gold substrate results in strong modifications of the electronic structure at the surface. In particular, the Au(111) s-p-type Shockley surface state becomes completely unoccupied at deposition of any number of Pt monolayers. The Pt adlayer generates numerous quantum-well states in various energy gaps of Au(111) with strong spatial confinement at the surface. As a result, strong enhancement in the local density of state at the surface Pt atomic layer in comparison with clean Pt surface is obtained. The excess in the density of states has maximal magnitude in the case of one monolayer Pt adlayer and gradually reduces with increasing number of Pt atomic layers. The spin–orbit coupling produces strong modification of the energy dispersion of the electronic states generated by the Pt adlayer and gives rise to certain quantum states with a characteristic Dirac-cone shape.

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Quantum-well states with image state character for Pb overlayers on Cu(111)

Cited by 7 publications

References 78 publications

Interband spin–orbit coupling between anti-parallel spin states in Pb quantum well states

Interband spin–orbit coupling between anti-parallel spin states in Pb quantum well states

Two-photon photoemission from image-potential states of epitaxial graphene

Formation of Surface and Quantum-Well States in Ultra Thin Pt Films on the Au(111) Surface

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