Lateral confinement of surface states on stepped Cu(111)

Sánchez, O.; García, J. M.; Segovia, P.; Álvarez, J.; Parga, Amadeo L. Vázquez de; Ortega, J. E.; Prietsch, M.; Miranda, Rodolfo

doi:10.1103/physrevb.52.7894

Cited by 77 publications

(71 citation statements)

References 11 publications

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“…Angle-resolved photoemission data, on the other hand, produce E͑k͒ band dispersions that lead to the picture in Fig. 1(a) [8][9][10]. In addition, backfolding of the surface state band by the reciprocal vector of the step superlattice has been reported and explained in a model consistent with Fig.…”

Section: (Received 2 November 1999)supporting

confidence: 57%

“…In addition, as we will show, the modulation by the bulk lattice perpendicular to the surface plays an important role. A good model system for investigating the behavior of these wave functions is a noble metal surface with a free-electron-like surface state, such as Cu(111) [5][6][7][8][9][10]. It has been shown that regular superlattices of straight, monoatomic steps can be prepared on vicinal Cu(111) at 300 K [10].…”

Section: (Received 2 November 1999)mentioning

confidence: 99%

“…High photoemission intensity is shown in the dark areas. Parabolic fits (thick lines) show that the bottom of the band is shifted up from the value of the flat (111) surface (20.4 eV [11]) to 20.35 and 20.3 eV for 5 ± and 9 ± miscut, reflecting the repulsive effect of the step barrier [10]. But the most remarkable feature, compared to flat Cu(111), is the systematic shift of the band minimum ͑u min ͒ away from normal emission.…”

Section: (Received 2 November 1999)mentioning

confidence: 99%

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Electron Wave Function at a Vicinal Surface: Switch from Terrace to Step Modulation

Ortega

Speller

et al. 2000

Phys. Rev. Lett.

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The Cu(111) surface state has been mapped for vicinal surfaces with variable step densities by angleresolved photoemission. Using tunable synchrotron radiation to vary the k dependence perpendicular to the surface, as well as the k k dependence, we find a switch between two qualitatively different regimes at a miscut of 7 ± (17 Å terrace width). For larger miscut angles the step modulation of the wave function dominates, and for smaller miscut angles the terrace modulation dominates. These observations resolve an apparent inconsistency between prior photoemission and STM results.

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Section: (Received 2 November 1999)supporting

confidence: 57%

Section: (Received 2 November 1999)mentioning

confidence: 99%

Section: (Received 2 November 1999)mentioning

confidence: 99%

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Electron Wave Function at a Vicinal Surface: Switch from Terrace to Step Modulation

Ortega

Speller

et al. 2000

Phys. Rev. Lett.

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“…Following the analysis of Ref. 15, we deduce a repulsive barrier of ϳ1.4 eV Å Ϫ1 and a transmission probability ͉T͉ϭ0.84 at monatomic steps in Au͑322͒. These values are similar to those found in Cu͑111͒ vicinals.…”

supporting

confidence: 61%

“…Assuming a one-dimensional Kronig-Penney model with ␦-function-like step potentials, the strength of the step barrier can be estimated from the upwards shift of the superlattice band with respect to the flat surface band. 15 Although the correct reference is the energy of the infinite fcc-packed terrace we can use the surface state energy of Au͑111͒, since its herringbone reconstruction only results in minor energy changes. 10 The surface state of Au͑111͒ has been measured separately under the same experimental conditions, giving E F ϪE 0 ϭ Ϫ0.46 eV.…”

mentioning

confidence: 99%

One-dimensional versus two-dimensional surface states on steppedAu(111)

et al. 2002

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Surface states at vicinal Au͑788͒ and Au͑322͒ have been investigated with angle-resolved photoemission and synchrotron radiation. Both surfaces are characterized by highly regular one-dimensional step arrays with relatively wide ͑ϳ3.9 Å͒ or narrow ͑ϳ1.3 Å͒ terraces in Au͑788͒ and Au͑322͒, respectively. Depending on the terrace size we observe that surface electrons behave in a completely different way. In Au͑788͒ terraces become one-dimensional, lateral quantum wells that confine surface electrons between adjacent steps. In Au͑322͒ surface electrons propagate across the step array forming two-dimensional superlattice bands. By tuning photon energy and angle we probe fundamental properties of the electron wave functions in both cases.

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Dirac Fermions in Blue Phosphorene Monolayer

Kaddar

Zhang

Enriquez

et al. 2023

Adv Funct Materials

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2D materials beyond graphene and in particular 2D semiconductors have raised interest due to their unprecedented electronic properties, such as high carrier mobility or tunable bandgap. Blue phosphorene is an allotrope of black phosphorene that resembles graphene as it presents a honeycomb structure. However, it is known to have semiconductor character and the crucial point is to determine whether this hexagonal phase of phosphorene presents Dirac fermions as in graphene. Here, the first compelling experimental evidence of Dirac fermions in blue phosphorene layer grown on Cu(111) surface is presented. The results highlight the formation of a highly ordered blue phosphorene sheet with a clear Dirac cone at the high symmetry points of the Brillouin Zone. The charge carriers behave as massless relativistic particles. Therefore, all the expectations held for graphene, such as high‐speed electronic devices based on ballistic transport at room temperature, may also be applied to blue phosphorene.

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Lateral confinement of surface states on stepped Cu(111)

Cited by 77 publications

References 11 publications

Electron Wave Function at a Vicinal Surface: Switch from Terrace to Step Modulation

Electron Wave Function at a Vicinal Surface: Switch from Terrace to Step Modulation

One-dimensional versus two-dimensional surface states on steppedAu(111)

Dirac Fermions in Blue Phosphorene Monolayer

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