Figure 1

Set of photoemission spectra recorded along the $\overline{\Gamma }\mathrm{\text{−}}\overline{M}$ axis for an 8 ML Ag film. Continuous lines guide the eye through the in-plane dispersion of the shallow bands.Reuse & Permissions

Figure 2

Photoemission intensity plot obtained from the data of Fig. 1. The positions of the film and substrate-induced Bragg planes are marked. White dots represent the (111)-projected bulk band structure of Ge.Reuse & Permissions

Figure 3

Band structure resulting from a 2D tight-binding model of a film. The spectral weight of the bands, proportional to the photoemission signal [8, 20], is related to the line thickness in the plots. (a) Four layers in a potential $V_A$ with periodicity $a_A$. (b) Same as in (a), with an additional potential $V_B$ with periodicity $a_B=2a_A$, acting on all layers. (c) Same as in (a), with an additional substrate layer of lattice constant $a_B=2a_A$. QW states of the new type appear. (d) Modulation of the new type of QW states as the hopping parameter to and in the interface scales by a factor $t$; $t=1$ corresponds to the same hopping as within the unperturbed film. (e) Band structure resulting from a 2D tight-binding model of a film of 8 layers and a periodic modulation at the interface with a film/substrate lattice constant ratio $a_A/a_B=11/15$.Reuse & Permissions