Adsorbate-Induced Modification of the Confining Barriers in a Quantum Box Array

Abstract

Quantum devices depend on addressable elements, which can be modified separately and in their mutual interaction. Self-assembly at surfaces, for example, formation of a porous (metal-) organic network, provides an ideal way to manufacture arrays of identical quantum boxes, arising in this case from the confinement of the electronic (Shockley) surface state within the pores. We show that the electronic quantum box state as well as the interbox coupling can be modified locally to a varying extent by a selective choice of adsorbates, here C 60 , interacting with the barrier. In view of the wealth of differently acting adsorbates, this approach allows for engineering quantum states in on-surface network architectures.

Induced Fit and Mobility of Cycloalkanes within Nanometer-Sized Confinements at 5 K

“…Each pore contains a partially localized electronic ground state giving rise to a peak in the electronic density of states (DOS) 211 meV below the Fermi level ( E F ) with both localized and nonlocalized components. As in the previously investigated Xe − cases, the interaction of the closed-shell c-alkanes with the pore containing a confined electronic state is governed by a combination of van der Waals forces and Pauli repulsion.…”

“…Cycloalkanes represent a textbook case for variable, size-dependent shape and conformational flexibility. − Their investigation inside confinements follows earlier experience gathered with porphyrins, C 60 , , and atomic Xe − being nucleated at different specific sites of on-surface coordination networks. , The molecular structures of c-alkanes are determined by the tetrahedral angle between the sp 3 carbon bonds, thus precluding planar configurations, as observed for aromatics. Different nonplanar conformations allow for a characteristic temperature-dependent dynamicity constrained by the ring-closing covalent bonds that affect the specific heat and crystal packing …”

Self-Assembly of N-Rich Triimidazoles on Ag(111): Mixing the Pleasures and Pains of Epitaxy and Strain

“…An example for the second case is functionalized helicenes with hydrogen bond donor/acceptors, where the considerable strength/directionality of the bond can be modified by metal coordination leading to chain formation, which in some cases promotes enantioselectivity. The role of complementary hydrogen bonds, − their C–H···F analogues, − and cooperative C–H···N hydrogen bonding on the ordered self-assembly pattern on Ag(111) or Au(111) and their influence on the formation of enantiopure/defective or racemic supramolecular aggregates have been studied with heterocyclic tetraazaperylene, hexaazatriphenylene, or pyrazinophenanthroline molecules. − From a kinetic point of view, the formation of achiral structures is facilitated by SR pairing as in ref , especially when nucleation and growth occur far from thermodynamic equilibrium, because the conformers do not need to separate into homochiral domains.…”

Structural Transformation of Surface‐Confined Porphyrin Networks by Addition of Co Atoms

“…However, the formation of porphyrin‐based MOCNs exhibiting a porous structure, i. e., with cavities in the order of a few nm, have been rarely reported [14–16] . Furthermore, the (structural) properties of porous MOCNs allows them to be used as hosts for guest molecules and for the fabrication of quantum corrals [11,17] . Moreover, porous MOCNs can possess intriguing magnetic properties by the inclusion of magnetic centers within their structure, for example, through metallation of the porphyrin core [6,14,15,18–21] …”

“…[ 14 , 15 , 16 ] Furthermore, the (structural) properties of porous MOCNs allows them to be used as hosts for guest molecules and for the fabrication of quantum corrals. [ 11 , 17 ] Moreover, porous MOCNs can possess intriguing magnetic properties by the inclusion of magnetic centers within their structure, for example, through metallation of the porphyrin core. [ 6 , 14 , 15 , 18 , 19 , 20 , 21 ]…”