Band Formation from Coupled Quantum Dots Formed by a Nanoporous Network on a Copper Surface
Jorge Lobo-Checa,1,*,
,
Manfred Matena,1,
Kathrin Müller,2
Jan Hugo Dil,3,4
Fabian Meier,3,4
Lutz H. Gade,5
Thomas A. Jung,2,
Meike Stöhr1,
The properties of crystalline solids can to a large extent be
derived from the scale and dimensionality of periodic arrays
of coupled quantum systems such as atoms and molecules. Periodic
quantum confinement in two dimensions has been elusive on surfaces,
mainly because of the challenge to produce regular nanopatterned
structures that can trap electronic states. We report that the
two-dimensional free electron gas of the Cu(111) surface state
can be trapped within the pores of an organic nanoporous network,
which can be regarded as a regular array of quantum dots. Moreover,
a shallow dispersive electronic band structure is formed, which
is indicative of electronic coupling between neighboring pore
states.
2 Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
3 Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
4 Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland.
5 Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
* Present address: Centre d'Investigaciò en Nanociència i Nanotecnologia (CIN2), 08193 Bellaterra (Barcelona), Spain.
These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: jorge.lobo{at}cin2.es (J.L.-C.); thomas.jung{at}psi.ch (T.A.J.); meike.stoehr{at}unibas.ch (M.S.)
