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Rosaria Rinaldi
Dipartimento di Matematica e Fisica «E. De Giorgi»
Università del Salento
Scuola Superiore ISUFI
Università del Salento
National Nanotechnology Laboratory
Istituto di NanoScienze CNR
Lecce, ITALY
[email protected]
Università del Salento
Molecular Architectures for QCA-inspired
Boolean Networks
Project coordinator : Prof. Rosaria Rinaldi
INSTITUTE OF NANOSCIENCE - CNR NANO – Lecce (ITALY)
www.molarnet.eu
Project duration: 48 months
Molecular Architectures for QCA-inspired
Boolean Networks
Project coordinator : Prof. Rosaria Rinaldi
INSTITUTE OF NANOSCIENCE - CNR NANO – Lecce (ITALY)
www.molarnet.eu
Project duration: 48 months
Concept and objective
MolArNet aims at demonstrating a feasible molecular
scale architecture for post-Moore nano-electronics as
a possible route towards Molecular Scale Devices and
Systems and unconventional models of computation.
The final goal is a first demonstration of feasibility for
molecular Quantum Cellular Automata (QCA)
elementary devices, working on both technological
and design levels.
From our past work
Paired bisferrocenes are meant to
implement a six-dot cell (option 2 in the
previous slide).
Note that the field is roughly the ratio
between the energy difference and d:
eV/Angstroms=109-1010 V/m
d
Thiolated carbazole linked bisferrocenes
Thiolated carbazole
linked bisferrocenes
V. Arima et al., Nanoscale 2012, 4, 813 – 823.
S. Karmakar et al. Nanoscale 2012, 4, 2311-2316
Molecular Architectures for QCA-inspired
Boolean Networks
Project coordinator : Prof. Rosaria Rinaldi
INSTITUTE OF NANOSCIENCE - CNR NANO – Lecce (ITALY)
www.molarnet.eu
Project duration: 48 months
Concept and objective
MolArNet aims at demonstrating a feasible molecular
scale architecture for post-Moore nano-electronics as
a possible route towards unconventional models of
computation.
The final goal is a first demonstration of feasibility for
molecular Quantum Cellular Automata (QCA)
elementary devices, working on both technological
and design levels.
Consortium :
five academic and one industrial (STMicroelectronics) partners
CONSIGLIO NAZIONALE
DELLE RICERCHE
CNR NANO
ITALY
ALMA MATER STUDIORUMUNIVERSITA’ DI BOLOGNA
UniBo
ITALY
UNIVERSITE’ DE STRASBOURG
UdS
FRANCE
TECHNISCHE UNIVERSITAET
DRESDEN
TUC
GERMANY
TRINITY COLLEGE OF QUEEN
ELIZABETH DUBLIN
TCD
IRELAND
STMICROELECTRONICS SRL
ST Italy
ITALY
Highlight of recent research results:
summary at a glance the consortium know how
Main objectives
synthesis of new molecules suitable for QCA cell implementation;
design and test of new strategies for cell patterning in small networks (molecular
lithography) and for their subsequent assembly in larger networks; with respect to
scaling, in particular, all the major issue are tackled, each by multi-strategy
approach;
characterization of the devices, from single- to few-cell scale, by use of low
temperature scanning probe microscopy and first evaluation of behaviour at larger
temperatures;
design and test of a read-out device for state-sensing at the scale of a single- or fewmolecule (concerning the latter point, the state of an output cell can be in principle
copied on other neighbour cells, possibly making state sensing easier);
full theoretical description of the morphological and functional properties of the
single molecules synthesized;
full theoretical description of the molecules as cells embedded in larger devices and
device operation simulation; effects of non-ideal characteristics on computing
operations, and general design criteria for future cells.
PROJECT STRUCTURE
Scientifically, our strategy rests on three, tightly connected pillars
(corresponding to specific research needs):
(i) tailored design of molecular systems suitable for QCA applications
and their molecular assembly in ordered molecular arrays (either
externally or thermodynamically driven);
(ii) advanced characterization by state of the art scanning tunneling
microscopy and development of single molecule addressing protocols
for manipulation, interconnection and read/write steps;
(iii) theoretical simulations at both the molecular and architectural levels.
This makes MolArNet a really integrated and collaborative project and
will enable
(iv) Molecular QCA device applications (prospect market: worth hundreds
billions of Euros a year).
34 deliverables
18 milestones
478 person months
TOTAL PROJECT COST:
3,876,607.00 €
In QCA no switches (transistors) and hence no current flow are required.
Computation is still binary and Boolean, but the bit is represented through
the charge configuration in a basic cell, which, in the classical case, is an
arrangement of four quantum dots, joined by tunneling paths and charged
with two mobile, opposite-spin electrons and a compensating fixed
positive charge. The two different polarizations are represented in figure
mobile electron
quantum dot
“0”
“1”
“1”
“0”
m-QCA: what we need to
make it work?
m-QCA is a combination of localisation of charge and
Self-organization (circuit design)
Charge localisation
Self-organization
[1] Y. Lu, et.al., J..Am..Chem.Soc., 132, 38 (2010)
[2] K Suto, et.al., J..Am..Chem.Soc., 125, 49 (2003)
29
Basic features of a cell :
chemical structures for QCA
• Let us restrict to the simplest, most abstract concept of
Connectivity is guaranteed
‘cell’:
by the proximal interaction
between cells, thanks to
4 quantum dots
which straight lines (binary
wire) (d), bends (e) and fanout (f) can be implemented.
The majority gate (g) is the
basic building
block of QCA
tunneling is possible
Boolean
networks,
among
dots along
with the inverter (h).
• Must be immobilized, stiff, and correctly balanced from the energy
viewpoint.
31
‘Support’
(guanosine)
‘Cells’
Formation self-assembly of H-bonded guanine
ribbon assemblies from guanosine derivative
functionalized with ferrocene unit.
Each should be ‘reasonably
immobile’ independently of what
charge inside does (QCA 
electrostatics  distances)
The read-out device
Plausible system:
Porphyrine implementation
Questions!!!
Can be phys-absorbed ?
Self-assembly ? How ?
[1] N. Katsonis, et.al., J..Am..Chem.Soc., 128, 48 (2006)
[2] K Suto, et.al., J..Am..Chem.Soc., 125, 49 (2003)
33
Many thanks to the MOLARNET Team
Pier Giorgio Cozzi, University of Bologna (Italy)
Andrea Gualandi, University of Bologna (Italy)
Luca Mengozzi, University of Bologna (Italy)
Francesco Paolucci, University of Bologna (Italy)
Matteo Iurlo, University of Bologna (Italy)
Stefano Masiero, University of Bologna (Italy)
Rosaria C. Perone, University of Bologna (Italy)
Paolo Samorì , Université de Strasbourg (France)
Artur Ciesielski, Université de Strasbourg (France)
Gianaurelio Cuniberti, Dresden University of Technology (Germany)
Rafael Gutierrez, Dresden University of Technology (Germany)
Alejandro Santana, Dresden University of Technology (Germany)
Alessandro Bramanti ST-Microelectronics
Borislav Naydenov, CRANN Dublin (Ireland)
Samuel Torsney, CRANN Dublin (Ireland)
John J. Boland, CRANN Dublin (Ireland)
Giuseppe Maruccio, CNR NANO Lecce (Italy)
Valentina Arima, CNR NANO Lecce (Italy)
Antonio DellaTorre CNR NANO Lecce (Italy)
AnnaGrazia Monteduro CNR NANO Lecce (Italy)
Thank you for your attention