A NOR–AND quantum running gate molecule

Renaud, Nicolas; Ito, Masanori; Shangguan, W. Z.; Saeys, Mark; Hliwa, Mohamed; Joachim, Christian

doi:10.1016/j.cplett.2009.02.071

Cited by 12 publications

(15 citation statements)

References 18 publications

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“…Furthermore, these and other QI effects [11][12][13][14] can be influenced by molecular structure and gating (in a three-terminal device), opening new routes to functional molecular devices such as switches, 15 memory devices, 16 transistors, [17][18][19] rectifiers, 20 and logic gates. 21 Several conductance experiments comparing cross-conjugated and linearly conjugated molecules have been reported by now. To name a key set of results: much lower conductance values have been found for molecules with meta-substituted benzene rings as compared to para-substituted rings, [22][23][24][25][26][27] in agreement with calculations.…”

Section: Introductionmentioning

confidence: 99%

Cross-conjugation and quantum interference: a general correlation?

Valkenier

Guedon

Markussen

et al. 2014

Phys. Chem. Chem. Phys.

119

116

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We discuss the relationship between the π-conjugation pattern, molecular length, and charge transport properties of molecular wires, both from an experimental and a theoretical viewpoint. Specifically, we focus on the role of quantum interference in the conductance properties of cross-conjugated molecules. For this, we compare experiments on two series of dithiolated wires. The first set we synthesized consists of three dithiolated oligo(phenylene ethynylene) (OPE) benchmark compounds with increasing length. The second series synthesized comprises three molecules with different π-conjugation patterns, but identical lengths, i.e. an anthracene (linear conjugation), an anthraquinone (cross-conjugation), and a dihydroanthracene (broken conjugation) derivative. To benchmark reliable trends, conductance experiments on these series have been performed by various techniques. Here, we compare data obtained by conductive-probe atomic force microscopy (CP-AFM) for self-assembled monolayers (SAMs) with single-molecule break junction and multi-molecule EGaIn data from other groups. For the benchmark OPE-series, we consistently find an exponential decay of the conductance with molecular length characterized by β = 0.37 ± 0.03 Å(-1) (CP-AFM). Remarkably, for the second series, we do not only find that the linearly conjugated anthracene-containing wire is the most conductive, but also that the cross-conjugated anthraquinone-containing wire is less conductive than the broken-conjugated derivative. We attribute the low conductance values for the cross-conjugated species to quantum interference effects. Moreover, by theoretical modeling, we show that destructive quantum interference is a robust feature for cross-conjugated structures and that the energy at which complete destructive interference occurs can be tuned by the choice of side group. The latter provides an outlook for future devices in this fascinating field connecting chemistry and physics.

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Section: Introductionmentioning

confidence: 99%

Cross-conjugation and quantum interference: a general correlation?

Valkenier

Guedon

Markussen

et al. 2014

Phys. Chem. Chem. Phys.

119

116

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“…In this short research news, we demonstrate that all the proposed designs – i.e., semi‐classical intramolecular circuits,18 intramolecular quantum Hamiltonian circuits,19 and qubit molecular systems17 logic gates – are all different versions of the quantum control of intramolecular processes. The semi‐classical intramolecular circuit design is usually performed using a multi‐channel multi‐electrode scattering approach.…”

Section: Advanced Quantum Logic Gatesmentioning

confidence: 91%

The Different Designs of Molecule Logic Gates

2011

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From the bottom, it is demonstrated how all the known intramolecular single-molecule logic gate architectures – semi-classical circuits, quantum Hamiltonian circuits, and qubit circuits – are different versions of the quantum control of intramolecular processes. They only differ in the way the classical input data are encoded on the quantum molecular system and how the quantum-to-classical conversion proceeds to read the output.

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“…7 leads to the design of a molecule QHC logic gate, the dinitroanthracene represented in Fig. 7d was recalculated 9 using the ESQC technique as presented in Fig. 8.…”

Section: Molecular Design Of Qhc Logic Gatesmentioning

confidence: 99%

“…In a more realistic molecular implementation, the structure of the electronic Hamiltonian and the selection of the input encoding requires a very good optimization. The modifications of the Hamiltonian in charge of controlling the intrinsic electronic quantum evolution of the molecule can be obtained either using twistable functional chemical group chemically bound to the molecule, 9 the application of a variable electrical field 10 or the manipulation of single surface metal atom to coordinate them with the conjugated board of the logic gate molecule. 13 These modifications of the Hamiltonian shift in energy and rearrange a large portion of the molecular states and therefore controls its electronic conductance which can be measured at specific position on the conjugated board of the molecule.…”

Section: Introductionmentioning

confidence: 99%

Quantum design rules for single molecule logic gates

Renaud

Hliwa

Joachim

2011

Phys. Chem. Chem. Phys.

Self Cite

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Recent publications have demonstrated how to implement a NOR logic gate with a single molecule using its interaction with two surface atoms as logical inputs [W. Soe et al., ACS Nano, 2011, 5, 1436]. We demonstrate here how this NOR logic gate belongs to the general family of quantum logic gates where the Boolean truth table results from a full control of the quantum trajectory of the electron transfer process through the molecule by very local and classical inputs practiced on the molecule. A new molecule OR gate is proposed for the logical inputs to be also single metal atoms, one per logical input.

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A NOR–AND quantum running gate molecule

Cited by 12 publications

References 18 publications

Cross-conjugation and quantum interference: a general correlation?

Cross-conjugation and quantum interference: a general correlation?

The Different Designs of Molecule Logic Gates

Quantum design rules for single molecule logic gates

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