@article{MTMT:34040360, title = {Configuration-Specific Insight into Single-Molecule Conductance and Noise Data Revealed by the Principal Component Projection Method}, url = {https://m2.mtmt.hu/api/publication/34040360}, author = {Balogh, Zoltán and Mezei, Gréta and Tenk, N. and Magyarkuti, András and Halbritter, András Ernő}, doi = {10.1021/acs.jpclett.3c00677}, journal-iso = {J PHYS CHEM LETT}, journal = {JOURNAL OF PHYSICAL CHEMISTRY LETTERS}, volume = {14}, unique-id = {34040360}, issn = {1948-7185}, abstract = {We explore the merits of neural network boosted, principal-component-projection-based,unsupervised data classification in single-molecule break junctionmeasurements, demonstrating that this method identifies highly relevanttrace classes according to the well-defined and well-visualized internalcorrelations of the data set. To this end, we investigate single-moleculestructures exhibiting double molecular configurations, exploring therole of the leading principal components in the identification ofalternative junction evolution trajectories. We show how the properprincipal component projections can be applied to separately analyzethe high- or low-conductance molecular configurations, which we exploitin 1/f-type noise measurements on bipyridine molecules. This approachuntangles the unclear noise evolution of the entire data set, identifyingthe coupling of the aromatic ring to the electrodes through the pi orbitals in two distinct conductance regions, and its subsequent uncouplingas these configurations are stretched.}, keywords = {Chemistry, Physical; JUNCTIONS; SHOT-NOISE; THERMOPOWER; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology}, year = {2023}, pages = {5109-5118}, orcid-numbers = {Halbritter, András Ernő/0000-0003-4837-9745} } @article{MTMT:32183347, title = {1/f noise spectroscopy and noise tailoring of nanoelectronic devices}, url = {https://m2.mtmt.hu/api/publication/32183347}, author = {Balogh, Zoltán and Mezei, Gréta and Pósa, László and Sánta, Botond and Magyarkuti, András and Halbritter, András Ernő}, doi = {10.1088/2399-1984/ac14c8}, journal-iso = {NANO FUTURES}, journal = {NANO FUTURES}, volume = {5}, unique-id = {32183347}, year = {2021}, eissn = {2399-1984}, orcid-numbers = {Halbritter, András Ernő/0000-0003-4837-9745} } @article{MTMT:31868928, title = {Structural Memory Effects in Gold–4,4′-Bipyridine–Gold Single-Molecule Nanowires}, url = {https://m2.mtmt.hu/api/publication/31868928}, author = {Magyarkuti, András and Balogh, Zoltán and Mezei, Gréta and Halbritter, András Ernő}, doi = {10.1021/acs.jpclett.0c03765}, journal-iso = {J PHYS CHEM LETT}, journal = {JOURNAL OF PHYSICAL CHEMISTRY LETTERS}, volume = {12}, unique-id = {31868928}, issn = {1948-7185}, year = {2021}, pages = {1759-1764}, orcid-numbers = {Magyarkuti, András/0000-0002-7041-3404; Balogh, Zoltán/0000-0002-9580-361X; Halbritter, András Ernő/0000-0003-4837-9745} } @article{MTMT:31265427, title = {Unsupervised feature recognition in single-molecule break junction data}, url = {https://m2.mtmt.hu/api/publication/31265427}, author = {Magyarkuti, András and Balogh, Nóra and Balogh, Zoltán and Venkataraman, Latha and Halbritter, András Ernő}, doi = {10.1039/D0NR00467G}, journal-iso = {NANOSCALE}, journal = {NANOSCALE}, volume = {12}, unique-id = {31265427}, issn = {2040-3364}, year = {2020}, eissn = {2040-3372}, pages = {8355-8363}, orcid-numbers = {Halbritter, András Ernő/0000-0003-4837-9745} } @article{MTMT:31694496, title = {Voltage-Controlled Binary Conductance Switching in Gold-4,4 '-Bipyridine-Gold Single-Molecule Nanowires}, url = {https://m2.mtmt.hu/api/publication/31694496}, author = {Mezei, Gréta and Balogh, Zoltán and Magyarkuti, András and Halbritter, András Ernő}, doi = {10.1021/acs.jpclett.0c02185}, journal-iso = {J PHYS CHEM LETT}, journal = {JOURNAL OF PHYSICAL CHEMISTRY LETTERS}, volume = {11}, unique-id = {31694496}, issn = {1948-7185}, abstract = {We investigate gold-4,4'-bipyridine-gold single-molecule junctions with the mechanically controllable break junction technique at cryogenic temperature (T = 4.2 K). We observe bistable probabilistic conductance switching between the two molecular binding configurations, influenced both by the mechanical actuation and by the applied voltage. We demonstrate that the relative dominance of the two conductance states is tunable by the electrode displacement, whereas the voltage manipulation induces an exponential speedup of both switching times. The detailed investigation of the voltage-tunable switching rates provides an insight into the possible switching mechanisms.}, year = {2020}, pages = {8053-8059}, orcid-numbers = {Halbritter, András Ernő/0000-0003-4837-9745} } @article{MTMT:3346970, title = {Classification of conductance traces with recurrent neural networks}, url = {https://m2.mtmt.hu/api/publication/3346970}, author = {Lauritzen, KP and Magyarkuti, András and Balogh, Zoltán and Halbritter, András Ernő and Solomon, GC}, doi = {10.1063/1.5012514}, journal-iso = {J CHEM PHYS}, journal = {JOURNAL OF CHEMICAL PHYSICS}, volume = {148}, unique-id = {3346970}, issn = {0021-9606}, abstract = {We present a new automated method for structural classification of the traces obtained in break junction experiments. Using recurrent neural networks trained on the traces of minimal cross-sectional area in molecular dynamics simulations, we successfully separate the traces into two classes: point contact or nanowire. This is done without any assumptions about the expected features of each class. The trained neural network is applied to experimental break junction conductance traces, and it separates the classes as well as the previously used experimental methods. The effect of using partial conductance traces is explored, and we show that the method performs equally well using full or partial traces (as long as the trace just prior to breaking is included). When only the initial part of the trace is included, the results are still better than random chance. Finally, we show that the neural network classification method can be used to classify experimental conductance traces without using simulated results for training, but instead training the network on a few representative experimental traces. This offers a tool to recognize some characteristic motifs of the traces, which can be hard to find by simple data selection algorithms.}, year = {2018}, eissn = {1089-7690}, orcid-numbers = {Halbritter, András Ernő/0000-0003-4837-9745} } @article{MTMT:3322772, title = {Electronic and Mechanical Characteristics of Stacked Dimer Molecular Junctions}, url = {https://m2.mtmt.hu/api/publication/3322772}, author = {Magyarkuti, András and Adak, Olgun and Halbritter, András Ernő and Venkataraman, Latha}, doi = {10.1039/C7NR08354H}, journal-iso = {NANOSCALE}, journal = {NANOSCALE}, volume = {10}, unique-id = {3322772}, issn = {2040-3364}, abstract = {Break-junction measurements are typically aimed at characterizing electronic properties of single molecules bound between two metal electrodes. Although these measurements have provided structure-function relations for such devices, there is little work that studies the impact of molecule-molecule interaction on junction characteristics. Here, we use scanning tunneling microscope based break-junction technique to study pi-stacked dimer junctions formed with two amine-terminated conjugated molecules. We show that the conductance, force and flicker noise of such dimers differ dramatically when compared with the corresponding monomer junctions and discuss the implications of these results on intra and inter-molecular charge transport.}, year = {2018}, eissn = {2040-3372}, pages = {3362-3368}, orcid-numbers = {Halbritter, András Ernő/0000-0003-4837-9745} } @article{MTMT:30369444, title = {In situ impedance matching in Nb/Nb 2 O 5 /PtIr memristive nanojunctions for ultra-fast neuromorphic operation}, url = {https://m2.mtmt.hu/api/publication/30369444}, author = {Molnár, Dániel and Török, Tímea Nóra and Sánta, Botond and Gubicza, Ágnes and Magyarkuti, András and Hauert, Roland and Kiss, Gábor and Halbritter, András Ernő and Csontos, Miklós}, doi = {10.1039/C8NR06226A}, journal-iso = {NANOSCALE}, journal = {NANOSCALE}, volume = {10}, unique-id = {30369444}, issn = {2040-3364}, year = {2018}, eissn = {2040-3372}, pages = {19290-19296}, orcid-numbers = {Halbritter, András Ernő/0000-0003-4837-9745} } @article{MTMT:3184494, title = {Temporal correlations and structural memory effects in break junction measurements}, url = {https://m2.mtmt.hu/api/publication/3184494}, author = {Magyarkuti, András and K P, Lauritzen and Balogh, Zoltán and Nyáry, Anna and Mészáros, Gábor and Makk, Péter and G C, Solomon and Halbritter, András Ernő}, doi = {10.1063/1.4975180}, journal-iso = {J CHEM PHYS}, journal = {JOURNAL OF CHEMICAL PHYSICS}, volume = {146}, unique-id = {3184494}, issn = {0021-9606}, year = {2017}, eissn = {1089-7690}, orcid-numbers = {Halbritter, András Ernő/0000-0003-4837-9745} } @article{MTMT:3084482, title = {Egy demonstrációs kísérlet, amelyben az áram egyetlen atomon keresztül folyik}, url = {https://m2.mtmt.hu/api/publication/3084482}, author = {Sánta, Botond and Magyarkuti, András and Halbritter, András Ernő}, journal-iso = {FIZIKAI SZEMLE}, journal = {FIZIKAI SZEMLE}, volume = {66}, unique-id = {3084482}, issn = {0015-3257}, year = {2016}, pages = {154-160}, orcid-numbers = {Halbritter, András Ernő/0000-0003-4837-9745} } @article{MTMT:2697369, title = {Alacsony frekvenciás fűrészfog prekurzor vizsgálata az ASDEX Upgrade tokamakon}, url = {https://m2.mtmt.hu/api/publication/2697369}, author = {Lazányi, Nóra and Horváth, László and Magyarkuti, András and Papp, Gergely and Pokol, Gergő and Pór, Gábor and Valentin, Igochine and Marc, Maraschek}, journal-iso = {NUKLEON}, journal = {NUKLEON}, volume = {5}, unique-id = {2697369}, issn = {1789-9613}, year = {2012} } @article{MTMT:1886811, title = {Low frequency sawtooth precursor activity in ASDEX Upgrade}, url = {https://m2.mtmt.hu/api/publication/1886811}, author = {Papp, Gergely and Pokol, Gergő and Pór, Gábor and Magyarkuti, András and Lazányi, Nóra and Horvath, L and Igochine, V and Maraschek, M}, doi = {10.1088/0741-3335/53/6/065007}, journal-iso = {PLASMA PHYS CONTR F}, journal = {PLASMA PHYSICS AND CONTROLLED FUSION}, volume = {53}, unique-id = {1886811}, issn = {0741-3335}, abstract = {This paper describes the precursor activity observed in the ASDEX Upgrade tokamak before sawtooth crashes in various neutral beam heated plasmas, utilizing the soft x-ray diagnostic. In addition to the well-known (m, n) = (1,1) internal kink mode and its harmonics, a lower frequency mode is studied in detail. Power modulation of this mode is found to correlate with the power modulation of the (1, 1) kink mode in the quasistationary intervals indicating possible nonlinear interaction. Throughout the studied sawtooth crashes, the power of the lower frequency mode rose by several orders of magnitude just before the crash. In addition to its temporal behaviour, its spatial structure was estimated and the most likely value was found to be (1, 1). A possible role of this mode in the mechanism of the sawtooth crash is discussed.}, keywords = {STABILIZATION; OSCILLATIONS; RECONNECTION; PLASMAS; stochasticity; Confinement; tokamak; DISRUPTIONS; MHD MODES; NEOCLASSICAL TEARING MODES}, year = {2011}, eissn = {1361-6587} }