scholarly journals Quantum stochastic resonance of individual Fe atoms

2021 ◽  
Vol 7 (33) ◽  
pp. eabg2616
Author(s):  
Max Hänze ◽  
Gregory McMurtrie ◽  
Susanne Baumann ◽  
Luigi Malavolti ◽  
Susan N. Coppersmith ◽  
...  
Keyword(s):  
Stochastic Resonance ◽  
Excited States ◽  
Scanning Tunneling Microscope ◽  
Electron Tunneling ◽  
Spin Dynamics ◽  
General Mechanism ◽  
Scanning Tunneling ◽  
Inelastic Electron ◽  
Crossover Region ◽  
Inelastic Electron Tunneling

Stochastic resonance, where noise synchronizes a system’s response to an external drive, is a wide-reaching phenomenon found in noisy systems spanning from the dynamics of neurons to the periodicity of ice ages. Quantum tunneling can extend stochastic resonance to the quantum realm. We demonstrate quantum stochastic resonance for magnetic transitions in atoms by inelastic electron tunneling with a scanning tunneling microscope. Stochastic resonance is shown deep in the quantum regime, where spin-state fluctuations are driven by tunneling of the magnetization, and in a semiclassical crossover region, where thermally excited electrons drive transitions between ground and excited states. Inducing synchronization by periodically modulating transition rates provides a general mechanism to determine real-time spin dynamics ranging from milliseconds to picoseconds.

scholarly journals Molecular attachment to a microscope tip: inelastic tunneling, Kondo screening, and thermopower

2019 ◽  
Vol 10 ◽  
pp. 1243-1250
Author(s):  
Rouzhaji Tuerhong ◽  
Mauro Boero ◽  
Jean-Pierre Bucher
Keyword(s):  
Single Molecule ◽  
Electron Tunneling ◽  
Vibrational Excitation ◽  
Scanning Tunneling ◽  
Clear Correlation ◽  
Inelastic Electron ◽  
Free Standing ◽  
Molecule Junction ◽  
Inelastic Electron Tunneling ◽  
Electron Tunneling Spectroscopy

The vibrational excitation related transport properties of a manganese phthalocyanine molecule suspended between the tip of a scanning tunneling microsope (STM) and a surface are investigated by combining the local manipulation capabilities of the STM with inelastic electron tunneling spectroscopy. By attachment of the molecule to the probe tip, the intrinsic physical properties similar to those exhibited by a free standing molecule become accessible. This technique allows one to study locally the magnetic properties, as well as other elementary excitations and their mutual interaction. In particular a clear correlation is observed between the Kondo resonance and the vibrations with a strong incidence of the Kondo correlation on the thermopower measured across the single-molecule junction.

scholarly journals Binding Behavior of Carbonmonoxide to Gold Atoms on Ag(001)

2020 ◽  
Vol 63 (15-18) ◽  
pp. 1578-1584
Author(s):  
David Kuhness ◽  
Jagriti Pal ◽  
Hyun Jin Yang ◽  
Nisha Mammen ◽  
Karoliina Honkala ◽  
...  
Keyword(s):  
Binding Sites ◽  
Density Functional ◽  
Electron Tunneling ◽  
Scanning Tunneling ◽  
Inelastic Electron ◽  
Tunneling Microscopy ◽  
Binding Behavior ◽  
Inelastic Electron Tunneling ◽  
Experimental Findings ◽  
Electron Tunneling Spectroscopy

AbstractThe adsorption behavior of single CO molecules at 4 K bound to Au adatoms on a Ag(001) metal surface is studied with scanning tunneling microscopy (STM) and inelastic electron tunneling spectroscopy (IETS). In contrast to earlier observations two different binding configurations are observed—one on top of a Au adatom and the other one adsorbed laterally to Au on Ag(001). Moreover, IETS reveals different low-energy vibrational energies for the two binding sites as compared to the one for a single CO molecule bound to Ag(001). Density functional theory (DFT) calculations of the adsorption energies, the diffusion barriers, and the vibrational frequencies of the CO molecule on the different binding sites rationalize the experimental findings.

scholarly journals Active optical antennas driven by inelastic electron tunneling

Nanophotonics ◽  
2018 ◽  
Vol 7 (9) ◽  
pp. 1503-1516 ◽  
Author(s):  
Kai Braun ◽  
Florian Laible ◽  
Otto Hauler ◽  
Xiao Wang ◽  
Anlian Pan ◽  
...  
Keyword(s):  
Noble Metal ◽  
High Speed ◽  
Electron Tunneling ◽  
Electromagnetic Coupling ◽  
Near Field ◽  
Scanning Tunneling ◽  
Inelastic Electron ◽  
Tunneling Microscopy ◽  
Inelastic Electron Tunneling ◽  
Nano Antennas

AbstractIn this review, we focus on the experimental demonstration of enhanced emission from single plasmonic tunneling junctions consisting of coupled nano antennas or noble metal tips on metallic substrates in scanning tunneling microscopy. Electromagnetic coupling between resonant plasmonic oscillations of two closely spaced noble metal particles leads to a strongly enhanced optical near field in the gap between. Electron beam lithography or wet chemical synthesis enables accurate control of the shape, aspect ratio, and gap size of the structures, which determines the spectral shape, position, and width of the plasmonic resonances. Many emerging nano-photonic technologies depend on the careful control of such localized resonances, including optical nano antennas for high-sensitivity sensors, nanoscale control of active devices, and improved photovoltaic devices. The results discussed here show how optical enhancement inside the plasmonic cavity can be further increased by a stronger localization via tunneling. Inelastic electron tunneling emission from a plasmonic junction allows for new analytical applications. Furthermore, the reviewed concepts represent the basis for novel ultra-small, fast, optically, and electronically switchable devices and could find applications in high-speed signal processing and optical telecommunications.

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