Resonant Tunneling (resonant + tunneling)

Distribution by Scientific Domains


Selected Abstracts


Resonant tunneling through a dilute nitride quantum well

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 1 2008
N. Mori
Abstract We have developed a theory for resonant tunneling through a dilute nitride quantum well in the presence of a tilted magnetic field. We show that magneto-tunneling spectroscopy provides a novel means of probing the scattering potential due to randomly distributed nitrogen impurities. This technique can be extended to probe other types and sources of disordered potential. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]


Double and triple frequency oscillations observed in resonant tunneling spectroscopy through edge states around an antidot

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 8 2005
K. Arai
Abstract Resonant tunneling through edge states bounded around an antidot in quantum Hall (QH) regime has been investigated and we have found multiple frequency oscillations in a resonant tunneling through an antidot. We have measured resistance as a function of magnetic field and front gate voltage and found the periodic oscillation in the , = 2 to 1 transition regime. It is related that discrete energy levels are formed in the edge states around the antidot [1]. Not only single peaks but also some split peaks are seen in our data. Fourier power spectrum of the data shows double and triple frequency peak. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]


Molecular rectification in metal,bridge molecule,metal junctions

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 4 2010
Yaqing Liu
Abstract Molecular bridged nanocontacts allow direct electrical addressing of electroactive molecules, which is of interest for the development of molecular based electronic devices. In the present paper, the electroactive molecule 6-ferrocenyl-1-hexanethiol (Fc-HT) was integrated into metal,bridge,metal (MBM) junctions assembled in a scanning tunneling microscope (STM) setup. A diode-like behavior was observed from the current/bias (It/Vb) signal through Au (substrate)/Fc-HT/Au (tip) junction, which presented an asymmetric current response due to the resonant tunneling between metal electrode and ferrocenylthiol molecules. With gate electrode modulation, the enhancement of the tunneling current can be controlled, which allows to tune the direction of the current rectification. Our investigations demonstrated that ferrocenylthiol bridged MBM nanostructure has potential applications in the future design of higher-order heterojunctions components in combination with electrochemical logic gates. [source]


Resonant tunneling through a dilute nitride quantum well

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 1 2008
N. Mori
Abstract We have developed a theory for resonant tunneling through a dilute nitride quantum well in the presence of a tilted magnetic field. We show that magneto-tunneling spectroscopy provides a novel means of probing the scattering potential due to randomly distributed nitrogen impurities. This technique can be extended to probe other types and sources of disordered potential. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]


Current,Voltage Characteristics of a Homologous Series of Polycyclic Aromatic Hydrocarbons

CHEMISTRY - A EUROPEAN JOURNAL, Issue 26 2007
Thilo Böhme Dr.
Abstract A novel alkyl-substituted polycyclic aromatic hydrocarbon (PAH) with D2h symmetry and 78 carbon atoms in the aromatic core (C78) was synthesized, thereby completing a homologous series of soluble PAH compounds with increasing size of the aromatic , system (42, 60, and 78 carbon atoms). The optical band gaps were determined by UV/Vis and fluorescence spectroscopy in solution. Scanning tunneling microscopy (STM) and spectroscopy (STS) revealed diode-like current versus voltage (I,V) characteristics through individual aromatic cores in monolayers at the interface between the solution and the basal plane of graphite. The asymmetry of the current,voltage (I,V) characteristics increases with the increasing size of the aromatic core, and the concomitantly decreasing HOMO,LUMO gap. This is attributed to resonant tunneling through the HOMO of the adsorbed molecule, and an asymmetric position of the molecular species in the tunnel junction. Consistently, submolecularly resolved STM images at negative substrate bias are in good agreement with the calculated pattern for the electron densities of the HOMOs. The analysis provides the basis for tailoring rectification with a single molecule in an STM junction. [source]