G. Nimtz

University of Cologne

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Rolf Pelster

Saarland University

Axel Enders

University of Bayreuth

Ralf Dornhaus

RWTH Aachen University

P Marquardt

Zittau/Görlitz University of Applied Sciences

B. Schlicht

University of Cologne

A. A. Stahlhofen

Koblenz University of Applied Sciences

P. Pissis

National Technical University of Athens

A. Haibel

University of Cologne

J. P. Stadler

University of Cologne

E. Tyssen

University of Cologne

Cooperative Institutions

University of Cologne

Max Planck Society

Forschungszentrum Jülich

RWTH Aachen University

TH Köln - University of Applied Sciences

University of Stuttgart

Karlsruhe Institute of Technology

Centre National de la Recherche Scientifique

Stadtwerke Jülich (Germany)

National Technical University of Athens

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Size-induced metal-insulator transition in metals and semiconductors

Journal of Crystal Growth (1988)

G. Nimtz P Marquardt H. Gleiter

Microelectronics

Metal–insulator transition

10.1016/0022-0248(90)90700-u

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Citations (67)

The action potential of the plant Mimosa pudica under modulated microwave radiation

Anna Spanoudaki G. Nimtz Michael Weidner

In vivo investigations of a possible influence of modulated microwave radiation on the action potential of the plant Mimosa pudica were carried out. In the preliminary results a tendency was observed for the potential pulse to be higher and of shorter duration. Further measurements are nevertheless necessary in order to rule out a coupling of the high frequency field to the electronic set-up.

Mimosa pudica

10.1109/ise.1999.831987

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Citations (2)

Universal Relationship of Time and Frequency in Photonic Tunnelling

Annalen der Physik (2001)

A. Haibel G. Nimtz

Abstract Tunnelling transit time for frustrated total internal reflection (FTIR) in a double‐prism experiment was measured using microwave radiation. We have found that the transit time is of the same order of magnitude as the corresponding transit time measured either in an undersized waveguide (evanescent modes) or in a photonic lattice. Moreover we have established that in all such experiments the tunnelling transit time is approximately equal to the reciprocal (1/ f ) of the corresponding frequency of radiation.

Transit time

Waveguide

Reflection

Prism

10.1002/andp.20015130802

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Citations (42)

Resonant level in semiconducting Hg1−xCdxTe

Solid State Communications (1975)

Ralf Dornhaus G. Nimtz W. Schlabitz H. Burkhard

Tellurium

Line (geometry)

10.1016/0038-1098(75)90733-4

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Citations (22)

Fully protonated polyaniline: Hopping transport on a mesoscopic scale

Physical review. B, Condensed matter (1994)

Rolf Pelster G. Nimtz Bernhard Weßling

In order to clarify the transport mechanism in fully protanated highly conductive polyaniline the origin and size of the electronic localization centers and barriers have to be determined. Dispersions of polyaniline in an insulating polymer have been studied by temperature-dependent broadband dielectric spectroscopy (5 Hz to 2 GHz, 100--320 K). The electronic transport in the blends and in pure polyaniline is shown to be governed by three-dimensional (3D) hopping between mesoscopic crystalline regions surrounded by amorphous polyaniline and not by intermolecular hopping or molecular scale disorder. Two independent approaches yield an average size of 8 nm for the metallic regions in polyaniline with 3D extended electron wave functions. The barrier width is estimated to be 1.6 nm. The crystalline metallic regions with an amorphous shell correspond to the primary particles which were found in morphological studies.

Mesoscopic physics

Polyaniline nanofibers

10.1103/physrevb.49.12718

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Citations (121)

Galvanomagnetic properties of n-type Hg0.8Cd0.2Te

Solid State Communications (1974)

Ralf Dornhaus G. Nimtz W. Schlabitz P. Zaplinski

10.1016/0038-1098(74)91127-2

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Citations (15)

Tunneling with dissipation

Journal de Physique I (1994)

G. Nimtz H. Spieker H. Brodowsky

Dissipative tunneling was studied with electromagnetic waves. Experiments were carried out with undersized waveguides loaded with a lossy dielectric medium which corresponds to a complex potential barrier. With increasing dissipation the Hartman effect disappears, i.e., the traversal time becomes dependent on barrier length. The results are in agreement with a recent phase time approach on complex tunneling

Lossy compression

Dissipation factor

10.1051/jp1:1994194

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Citations (28)

Microwave Evidence for a Size-Induced Metal-Insulator Transition in Mesoscopic Conductors

MRS Proceedings (1988)

P Marquardt G. Nimtz G. Heite H.-B. Peters

Mesoscopic physics

10.1557/proc-124-155

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Citations (2)

Universal tunneling time for all fields

Annalen der Physik (2008)

G. Nimtz A. A. Stahlhofen

Abstract Tunneling is an outstanding physical process. The observation that particles surmount a high barrier in spite of the fact that they don't have the necessary energy can not be explained by classical physics. However, this so called tunneling became allowed by quantum mechanics. Experimental tunneling studies with different photonic barriers from microwave frequencies up to ultraviolet frequencies point towards a universal tunneling time [1, 2]. Tunneling can be described by virtual, that is, by unobservable particles [3]. In the case of tunneling there is a virtual particle between the real incident and the real transmitted particles. Tunneling modes are solutions of the Schrödinger and of the Helmholtz equations. The most prominent example of the occurrence of tunneling modes in optics is frustrated total internal reflection (FTIR) at double prisms. In 1949 Sommerfeld [4] pointed out that this optical phenomenon represents the analogy of quantum mechanical particle tunneling. Recent experimental and theoretical data confirmed the conjecture that the tunneling process is characterized by a universal tunneling time presumably independent of the kind of field. The observed tunneling processes proceeded at a time of the order of magnitude of the reciprocal frequency of the wave packets.

10.1002/andp.20085200603

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Citations (9)

Size-limited conductivity in submicrometre metal particles. Similarities with conducting polymers?

Synthetic Metals (1991)

G. Nimtz Axel Enders P Marquardt Rolf Pelster Bernhard Weßling

Metal–insulator transition

10.1016/0379-6779(91)91803-i

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Citations (12)