Search results

1

High Field Magnetotransport of the Pressure Induced Organic Superconductor (BEDT-TTF)_{3}Cl_{2}2H_{2}O

100%

Lubczyński W., Caulfield J., Singleton J., Hayes W., Kurmoo M., Day P.

Acta Physica Polonica A

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1995

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vol. 87

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issue 4-5

777-779

EN

The magnetotransport of single crystals of (BEDT-TTF)_{3}Cl_{2}2H_{2}0 was studied in the Pressure range 10÷20 kbar at continuous magnetic fields up to 15 T and at temperatures down to 700 mK. Above 12.5 kbar a single series of Shubnikov-de Haas oscillations is observed, corresponding to about 0.5-1% of the cross-section of the first Brillouin zone. A superconducting state with the highest transition temperature close to 3 K is stabilised between 10.2 kbar and 13.5 kbar.

2

Phonon Confinement and Electron Capture Time in Quantum Well

51%

Kálna K.

Acta Physica Polonica A

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1997

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vol. 92

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issue 4

805-808

EN

The electron capture time via an electron-polar optical phonon interaction is calculated considering the confinement of a phonon in a GaAs quantum well laser structure. The effect of the phonon confinement decreases the electron capture time about twice comparing the electron capture time obtained from the interaction of an electron with the bulk phonon.

3

THz Emission Induced by an Optical Beating in Nanometer-Length High-Electron-Mobility Transistors

51%

Nouvel P., Torres J., Marinchio H., Laurent T., Palermo C., Varani L., Teppe F., Shiktorov P., Starikov E., Gruzinskis V.

Acta Physica Polonica A

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2011

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vol. 119

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issue 2

199-202

EN

Experimental results of direct measurement of resonant terahertz emission optically excited in InGaAs HEMT channels are presented. The emission was attributed to two-dimensional plasma waves excited by photogeneration of electron-hole pairs in the HEMT channel at the frequency of the beating of two cw-laser sources. The presence of resonances for the radiation emission in the range of f_0 ± 10 GHz (with f_0 from 0.3 up to 0.5 THz) detected by a Si-bolometer is found. The intensity of THz emission exhibits a nonlinear growth with increase of the pumping power.

4

Particle-Hole Symmetry of Charge Excitation Spectra in the Paramagnetic Phase of the Hubbard Model

51%

Dao V., Frésard R.

Acta Physica Polonica A

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2018

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vol. 133

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issue 3

336-342

EN

The Kotliar and Ruckenstein slave-boson representation of the Hubbard model allows to obtain an approximation of the charge dynamical response function resulting from the Gaussian fluctuations around the paramagnetic saddle-point in analytical form. Numerical evaluation in the thermodynamical limit yields charge excitation spectra consisting of a continuum, a gapless collective mode with anisotropic zero-sound velocity, and a correlation induced high-frequency mode at ω ≈ U. In this work we show that this analytical expression obeys the particle-hole symmetry of the model on any bipartite lattice with one atom in the unit cell. Other formal aspects of the approach are also addressed.

5

Plasma Oscillations in Nanotransistors: Application to THz Radiations Detection and Generation

51%

Marinchio H., Sabatini G., Palermo C., Nouvel P., Torres J., Varani L., Shiktorov P., Starikov E., Gružinskis V.

Acta Physica Polonica A

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2011

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vol. 119

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issue 2

103-106

EN

By means of a numerical hydrodynamic model, we consider the mechanism of collective plasma oscillations in a field-effect transistor channel under different excitations and biasing conditions. First, we consider the case of a device externally-excited by a harmonic optical beating or an electronic excitation under constant current condition at the drain. Both situations exhibit sharp resonances related to the first odd plasma modes illustrating the possibility of using the HEMT as a terahertz photomixer or detector. Then, we demonstrate that the frequencies, amplitudes and quality factors of the resonances can be strongly modified by varying the drain biasing condition from current- to voltage-driven operation.

6

Crystal Structure of (NbSe₄)₃I and (NbSe₄)_{10/3}I CDW Compounds at 14 K

44%

Zubko M., Kusz J., Prodan A., Bennett J., Świec P.

Acta Physica Polonica A

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2016

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vol. 130

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issue 4

869-872

EN

Both (NbSe₄)₃I and (NbSe₄)_{10/3}I compounds are interesting system possessing quasi one-dimensional linear chain character and exhibiting nonlinear transport properties with a second order phase transition. The compounds are built of NbSe₄ antiprisms, stacked along the tetragonal c axis into chains in a screw-like arrangement. Performed X-ray low temperature single crystal diffraction measurements allowed to solve, refine and analyze crystal structures of both compounds at 14 K. While (NbSe₄)_{10/3}I compound undergoes structural phase transition to monoclinic phase, (NbSe₄)₃I remains in tetragonal symmetry. Iodine atoms are responsible for the differences in (NbSe₄)_{10/3}I and (NbSe₄)₃I structures causing different spacing in the infinite NbSe₄ chains.

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6 Acta Physica Polonica A

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2 Nouvel P.

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2 Starikov E.

2 Torres J.

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1 Dao V.

1 Day P.

1 Frésard R.

1 Gruzinskis V.

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1 Kálna K.

1 Laurent T.

1 Lubczyński W.

1 Prodan A.

1 Sabatini G.

1 Singleton J.

1 Teppe F.

1 Zubko M.

1 Świec P.

High Field Magnetotransport of the Pressure Induced Organic Superconductor (BEDT-TTF)_{3}Cl_{2}2H_{2}O

Phonon Confinement and Electron Capture Time in Quantum Well

THz Emission Induced by an Optical Beating in Nanometer-Length High-Electron-Mobility Transistors

Particle-Hole Symmetry of Charge Excitation Spectra in the Paramagnetic Phase of the Hubbard Model

Plasma Oscillations in Nanotransistors: Application to THz Radiations Detection and Generation

Crystal Structure of (NbSe₄)₃I and (NbSe₄)_{10/3}I CDW Compounds at 14 K