Zobrazeno 1 - 10
of 40
pro vyhledávání: '"K. Hofbeck"'
Autor:
A. E. Zhukov, P. S. Kop’ev, D.G. Pavel'ev, B. Ya. Melzer, V. M. Ustinov, Karl Friedrich Renk, Stefan Ivanov, A. A. Ignatov, Ekkehard Schomburg, T. Blomeier, K. Hofbeck, Jörg Grenzer, I. Lingott, S. Brandl, Yu. Koschurinov
Publikováno v:
Physical Review B. 58:4035-4038
We report on current oscillation at microwave frequencies in n-doped wide-miniband GaAs/AlAs superlattices. We found that, with increasing miniband width (16--72 meV), the oscillation frequency increased (from 2 to 53 GHz). An analysis of the current
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d21fbdd4c873469bfd52b3e239a18fdc
https://doi.org/10.1103/physrevb.58.4035
https://doi.org/10.1103/physrevb.58.4035
Autor:
Jörg Grenzer, K. Hofbeck, Karl Friedrich Renk, V.M. Ustinov, S. Brandl, A.E. Zhukov, Stefan Ivanov, D.G. Pavel'ev, Ekkehard Schomburg, A. Kovsch, Yu. Koschurinov, Stephan Winnerl, A.A. Ignatov, P. S. Kop’ev, T. Blomeier
Publikováno v:
Solid-State Electronics. 42:1495-1498
We report on millimeter wave generation with a superlattice electronic device (SLED) operated at room temperature. The SLED, containing a wide-miniband GaAs/AlAs superlattice, had a quasi planar structure with two terminals lying in one plane. The de
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a37680f4bf0622e9451d9866db90f1c3
https://doi.org/10.1016/s0038-1101(98)00056-2
https://doi.org/10.1016/s0038-1101(98)00056-2
Autor:
Ekkehard Schomburg, A. A. Ignatov, Jörg Grenzer, Karl Friedrich Renk, K. Hofbeck, Stephan Winnerl
Publikováno v:
Physica B: Condensed Matter. 244:196-200
We discuss, for a GaAs/AlAs superlattice in a high-frequency field, nonlinear transport properties which are due to Bloch oscillations of miniband electrons. The nonlinearities deliver the basis for the development of ultrafast microwave and THz devi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::52422350f8c9d98991bded5e264ca802
https://doi.org/10.1016/s0921-4526(97)00487-0
https://doi.org/10.1016/s0921-4526(97)00487-0
Autor:
S. Brandl, K. Hofbeck, Karl Friedrich Renk, Sergei Ivanov, A. A. Ignatov, Jörg Grenzer, Yu. Koschurinov, Ekkehard Schomburg, T. Blomeier, V. M. Ustinov, P. S. Kop’ev, D.G. Pavel'ev, B. Melzer, I. Lingott
Publikováno v:
physica status solidi (b). 204:485-488
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5d30d415652527078af17c34fbb66400
https://doi.org/10.1002/1521-3951(199711)204:1<485::aid-pssb485>3.0.co
https://doi.org/10.1002/1521-3951(199711)204:1<485::aid-pssb485>3.0.co
Autor:
Ekkehard Schomburg, B. Melzer, A. A. Ignatov, Karl Friedrich Renk, Yu. Koschurinov, Stefan Ivanov, K. Hofbeck, S. Schaposchnikov, D.G. Pavel'ev, P. S. Kop'ev, Jörg Grenzer
Publikováno v:
Physics Letters A. 218:349-353
We report the observation of a high-frequency self-sustained current oscillation in an n doped GaAs AlAs superlattice (at room temperature) that shows a negative differential conductance (Esaki-Tsu superlattice). The superlattice biased in the region
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d473449d106b6ae8ee03b4331fe29dfa
https://doi.org/10.1016/0375-9601(96)00367-2
https://doi.org/10.1016/0375-9601(96)00367-2
Autor:
Ekkehard Schomburg, Petr S. Kop'ev, Karl Friedrich Renk, C. Dummer, J.I. Koschurinov, B. Melzer, Jörg Grenzer, K. Hofbeck, D.G. Pavel'ev, Stefan Ivanov, A. A. Ignatov, S.F. Winnerl, V. Ustinov
Publikováno v:
IEEE Journal of Selected Topics in Quantum Electronics. 2:724-728
We observed frequency multiplication of 65-GHz radiation up to the fifth harmonic (325 GHz; wavelength 0.9 mm) in a superlattice with negative differential conductance at room temperature. The efficiency of multiplication depended strongly on both th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::adc0bfcac1cf400ed2fbed66bcf9c87b
https://doi.org/10.1109/2944.571773
https://doi.org/10.1109/2944.571773
Publikováno v:
SPIE Proceedings.
Directly using sunlight for the illumination of rooms that have no windows is a very important measure for higher energy efficiency and CO2 reduction in the next future, especially for countries along the sunny belt. The Sollektor ®, developed at th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::090f9f7719eea47570d9180d5bab6fd2
https://doi.org/10.1117/12.930447
https://doi.org/10.1117/12.930447
Autor:
S. Brandl, K. Hofbeck, Karl Friedrich Renk, Ekkehard Schomburg, Mohamed Henini, Werner Wegscheider, David Paul Steenson, J.M. Chamberlain
Publikováno v:
Scopus-Elsevier
Applied physics letters, 1999, Vol.74(15), pp.2179-2181 [Peer Reviewed Journal]
Applied physics letters, 1999, Vol.74(15), pp.2179-2181 [Peer Reviewed Journal]
A GaAs/AlAs superlattice with a large miniband (120 meV) showed self-sustained current oscillation at a frequency of 103 GHz giving rise to microwave emission (power 0.5 mW). The emission line had a linewidth of about 1 MHz and was tuneable by about
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0d94f42c6c88253a8e03f505bfcf1db4
https://doi.org/10.1063/1.123793
https://doi.org/10.1063/1.123793
Autor:
R. Scheuerer, A. E. Zhukov, Karl Friedrich Renk, A. Kovsch, Yu. Koschurinov, V. M. Ustinov, S. Brandl, K. Hofbeck, Jörg Grenzer, Ekkehard Schomburg, P. S. Kop’ev, D.G. Pavel'ev, Sergei Ivanov
Publikováno v:
Applied Physics Letters. 73:3117-3119
We report millimeter wave generation by a self-sustained current oscillation in a doped InGaAs/InAlAS wide miniband superlattice. The superlattice (miniband width 160 meV) showed, at room temperature, a current voltage characteristic with negative di
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::68c7dd514da33c8b3f63e26dec2eece7
https://doi.org/10.1063/1.122691
https://doi.org/10.1063/1.122691
Autor:
Sergei Ivanov, A. E. Zhukov, P. S. Kop’ev, Jörg Grenzer, D.G. Pavel'ev, Yu. Koschurinov, K. Hofbeck, Anatoly A. Ignatov, Karl Friedrich Renk, T. Blomeier, V. M. Ustinov, Ekkehard Schomburg, S. Brandl, A. Kovsch
Publikováno v:
Applied Physics Letters. 72:1498-1500
We report on a semiconductor superlattice oscillator for generation of millimeter waves (frequency 65 GHz). The main element of the oscillator is a doped short-period GaAs/AlAs superlattice with negative differential conductance. The oscillator is du
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::35d4b3fcebf4d0790c2edffd660128c2
https://doi.org/10.1063/1.121038
https://doi.org/10.1063/1.121038