The Experts below are selected from a list of 10317084 Experts worldwide ranked by ideXlab platform
V Zayets - One of the best experts on this subject based on the ideXlab platform.
-
origin of the anomalous magnetic circular dichroism spectral shape in ferromagnetic ga 1 x mn x as impurity bands inside the band gap
Physical Review Letters, 2008Co-Authors: Koji Ando, H Saito, K C Agarwal, M C Debnath, V ZayetsAbstract:The electronic structure of a prototype dilute magnetic semiconductor (DMS), ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$, is studied by magnetic circular dichroism (MCD) spectroscopy. We prove that the optical transitions originated from impurity bands cause the strong positive MCD background. The MCD signal due to the ${E}_{0}$ transition from the valence band to the conduction band is negative indicating that the $p\mathrm{\text{\ensuremath{-}}}d$ exchange interactions between the $p$ carriers and $d$ spin is antiferromagnetic. The negative ${E}_{0}$ MCD signal also indicates that the hole doping of the valence band is not so large as previously assumed. The impurity bands seem to play important roles for the ferromagnetism of ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$.
-
origin of the anomalous magnetic circular dichroism spectral shape in ferromagnetic ga 1 x mnxas impurity bands inside the band gap
Physical Review Letters, 2008Co-Authors: Koji Ando, H Saito, K C Agarwal, M C Debnath, V ZayetsAbstract:The electronic structure of a prototype dilute magnetic semiconductor (DMS), Ga 1-x Mn x As, is studied by magnetic circular dichroism (MCD) spectroscopy. We prove that the optical transitions originated from impurity bands cause the strong positive MCD background. The MCD signal due to the E 0 transition from the valence band to the conduction band is negative indicating that the p-d exchange interactions between the p carriers and d spin is antiferromagnetic. The negative E 0 MCD signal also indicates that the hole doping of the valence band is not so large as previously assumed. The impurity bands seem to play important roles for the ferromagnetism of Ga 1-x Mn x AS.
Koji Ando - One of the best experts on this subject based on the ideXlab platform.
-
origin of the anomalous magnetic circular dichroism spectral shape in ferromagnetic ga 1 x mn x as impurity bands inside the band gap
Physical Review Letters, 2008Co-Authors: Koji Ando, H Saito, K C Agarwal, M C Debnath, V ZayetsAbstract:The electronic structure of a prototype dilute magnetic semiconductor (DMS), ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$, is studied by magnetic circular dichroism (MCD) spectroscopy. We prove that the optical transitions originated from impurity bands cause the strong positive MCD background. The MCD signal due to the ${E}_{0}$ transition from the valence band to the conduction band is negative indicating that the $p\mathrm{\text{\ensuremath{-}}}d$ exchange interactions between the $p$ carriers and $d$ spin is antiferromagnetic. The negative ${E}_{0}$ MCD signal also indicates that the hole doping of the valence band is not so large as previously assumed. The impurity bands seem to play important roles for the ferromagnetism of ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$.
-
origin of the anomalous magnetic circular dichroism spectral shape in ferromagnetic ga 1 x mnxas impurity bands inside the band gap
Physical Review Letters, 2008Co-Authors: Koji Ando, H Saito, K C Agarwal, M C Debnath, V ZayetsAbstract:The electronic structure of a prototype dilute magnetic semiconductor (DMS), Ga 1-x Mn x As, is studied by magnetic circular dichroism (MCD) spectroscopy. We prove that the optical transitions originated from impurity bands cause the strong positive MCD background. The MCD signal due to the E 0 transition from the valence band to the conduction band is negative indicating that the p-d exchange interactions between the p carriers and d spin is antiferromagnetic. The negative E 0 MCD signal also indicates that the hole doping of the valence band is not so large as previously assumed. The impurity bands seem to play important roles for the ferromagnetism of Ga 1-x Mn x AS.
Yao-gen Ding - One of the best experts on this subject based on the ideXlab platform.
-
Researches on an X-Band sheet beam klystron
IEEE Transactions on Electron Devices, 2014Co-Authors: Ding Zhao, Cun-jun Ruan, Xiu Dong Yang, Yuan Liang, Xi Lu, Yao-gen DingAbstract:This paper reports the research work of an X-Band sheet beam klystron with the aim of principle verifi- cation, which is fulfilled at the Institute of Electronics, Chinese Academy of Sciences. This paper includes two phases. The first phase is planned to build the sheet beam electron optics prototype tube using the closed periodically cusped magnetic focusing. The measured data shows that the rectangular beam with the cross section of 50 mm × 4 mm can propagate through ∼300 mm from the cathode surface to the collector with the transmission of 92.4% at the voltage of 110 kV. This foregoing work successfully solves the beam formation and transportation and becomes the basis for developing the sheet beam klystron. In the second phase, the high-frequency interaction structure is designed and cold tested. The X-Band sheet beam klystron is constructed and hot tested in the full voltage. The amplification characteristic can be observed near the voltage of 125 kV. For the drive power of 0.71 kW and the working frequency of 11.69 GHz, the output power of 2.8MWis achieved with the 3 dB bandwidth of 30MHz, and, correspondingly, the gain and the efficiency are 35.96 dB and 32.52%, respectively. At the same time, the beam transmission is 73.3%. An over 93% transmission is realized at the voltage of 135 kV, whereas the oscillation occurs in the tube. This research exhibits that the sheet beam klystron is a promising device for the high-power applications, whereas seeking the measures to overcome the oscillation is still an arduous task in the future.
-
Research Progress on X-Band Multibeam Klystron
IEEE Transactions on Electron Devices, 2009Co-Authors: Yao-gen Ding, Cun-jun Ruan, Bin Shen, Yongqing Zhang, Honghong Gu, Ding Zhang, Caiying WangAbstract:The Institute of Electronics, Chinese Academy of Sciences, started developing X-Band multibeam klystrons (MBKs) in 2000. Three types of X-Band MBKs are currently under research and development; two types operate in the fundamental mode (TM010), and the other type operates in a high-order mode (coaxial TM310). These MBKs operate over the frequency range from 8 to 10 GHz and have peak powers of 50-100 kW, average powers of 2.5-5 kW, and bandwidths of 5%. The design considerations and testing results are presented in this paper. The technological problems, including nonhomogeneity of the RF electric field and low beam transmission, are also described. Further research work on the improvement of these MBKs is discussed.
M C Debnath - One of the best experts on this subject based on the ideXlab platform.
-
origin of the anomalous magnetic circular dichroism spectral shape in ferromagnetic ga 1 x mn x as impurity bands inside the band gap
Physical Review Letters, 2008Co-Authors: Koji Ando, H Saito, K C Agarwal, M C Debnath, V ZayetsAbstract:The electronic structure of a prototype dilute magnetic semiconductor (DMS), ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$, is studied by magnetic circular dichroism (MCD) spectroscopy. We prove that the optical transitions originated from impurity bands cause the strong positive MCD background. The MCD signal due to the ${E}_{0}$ transition from the valence band to the conduction band is negative indicating that the $p\mathrm{\text{\ensuremath{-}}}d$ exchange interactions between the $p$ carriers and $d$ spin is antiferromagnetic. The negative ${E}_{0}$ MCD signal also indicates that the hole doping of the valence band is not so large as previously assumed. The impurity bands seem to play important roles for the ferromagnetism of ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$.
-
origin of the anomalous magnetic circular dichroism spectral shape in ferromagnetic ga 1 x mnxas impurity bands inside the band gap
Physical Review Letters, 2008Co-Authors: Koji Ando, H Saito, K C Agarwal, M C Debnath, V ZayetsAbstract:The electronic structure of a prototype dilute magnetic semiconductor (DMS), Ga 1-x Mn x As, is studied by magnetic circular dichroism (MCD) spectroscopy. We prove that the optical transitions originated from impurity bands cause the strong positive MCD background. The MCD signal due to the E 0 transition from the valence band to the conduction band is negative indicating that the p-d exchange interactions between the p carriers and d spin is antiferromagnetic. The negative E 0 MCD signal also indicates that the hole doping of the valence band is not so large as previously assumed. The impurity bands seem to play important roles for the ferromagnetism of Ga 1-x Mn x AS.
K C Agarwal - One of the best experts on this subject based on the ideXlab platform.
-
origin of the anomalous magnetic circular dichroism spectral shape in ferromagnetic ga 1 x mn x as impurity bands inside the band gap
Physical Review Letters, 2008Co-Authors: Koji Ando, H Saito, K C Agarwal, M C Debnath, V ZayetsAbstract:The electronic structure of a prototype dilute magnetic semiconductor (DMS), ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$, is studied by magnetic circular dichroism (MCD) spectroscopy. We prove that the optical transitions originated from impurity bands cause the strong positive MCD background. The MCD signal due to the ${E}_{0}$ transition from the valence band to the conduction band is negative indicating that the $p\mathrm{\text{\ensuremath{-}}}d$ exchange interactions between the $p$ carriers and $d$ spin is antiferromagnetic. The negative ${E}_{0}$ MCD signal also indicates that the hole doping of the valence band is not so large as previously assumed. The impurity bands seem to play important roles for the ferromagnetism of ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$.
-
origin of the anomalous magnetic circular dichroism spectral shape in ferromagnetic ga 1 x mnxas impurity bands inside the band gap
Physical Review Letters, 2008Co-Authors: Koji Ando, H Saito, K C Agarwal, M C Debnath, V ZayetsAbstract:The electronic structure of a prototype dilute magnetic semiconductor (DMS), Ga 1-x Mn x As, is studied by magnetic circular dichroism (MCD) spectroscopy. We prove that the optical transitions originated from impurity bands cause the strong positive MCD background. The MCD signal due to the E 0 transition from the valence band to the conduction band is negative indicating that the p-d exchange interactions between the p carriers and d spin is antiferromagnetic. The negative E 0 MCD signal also indicates that the hole doping of the valence band is not so large as previously assumed. The impurity bands seem to play important roles for the ferromagnetism of Ga 1-x Mn x AS.
