TiO
Liu Xiaohua;Yin J.;Liu Z. G.;Yin X. B.;Chen G. X.;Wang M.
Applied Surface Science
2001
By in situ optical microscopy and scanning electron microscopy, we investigate the morphology of the iron electrodeposit grown at different H
Zhang Ke-Qin;Wang Mu;Peng Ru-Wen;Xiao Yuming;Ming Nai-ben
Physics Letters Section A General Atomic and Solid State Physics
2001
A YBa
You Li-Xing;Feng Yi-Jun;Yang Sen-Zu;Kang Lin;Wang Mu;Wu Pei-Heng;Yin Xiao-Bo
Chinese Physics Letters
2002
SrBi
Li Ai-Dong;Wu Di;Ling Hui-Qin;Wang Mu;Liu Zhiguo;Ming Naiben
Journal of Crystal Growth
2002
On the basis of the tight-binding model, we have studied the energy spectra and persistent currents (PCs) in one-dimensional k-component Fibonacci (KCF) mesoscopic rings threaded by a magnetic flux. The KCF structures, which contain k basic units, can be periodic (if k = 1), quasiperiodic (if 1 < k < 6), and intermediate cases between quasiperiodicity and disorder (if k ≥ 6). It is shown that the flux-dependent eigenenergies form 'band' structure in the KCF rings. The subbands possess the hierarchical characteristic with self-similarity if 1 < k < 6, while if k ≥ 6, there is no obvious self-similarity in the subbands. In fact, the energy spectra ultimately determine the behaviour of the PCs in the mesoscopic KCF rings. On one hand, the PC depends on the total energy bandwidth: the narrower the bandwidth, the smaller the PC. On the other hand, the parity effect of electrons is dissimilar in different KCF rings. As k increases, there is less likelihood of observing a dramatic change in currents of several orders of magnitude when one electron is added to or removed from the KCF rings. If k is large enough, the current behaviour may approach some features of disordered systems.
Liu Y. M.;Peng R. W.;Jin G. J.;Huang X. Q.;Wang M.;Hu. A.;Jiang S. S.
Journal of Physics Condensed Matter
2002
We study the persistent current (PC) in one-dimensional (ID) magnetic-flux threaded mesoscopic rings, which is constructed according to the random-dimer (RD) model. It is found that the PC varies significantly when the Fermi energy is changed in the system. The PC can approach the behaviour of free electrons regardless of the disorder if there is the extended electronic state at the Fermi level; while the PC can be depressed dramatically if the highest-occupied electronic state is localized or in the intermediate case between the extended state and localized one. This property provides a possible explanation to the anomalously large PC observed in some experiments. Furthermore, it is demonstrated that the electronic delocalization leads to unsuppressed persistent currents and √N unscattered states exist around the resonant energy in the RD model from the viewpoint of the PC. The possibility to use ID random-dimer mesoscopic rings as quantum-switch devices is also discussed. © 2003 The Physical Society of Japan.
Liu Y. M.;Peng R. W.;Huang X. Q.;Wang Mu;Hu A.;Jiang S. S.
Journal of the Physical Society of Japan
2003
Ultrathin Al
Shao Qi-Yue;Li Ai-Dong;Ling Hui-Qin;Wu Di;Wang Yuan;Feng Yan;Liu Zhi-Guo;Wang Mu;Ming Nai-Ben;Yang Sen-Zu
Microelectronic Engineering
2003
In our previous work we demonstrated an unusual crystallite aggregate in which the crystallites correlate in crystallographic orientation and form a fractal pattern with strong anisotropy (Wang, M.; et al. Phys. Rev. Lett. 1998, 80, 3089. Liu, X. Y.; et al. J. Cryst. Growth 2000, 208, 687.). Yet it remains unanswered why each crystallite appears with specific orientation and obeys a strict order. Here we report an in-depth study of the origin of the long-range correlation of the crystallographic orientations in the aggregate investigated by means of micro-X-ray-diffraction, atomic force microscopy, and in-situ optical observation. The experimental data suggest that the topographic regularity of the aggregate arises from the consecutive rotation of the crystallographic orientation in the nucleation-mediated growth. This effect may occur when nucleation takes place in a region with inhomogeneous surface tension, and may help us to understand the long-range ordering effect in aggregating crystallites.
Li Da-Wei;Wang Mu;Peng Ru-Wen;Ming Nai-Ben;Liu Peng
Journal of Physical Chemistry B
2003
To look at a quasi-particle injection into high T
Sun G. Z.;Wu P. H.;Fan S. X.;Ji Z. M.;Yang S. Z.;Xu W. W.;Rang L.;Feng Y.;Wang M.
Superconductor Science and Technology
2003
We present in this letter the observation of the optical resonant transmission of Thue-Morse (TM) dielectric multilayers. For the first time the frequency trifurcation feature has been experimentally demonstrated. This effect can be analogous to the electronic energy spectrum of a TM system, which has not yet been directly obtained in experiments. The resonant transmission originates from the positional correlation of the basic units in the TM system, and is sensitive to the modulation of optical thickness. The experimental results are in good agreement with the theoretical analysis.
Qiu F.;Peng R. W.;Huang X. Q.;Liu Y. M.;Wang M.;Hu A.;Jiang S. S.
Europhysics Letters
2003