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Home > Papers > Condensed-Matter-Physics

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	1. Nonbonding electrons do matter greatly
	Sun Changqing
	Physics 26 February 2009
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	Abstract:Although they exist ubiquitously in our daily activities, the significance of nonbonding states, such as broken bonds, nonbonding lone pair and unpaired electrons, and antibonding dipoles, are often overlooked in practice. Recent research revealed that the presence of these nonbonding states and the associated energetics dominate the fascinating behavior of low-dimensional functional materials including biologic and organic species. It is my hope that this brief review will help increase the awareness of the importance of these electrons and revive interest in them. At the same time, an emphasis is also placed on the essentiality of interpreting the macroscopic properties of a material from the perspective of bond and nonbond formation, dissociation, relaxation and vibration, and the associated energetics and dynamics of charge repopulation, polarization, densification and localization.
	TO cite this article:Sun Changqing. Nonbonding electrons do matter greatly[OL].[26 February 2009] http://en.paper.edu.cn/en_releasepaper/content/29674


	2. Monte Carlo Simulation Study of SEM Images of Rough Surfaces
	Yonggang Li,Shifeng Mao,Huimin Li,Shuman Xiao,Zejun Ding
	Physics 06 January 2009
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	Abstract:In this paper, we have developed a Monte Carlo (MC) simulation method for scanning electron microscopy (SEM) images of rough surfaces. The roughness structure is constructed in a finite element triangulated mesh by using a Gaussian function to describe the distribution of amplitude of the random rough peaks. Further spatial subdividing can accelerate the calculation and improves MC simulation efficiency. The MC model is based on the using of the Mott cross section for description of the electron elastic scattering and the using of the full Penn algorithm in a dielectric functional approach to the electron inelastic scattering. This simulation relates directly a defined rough surface structure described by exact values of roughness parameters with the contrast observed in a SEM image, enabling the investigation of the influence of line edge roughness to the critical dimension (CD) metrology of MOS device by SEM. Example calculation of line images with sidewall roughness demonstrates that the present MC simulation method is useful for CD metrology of nanostructures by CD-SEM and, especially, for the linewidth measurement in the IC industry.
	TO cite this article:Yonggang Li,Shifeng Mao,Huimin Li, et al. Monte Carlo Simulation Study of SEM Images of Rough Surfaces[OL].[ 6 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27382

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	3. Monte Carlo simulation study of quasi-elastic electron scattering from an overlayer/substrate system
	Yonggang Li,Zengming Zhang,Shifeng Mao,Zejun Ding
	Physics 06 January 2009
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	Abstract:Recent experimental results have shown that the recoil energies of electrons elastically scattered by light and heavy atoms can be resolved for an energetic electron beam and at large scattering angles. Full understanding of the scattering processes involved is helpful to sample characterization, and, for providing more knowledge about electron inelastic mean free path. In this work we use a Monte Carlo simulation method to quantitatively study the energy shift, the Doppler broadening and especially the peak intensity ratio for an overlayer/substrate sample. Recoil energy in the electron elastic scattering events is calculated based on our previous Monte Carlo simulation model by taking account of the kinetic energy of atoms. An anisotropic distribution of the velocity direction of the atoms, the Maxwell-Boltzmann thermal energy distribution and also the multiple scattering of electrons are considered in the simulation. By introducing a polarized momentum a good agreement has been obtained on the position shift of quasi-elastic peak between the calculation and experiment. The calculation also shows a quantitative agreement with the experimental results on the peak intensity ratio between different elements for a Ge/C overlayer sample. It is illustrated that the multiple scattering effect is remarkable for a high energy beam.
	TO cite this article:Yonggang Li,Zengming Zhang,Shifeng Mao, et al. Monte Carlo simulation study of quasi-elastic electron scattering from an overlayer/substrate system[OL].[ 6 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27366


	4. Size- and composition-induced band-gap expansion of nanostructured compound semiconductors
	Sun Changqing,Y. Wang,G. Ouyang,L. L. Wang
	Physics 16 December 2008
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	Abstract:We have investigated the joint effect of size and composition-induced band-gap change of semiconductive nanocompounds from the recently-developed bond-order-length-strength (BOLS) correlation mechanism using the approach of local bond average (LBA). An analytical solution has been developed to connect the band-gap energy with the bonding identities of the nanocompounds. Agreement between model predictions with the available experimental measurements of band-gap change of II-VI semiconductor nanocompounds showed that both the particle size and the composition with alloying effect can be used as factors tuning the band-gap energy, suggesting an effective way to realize the desirable properties of semiconductive nanocompounds.
	TO cite this article:Sun Changqing,Y. Wang,G. Ouyang, et al. Size- and composition-induced band-gap expansion of nanostructured compound semiconductors[OL].[16 December 2008] http://en.paper.edu.cn/en_releasepaper/content/26614


	5. Local bond average for the size and temperature dependence of elastic and vibronic properties of nanostructures
	Sun Changqing,Cher Ming Tan,Shanzhong Wang
	Physics 18 November 2008
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	Abstract:With the miniaturization of a solid down to nanometers scale, the mechanical and optical properties of such nanomaterials are different from that of their corresponding bulk materials. A systematic understanding of the atomic origin of the unusual behavior of mechanical and optical properties of a nanosolid is presented here towards the predictions for design and controllable growth of nanosctructured materials. The Local Bond Average (LBA) approximation and bond-order-length-strength (BOLS) correlation mechanism in size, temperature and pressure domain has been developed, which enables the tunability of various measurable properties, such as elastic constants, optical phonon frequency shift. Agreement between predictions and observations reveal that the shortened and strengthened surface bonds are responsible for the observed size dependent change of material properties, while the temperature induced bond expansion and weakening are the physical origin for the temperature dependent change of measurable material properties.
	TO cite this article:Sun Changqing,Cher Ming Tan,Shanzhong Wang. Local bond average for the size and temperature dependence of elastic and vibronic properties of nanostructures[OL].[18 November 2008] http://en.paper.edu.cn/en_releasepaper/content/25820


	6. Phase Separation in two-Species Atomic Bose-Einstein Condensate with Interspecies Feshbach Resonance
	Lu Zhou,Jing Qian,Han Pu,weiping zhang,Hong Y. Ling
	Physics 15 October 2008
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	Abstract:We consider a mixture of two-species atomic Bose-Einstein codensates coupled to a bound molecular state at zero temperature via interspecies Feshbach resonance. The interspecies Feshbach coupling precludes the possibility of doubly mixed phases while enables not only the pure molecular superfluid but also the pure atomic superfluids to exist as distinct phases. We show that this system is able to support a rich set of phase separations, including that between two distinct mixed atom-molecule phases. We pay particular attention to the effects of the Feschbach coupling and the particle collisions on the miscibility of this multi-component condensate system.
	TO cite this article:Lu Zhou,Jing Qian,Han Pu, et al. Phase Separation in two-Species Atomic Bose-Einstein Condensate with Interspecies Feshbach Resonance[OL].[15 October 2008] http://en.paper.edu.cn/en_releasepaper/content/24823


	7. Electrically controlled Kerr effect in magnetophotonic crystal based on nematic liquid crystal
	Da Haixia,Xu Ping,Wu Jianchun,Li Zhenya
	Physics 21 February 2008
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	Abstract:An electrically controllable Kerr effect in magnetophotonic crystal consisting of magnetic materials and nematic liquid crystals is presented based on the properties of nematic liquid crystals. Numerical results show that Kerr effect is changed remarkably by adjusting the permittivity of liquid crystal, and the maximum value of kerr rotation angle becomes large as the permittivity of liquid crystal increases. Such properties demonstrate the possibility of tunable magneto-optical devices based on nematic liquid crystal.
	TO cite this article:Da Haixia,Xu Ping,Wu Jianchun, et al. Electrically controlled Kerr effect in magnetophotonic crystal based on nematic liquid crystal[OL].[21 February 2008] http://en.paper.edu.cn/en_releasepaper/content/18768


	8. Frequency-dependent transport properties for two-channel Luttinger liquid quantum wires
	Cheng Fang,Zhou Guanghui
	Physics 01 June 2007
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	Abstract:We study theoretically the ac transport properties for clean two-channel spinless nonchiral and chiral Luttinger liquid (LL) quantum wires with leads (reservoirs) in the presence of both inter- and intra-channel electron-electron nteractions. Using the equation of motion approach of bosonization technique within linear response theory, we have found that the ac conductivities for the two types of LL quantum wires are generally an oscillation function of the electron-electron interaction strengths, the ratio of Fermi velocities in the channels, the driving frequency and the measurement position in the wire. But the physics is expected to be quite different for these two types of systems and the explanations for this difference are discussed. However, in the dc limit the conductivities for the two types of systems all tend to the conductance quanta of $2e^2/h$. This means that the electron-electron interactions does not renormalize the dc conductivity for finite LL quantum wire systems, which is in agreement with the previous researches.
	TO cite this article:Cheng Fang,Zhou Guanghui. Frequency-dependent transport properties for two-channel Luttinger liquid quantum wires[OL].[ 1 June 2007] http://en.paper.edu.cn/en_releasepaper/content/13208


	9. Anisotropic spin transport in GaAs quantum wells in the presence of competing Dresselhaus and Rashba spin-orbit-coupling strengths
	J. L. Cheng,M. W. Wu,I. C. da Cunha Lima
	Physics 22 March 2007
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	Abstract:Aiming at the optimization of the spin diffusion length in (001) GaAs quantum wells, we explore the effect of the anisotropy of the spin-orbit coupling on the competition between the Rashba and the Dresselhaus spin-orbit couplings by solving the kinetic spin Bloch equations with the electronphonon and the electron-electron scattering explicitly included. For identical strengths of the Rashba and the Dresselhaus spin-orbit couplings, the spin diffusion length shows strong anisotropy not only for the spin polarization direction but also for the spin diffusion direction. Two special directions are used seeking for the large diffusion length: (110) and (110). Without the cubic term of the Dresselhaus spin-orbit coupling and with the identical Dresselhaus and Rashba strengths, infinite diffusion lengths can be obtained either for the spin diffusion/injection direction along (? 10), regardless of the direction of spin polarization, or for the spin polarization along (110), regardless of the direction of the spin diffusion/injection. However, the cubic Dresselhaus term cannot be neglected, resulting into a finite spin diffusion length which decreases with the temperature and the electron density, and of which the anisotropy for the spin diffusion direction and spin polarization direction is maintained. For the spin diffusion/injection direction along (?10), the spin diffusion length increases first with the increase of the Rashba strength (from 0) which can be tuned by the external gate voltage; when the Rashba strength is slightly smaller than (in stead of equal to) the Dresselhaus strength, the diffusion length reaches its maximum; and then it decreases with the Rashba strength.
	TO cite this article:J. L. Cheng,M. W. Wu,I. C. da Cunha Lima. Anisotropic spin transport in GaAs quantum wells in the presence of competing Dresselhaus and Rashba spin-orbit-coupling strengths[OL].[22 March 2007] http://en.paper.edu.cn/en_releasepaper/content/11593


	10. The effect of the antiresonance on the I-V character
	Yu Liu,Yisong Zheng,Weijiang Gong
	Physics 12 September 2006
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	Abstract:The I-V spectrum of electronic transport through a quantum dot chain is calculated by means of the nonequilibrium Green function technique. In such a system, two arbitrary quantum dots are connected with two electron reservoirs through leads. When the dot-lead coupling is very weak, a series of discrete resonant peaks in electron transmission function cause staircase-like I-V characteristic. On the contrary, in the relatively strong dot-lead coupling regime, stairs in the I-V spectrum due to resonance vanish. However, when there are some dangling quantum dots in the chain outside two leads, the antiresonance which corresponds to the zero points of electron transmission function brings about novel staircase characteristic in the I-V spectrum. Moreover, two features in the I-V spectrum arising from the antiresonance are pointed out, which are significant for possible device applications. One is the multiple negative differential conductance regions, and another is regarding to create a highly spin-polarized current through the quantum dot chain by the interplay of the resonance and antiresonance. Finally, we focus on the role that the many-body effect plays on the antiresonance. Our result is that the antiresonance remains when the electron interaction is considered to the second order approximation.
	TO cite this article:Yu Liu,Yisong Zheng,Weijiang Gong. The effect of the antiresonance on the I-V character[OL].[12 September 2006] http://en.paper.edu.cn/en_releasepaper/content/8314

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