摘要:

In this paper, we study the influence of additives in the filling process of via holes for LSI Cu interconnections by using the kinetic Monte Carlo method. As a model for electroplating, we extended the Solid‐by‐Solid model for crystal growth to include additives which inhibit the adsorption of new atoms. This enables us to control the local surface growth rate to find out the optimal deposition condition for void‐free filling. The distribution of additives on the surface and their influence on the surface and void structures are carefully examined. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1764302

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

We propose a physical model which describes the post‐deposition coarsening of coherently strained three‐dimensional islands on a flat substrate. In this model, formulated in terms of a set equations of motion for the island volume and position, both Ostwald ripening mechanism and misfit strain induced elastic effects are taken into account. Large scale computer simulations demonstrate that the repulsive inter‐island elastic interaction causes the island motion, leading to the self‐organized formation of a regular array of islands with both uniform size and spacing. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1764303

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

We present our computer simulation results on the slow dynamics in magnetic fluids. Magnetic fluids are modeled as an ensemble of interacting ferromagnetic nanoparticles suspended in a viscous fluid. From the Brownian dynamics simulations of the model, it is found that the origin of slow dynamics in magnetic fluids is related to the structure formation of magnetic particles. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1764304

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

We present two‐dimensional computer simulation results of magnetic vortex systems driven by Lorentz force through polycrystalline superconductors with random network structures of twin boundaries. Langevin dynamics simulations of a point vortex model demonstrate that (1) the threshold behavior of I‐V curves is observed, and (2) the threshold current is a decreasing function of an average superconducting grain size. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1764305

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

We studied collision between a fluid surface and a rigid disk using smoothed particle hydrodynamics (SPH) technique. Analytical treatment of the problem is extreamely difficult because the free surface of the fluid largely deforms. SPH is an effective method to solve such problems which involve time‐dependent boundary condition. In our model, a collision between the disk and the fluid surface is characterized by Reynolds number, Froude number, angle of incidence of the colliding disk and the ratio of disk density to fluid density. For oblique impact, the disk will go down into fluid or rebound. We numerically investigated the conditions for the rebounds. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1764306

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

Stimulated Raman adiabatic passage method (STIRAP) is well known to be a very effective method for the efficient and selective transition between two molecular eigenstates in molecule. In this study, we generalize the STIRAP to be able to treat the transition to the non‐stationary state in the hydrogen bonded model system. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1764307

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

The experimental study pointed out that voltage noise power spectrum has two types. One is broad‐band noise (BBN), which results from bulk pinning. The other is narrow‐band noise (NBN), which is observed near critical current. Therefore, it is expected to occur in the region of vortex creep. NBN is sensitive to even direction of external current, which is supposed to result from surface condition of superconductors. To find out origin of NBN, we perform simulations of the vortex dynamics in the 2D system with pinning array. Simulations show that the periodic pinning potential generates NBN and the first peak frequency is proportional to voltage. We find that the initial vortex arrangement has effect on the first peak frequency. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1764308

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

The structure ofpara‐chlorobenzyl alcohol (pCBA) andpara‐bromobenzyl alcohol (pBBA) crystals are characterized by the O&sngbnd;H&cellip;O hydrogen bonded chains along c axis. The direction of the hydrogen bond in the low temperature phase (LTP) is opposite to that in the room temperature phase (RTP). These transitions are related to the hydrogen bonds. We performed the molecular dynamics simulation ofpCBA andpBBA crystals in the LTP and RTP using forces determined by gradient of the energy within semiempirical molecular orbital calculation (PM3). From the distribution of the hydrogen atom of −OH group, we found that the hydrogen atoms in the LTP vibrate at the equilibrium position within one site or asymmetric potential. In the RTP, the hydrogen atoms ofpBBA are jumping between the two sites in the symmetric double minimum potential. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1764309

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

Stimulated Raman adiabatic passage method (STIRAP) is well known to be a very effective method for the efficient and selective transition between two molecular eigenstates in molecule. In this study, we generalize the STIRAP to be able to complete transfer between all‐trans and 11‐cis in the retinal. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1764310

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

Recently, the quantum computer (QC) using the nano‐devices have significantly attracted attention, because a large‐scale extention of the qubits could be easily realized in the nano‐devices. However, some problems for the realization of the QC with nano‐devices arise from the short decoherence time and the interaction of qubits only between nearest‐neighbor qubits. Therefore, we try to design the optimal quantum circuit of the quantum Fourier transform in various network system by means of the genetic algorithm (GA). © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1764311

出版商:AIP    

年代:1904

数据来源: AIP