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Structural transitions of the vortex lattice in anisotropic superconductors and fingering instability of electron droplets in an inhomogeneous magnetic field.

机译:各向异性超导体中涡旋晶格的结构转变和非均匀磁场中电子液滴的指状不稳定性。

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摘要

I present a derivation of the nondispersive elastic moduli for the vortex lattice within the anisotropic Ginzburg-Landau model. I derive an extension of the virial theorem for superconductivity for anisotropic superconductors, with the anisotropy arising from s-d mixing or an anisotropic Fermi surface. The structural transition from rhombic to square vortex lattice is studied within this model along with the effects of thermal fluctuations on the structural transition. The reentrant transition from square to rhombic vortex lattice for high fields and the instability with respect to rigid rotations of the vortex lattice, predicted by calculations within the nonlocal London model, are also present in the anisotropic Ginzburg-Landau model.; I also study the fingering of an electron droplet in a special Quantum Hall regime, where electrostatic forces are weak. Performing Monte Carlo simulations I study the growth and fingering of the electron droplet in an inhomogeneous magnetic field as the number of electrons is increased. I expand on recent theoretical results and find excellent agreement between my simulations and the theoretical predictions.
机译:我提出了各向异性Ginzburg-Landau模型中涡旋格的非色散弹性模量的推导。我推导了各向异性超导体的超导电性的维里定理的扩展,其中各向异性是由 s-d 混合或各向异性费米表面引起的。在该模型中研究了从菱形到方涡旋晶格的结构转变,以及热涨落对结构转变的影响。各向异性的Ginzburg-Landau模型中也存在高场从正方形到菱形涡旋格的折返过渡以及通过非局部伦敦模型中的计算预测的相对于涡旋格刚性旋转的不稳定性。我还研究了在静电力弱的特殊量子霍尔体系中电子液滴的指法。进行蒙特卡洛模拟时,我研究了随着电子数量的增加,电子液滴在不均匀磁场中的生长和指状现象。我对最近的理论结果进行了扩展,并发现我的模拟与理论预测之间有很好的一致性。

著录项

  • 作者

    Klironomos, Alexios.;

  • 作者单位

    University of Florida.;

  • 授予单位 University of Florida.;
  • 学科 Physics Condensed Matter.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 167 p.
  • 总页数 167
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 O49;
  • 关键词

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