论文标题
二维电子通道中的电诱导的电荷密度波：超出局部密度近似
Electrically induced charge-density waves in a two-dimensional electron channel: Beyond the Local Density Approximation
论文作者
论文摘要
在上一篇论文中，我们提出，跨二维电子气体通道施加的宏观力场可能会在适当的可压缩性变为阴性后立即诱导微观电荷密度波，这在密度远高于Wigner晶体过渡的临界密度上。该建议是基于对局部密度近似中基态能的计算。在本文中，我们通过包括对动能的自洽梯度校正来完善对能量的计算。由于快速密度变化的能源成本增加，我们发现电荷密度波的发作的临界密度要低得多。这种临界密度与在没有电场的情况下对均匀基态进行线性稳定性分析的结果。
In a previous paper we suggested that a macroscopic force field applied across a two-dimensional electron gas channel could induce a microscopic charge density wave as soon as the proper compressibility becomes negative, which happens at densities much higher than the critical density for the Wigner crystal transition. The suggestion was based on a calculation of the ground state energy in the local density approximation. In this paper we refine our calculation of the energy by including a self-consistent gradient correction to the kinetic energy. Due to the increased energy cost of rapid density variations, we find a much lower critical density for the onset of the charge density wave. This critical density coincides with the result of a linear stability analysis of the uniform ground state in the absence of the electric field.
