Charge-density-wave and pairing susceptibilities in a two-dimensional electron-phonon model.
Charge-density-wave and pairing susceptibilities in a two-dimensional electron-phonon model.
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DOI：
10.1103/physrevlett.66.778
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发表时间：
1991-02
影响因子：
8.6
通讯作者：
Noack;Scalapino;Scalettar
中科院分区：
文献类型：
--
作者：
Noack;Scalapino;Scalettar
我们给出了二维电子-声子模型的量子蒙特卡罗结果。在半填充时，佩尔斯电荷密度波（CDW）不稳定性主导了体系的行为，抑制了超导性。CDW结构因子随系统大小的变化而变化，并且与我们用来估计{ital T}{sub {ital c}}的有限尺寸Ising-like标度分析相一致。在半填充的情况下，蒙特卡罗计算显示了在{s}波通道中的超导配对，在有强的peerls - cdw相关的区域附近有一个对场磁化率的峰值。
We present quantum Monte Carlo results for a two-dimensional electron-phonon model. At half filling, a Peierls--charge-density-wave (CDW) instability dominates the behavior of the system and suppresses superconductivity. The CDW structure factor scales with system size and is consistent with a finite-size Ising-like scaling analysis which we use to estimate {ital T}{sub {ital c}} for the Peierls-CDW transition. Away from half filling, the Monte Carlo calculations show superconducting pairing in an {ital s}-wave channel, with a peak in the pair field susceptibility near a region in which there are strong Peierls-CDW correlations.