论文标题
金属表面上的自旋链：耗散诱导的顺序与围绕围绕
Spin chain on a metallic surface: Dissipation-induced order vs. Kondo entanglement
论文作者
论文摘要
我们向二维电子气体探索了带有Kondo相互作用的Spin-1/2 Heisenberg链的物理学。在薄弱的$ j_k $上，问题将当地耦合到耗散欧姆浴的海森堡连锁店上。在解耦的固定点上，耗散是一种边缘相关的扰动，并沿链条驱动了远程抗铁磁阶。在动态自旋结构因子中，我们观察到类似于Landau抑制戈德石模式的二次低能分散体。大$ J_K $ kondo筛选主导着，链的自旋相关性继承了宿主金属的功率定律，类似于顺磁性重型费米液体。在这两个阶段中，我们都会在复合效力光谱函数中观察到Fermi能量附近的重带。我们的结果是从辅助场量子蒙特卡洛模拟中获得的，它对抗铁磁金属与重毛脂金属之间的量子过渡提供了独特的无符号实现。我们在金属表面上的磁性链链扫描隧道光谱实验的背景下讨论了结果的相关性。
We explore the physics of a spin-1/2 Heisenberg chain with Kondo interaction, $J_k$, to a two-dimensional electron gas. At weak $J_k$ the problem maps onto a Heisenberg chain locally coupled to a dissipative Ohmic bath. At the decoupled fixed point, the dissipation is a marginally relevant perturbation and drives long-range antiferromagnetic order along the chain. In the dynamical spin structure factor we observe a quadratic low-energy dispersion akin to Landau-damped Goldstone modes. At large $J_k$ Kondo screening dominates, and the spin correlations of the chain inherit the power law of the host metal, akin to a paramagnetic heavy Fermi liquid. In both phases we observe heavy bands near the Fermi energy in the composite-fermion spectral function. Our results, obtained from auxiliary-field quantum Monte Carlo simulations, provide a unique negative-sign-free realization of a quantum transition between an antiferromagnetic metal and a heavy-fermion metal. We discuss the relevance of our results in the context of scanning tunneling spectroscopy experiments of magnetic adatom chains on metallic surfaces.
