Spin chain on a metallic surface: Dissipation-induced order versus Kondo entanglement
Spin chain on a metallic surface: Dissipation-induced order versus Kondo entanglement
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DOI：
10.1103/physrevb.106.l161103
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发表时间：
2022-03
影响因子：
3.7
通讯作者：
Bimla Danu;M. Vojta;T. Grover;F. Assaad
中科院分区：
文献类型：
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作者：
Bimla Danu;M. Vojta;T. Grover;F. Assaad
我们探索具有近藤相互作用 J k 的自旋 1/2 海森堡链与二维电子气的物理原理。在弱 J k 时，问题映射到局部耦合到耗散欧姆浴的海森堡链上。在解耦固定点，耗散是一个边际相关的扰动，并沿着链驱动长程反铁磁有序。在动态自旋结构因子中，我们观察到类似于朗道阻尼戈德斯通模式的二次低能色散。总的来说，J k 近藤屏蔽占主导地位，链的自旋相关性继承了主体金属的幂律，类似于顺磁重费米液体。在这两个阶段中，我们观察到复合费米子谱函数中费米能量附近的重带。我们的结果是从辅助场量子蒙特卡罗模拟中获得的，为反铁磁金属和重费米子金属之间的量子跃迁提供了一种独特的无负号实现。我们在金属表面磁性吸附原子链的扫描隧道光谱实验的背景下讨论了我们的结果的相关性。
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.