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Seminar by Dr. Jeongmin Shim: Thermal and spatial entanglement of multi-channel Kondo cloud

Department of Physics, KAIST, Republic of Korea

14.01.2022 at 09:00 

In this talk, I present how the Kondo screening cloud in multi-channel quantum impurity systems is characterized by the entanglement between the impurity and bath electrons. We developed a numerical renormalization group (NRG) method for computing the entanglement [1]. With this, we investigated the thermal suppression of the cloud, exhibiting a power-law entanglement decay at low temperatures with an exponent depending on a scaling dimension [2]. Recently, we have identified that the entanglement also captures the spatial profile of the cloud, such as a shell-like structure arising from channel-anisotropic systems and a power-law tail [3].

[1] JS, H.-S. Sim, and S.-S. B. Lee, Phys. Rev. B 97, 115123 (2018).
[2] D. Kim*, JS*, and H.-S. Sim, Phys. Rev. Lett. 127, 226801 (2021).
[3] JS*, D. Kim*, and H.-S. Sim, in preparation.
(*: equal contribution)