QCD Kondo excitons
QCD Kondo excitons
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DOI：
10.1103/physrevresearch.2.023066
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发表时间：
2019-09
影响因子：
4.2
通讯作者：
Daiki Suenaga;Kei Suzuki;S. Yasui
中科院分区：
文献类型：
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作者：
Daiki Suenaga;Kei Suzuki;S. Yasui
量子色动力学（QCD）近藤效应是一种量子现象，其中重夸克（$c$, $b$）作为杂质粒子存在于由密度极高的轻夸克（$u$, $d$, $s$）组成的夸克物质中。这类似于凝聚态物理中著名的近藤效应。在本文中，我们从理论上证明了“QCD近藤激子”的存在，即轻夸克和重夸克的束缚态，作为受QCD近藤效应支配的夸克物质基态以上的最低激发模式。它们对颜色和电荷是中性的，类似于凝聚态物质中的近道激子，它们是夸克物质正相中不存在的新型准粒子。QCD近道激子具有各种质量和量子数，即口味和自旋偶对（标量、伪标量、矢量和轴矢量）。QCD近藤激子导致输运现象中中性电流的出现，这在晶格QCD模拟中是可测量的。对QCD近藤激子的研究将为我们提供对夸克物质和凝聚态物质共有的新普遍性质的理解。
The quantum chromodynamics (QCD) Kondo effect is a quantum phenomenon in which heavy quarks ($c$, $b$) exist as impurity particles in quark matter composed of light quarks ($u$, $d$, $s$) at extremely high density. This is analogous to the famous Kondo effect in condensed matter physics. In the present paper, we show theoretically the existence of the "QCD Kondo excitons", i.e., the bound states of light quarks and heavy quarks, as the lowest-excitation modes above the ground state of the quark matter governed by the QCD Kondo effect. These are neutral for color and electric charges, similarly to the Kondo excitons in condensed matter, and they are new type of quasiparticles absent in the normal phase of quark matter. The QCD Kondo excitons have various masses and quantum numbers, i.e., flavors and spin parities (scalar, pseudoscalar, vector, and axialvector). The QCD Kondo excitons lead to the emergence of the neutral currents in transport phenomena, which are measurable in lattice QCD simulations. The study of the QCD Kondo excitons will provide us with understanding of new universal properties shared by quark matter and condensed matter.