期刊
PHYSICAL REVIEW X
卷 11, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.11.031035
关键词
Condensed Matter Physics
资金
- National Natural Science Foundation of China [11974396]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB33020300]
- Japan Society for the Promotion of Science [JP18H03686, JP19H01808]
- Japan Science and Technology Agency CREST [JPMJCR19T2]
- National Science Foundation [NSF PHY-1748958]
The theoretical study investigates the nonlinear optical response of Tomonaga-Luttinger spin liquids in the context of terahertz two-dimensional coherent spectroscopy. Specifically, the third-order nonlinear magnetic susceptibilities of the XXZ-type spin chain exhibit photon echo, demonstrating the potential of THz 2DCS in probing the dynamical properties of collective excitations in gapless many-body systems. Renormalization-group-irrelevant corrections to the fixed-point Hamiltonian result in dispersion and/or damping of wave packets, which can be sensitively detected by lensing and the photon echo phenomenon.
We study theoretically the nonlinear optical response of Tomonaga-Luttinger spin liquid in the context of terahertz (THz) two-dimensional coherent spectroscopy (2DCS). Using the gapless phase of the XXZ-type spin chain as an example, we show that its third-order nonlinear magnetic susceptibilities chi((3))(+--+) and chi((3))(-++-) exhibit photon echo, where +/- refers to the left- or right-hand circular polarization with respect to the S-z axis. The photon echo arises from a lensing phenomenon in which the wave packets of fractional excitations move apart and then come back toward each other, amounting to a refocusing of the excitations' world lines. Renormalization-group-irrelevant corrections to the fixed-point Hamiltonian result in dispersion and/or damping of the wave packets, which can be sensitively detected by lensing and consequently the photon echo. Our results thus unveil the strength of THz 2DCS in probing the dynamical properties of the collective excitations in a prototypical gapless many-body system.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据