论文标题
在2D量子自旋液体中成像旋子密度调制
Imaging spinon density modulations in a 2D quantum spin liquid
论文作者
论文摘要
在某些条件下预测二维三角晶格抗铁磁铁，以表现出量子自旋液态基态，其低能量行为由Spinon Fermi表面描述。然而，由于其分数，无还清的性质，很难直接对产生的纺纱子进行成像。在这里，我们使用扫描隧道光谱来图像由单层1T键$ _2 $（二维Mott Mott Instrator）在单层Fermi表面不稳定性中产生的Spinon密度调制。我们首先证明了在单层1T键$ _2 $中排列在三角形晶格上的局部旋转，通过将其联系到金属1H-TASE $ _2 $ layer并测量近藤效应。随后的分离的单层1T键$ _2 $的光谱成像揭示了反映Spinon密度调制的Hubbard带能量的长波长调制。这允许对Spinon Fermi波形进行直接实验测量，这与2D量子自旋液体的理论预测很好地吻合。这些结果建立了单层1T键$ _2 $，作为研究新型二维量子旋转现象的新平台。
Two-dimensional triangular-lattice antiferromagnets are predicted under some conditions to exhibit a quantum spin liquid ground state whose low-energy behavior is described by a spinon Fermi surface. Directly imaging the resulting spinons, however, is difficult due to their fractional, chargeless nature. Here we use scanning tunneling spectroscopy to image spinon density modulations arising from a spinon Fermi surface instability in single-layer 1T-TaSe$_2$, a two-dimensional Mott insulator. We first demonstrate the existence of localized spins arranged on a triangular lattice in single-layer 1T-TaSe$_2$ by contacting it to a metallic 1H-TaSe$_2$ layer and measuring the Kondo effect. Subsequent spectroscopic imaging of isolated, single-layer 1T-TaSe$_2$ reveals long-wavelength modulations at Hubbard band energies that reflect spinon density modulations. This allows direct experimental measurement of the spinon Fermi wavevector, in good agreement with theoretical predictions for a 2D quantum spin liquid. These results establish single-layer 1T-TaSe$_2$ as a new platform for studying novel two-dimensional quantum-spin-liquid phenomena.
