Related Experiment Video
Updated: May 20, 2025

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
Many-Body Effects on High-Harmonic Generation in Hubbard Ladders
Yuta Murakami1,2, Thomas Hansen3, Shintaro Takayoshi4
1Tohoku University, Institute for Materials Research, Sendai 980-8577, Japan.
Abstract:
We unveil multifaceted effects of spin-charge couplings on the high-harmonic generation (HHG) in Mott insulators by analyzing the two-leg ladder Hubbard model, where spin dynamics activated by the interchain hopping t_{y} drastically modifies the HHG features. When the two chains are decoupled (t_{y}=0), HHG originates from the dynamics of coherent doublon-holon pairs because of spin-charge separation. With increasing t_{y}, the doublon-holon pairs lose their coherence due to their interchain hopping and resultant nonlocal spin strings. Furthermore, the HHG signal from spin polarons-charges dressed by spin clouds-leads to an additional plateau in the HHG spectrum. For large t_{y}, we identify unconventional HHG processes involving three elementary excitations-two polarons and one magnon. Our study is an essential step toward a microscopic understanding of nontrivial many-body effects on HHG in correlated materials beyond conventional semiconductors.
Related Concept Videos
¹H NMR: Interpreting Distorted and Overlapping Signals
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
¹H NMR: Complex Splitting
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
Modes of Standing Waves - I
Standing Waves in a Cavity
Emission Spectra
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration
According to Hooke's law, the vibrational frequency is directly proportional to...

