Hidden charge density wave induced shadow bands and ultrafast dynamics of CuTe investigated using time-resolved ARPES

Abstract

Revealing the fine electronic structure is critical for understanding the underlying physics of low-dimensional materials. Angle-resolved photoemission spectroscopy (ARPES) is a powerful experimental technique for mapping out the experimental electronic structure. By reducing the photon energy (e.g. to 6 eV) using laser sources, a greatly improved momentum resolution can be achieved, thereby providing opportunities for ``zooming in'' the fine electronic structure and even revealing the previously unresolvable bands near the Brillouin zone center. Here, by using quasi-one-dimensional material CuTe as an example, we demonstrate the unique capability of laser-based ARPES in revealing the fine electronic structures of ``hidden'' charge density wave induced shadow bands near the Brillouin zone center, which are previously unresolvable using synchrotron sources. The observation of the shadow bands reveals the CDW phase from the aspect of band folding, and the unpredicted CDW band hybridization strongly modifies the electronic structure and Fermi surface, which suggests that such hybridization must be taken into account for studying the CDW transition. Moreover, the ultrafast non-equilibrium carrier dynamics are captured by time-resolved ARPES, revealing the relaxation dynamics through electron-phonon scattering. Our work demonstrates the advantages of laser-based ARPES in zooming in the fine electronic structures, as well as capturing the ultrafast dynamics of low-dimensional materials.

8 pages, 5 figures

References in corpus (20)

• Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi2Se3
• Light-induced emergent phenomena in 2D materials and topological materials
• Development of a Vacuum Ultra-Violet Laser-Based Angle-Resolved Photoemission System with a Super-High Energy Resolution Better Than 1 meV
• Laser ARPES, the sudden approximation, and quasiparticle-like peaks in Bi2Sr2CaCu2O8+delta
• Time- and Angle-Resolved Photoemission Studies of Quantum Materials
• Angle-resolved photoemission spectroscopy
• Experimental evidence of chiral symmetry breaking in Kekulé-ordered graphene
• Observation of small Fermi pockets protected by clean CuO2 sheets of a high-Tc superconductor
• Fermi surfaces and orbital polarization in superconducting CeO${}_{0.5}$F${}_{0.5}$BiS${}_2$ revealed by angle-resolved photoemission spectroscopy
• Mode-selective coupling of coherent phonons to the Bi2212 electronic band structure
• Self-energy dynamics and mode-specific phonon threshold effect in a Kekulé-ordered graphene
• Coexistence of extended flat band and Kekulé order in Li-intercalated graphene
• Ultrafast time- and angle-resolved photoemission spectroscopy with widely tunable probe photon energy of 5.3-7.0 eV for investigating dynamics of three-dimensional materials
• Population inversion and Dirac fermion cooling in 3D Dirac semimetal Cd${}_3$As${}_2$
• Optical spectroscopy and ultrafast pump-probe study of a quasi-one-dimensional charge density wave in CuTe
• Kondo hybridization and quantum criticality in $\beta$-YbAlB${}_4$ by laser-ARPES
• Electron-phonon driven charge density wave in CuTe
• Spatially-resolved electronic structure of stripe domains in IrTe${}_2$ through electronic structure microscopy
• A newly-designed femtosecond KBe${}_2$BO${}_3$F${}_2$ device with pulse duration down to 55 fs for time- and angle-resolved photoemission spectroscopy
• Distinguishing and controlling Mottness in 1T-TaS${}_2$ by ultrafast light

Cited by in corpus (3)

• Interplay between the charge density wave phase and a pseudogap under antiferromagnetic correlations
• Real and Reciprocal Space Characterization of the 3-Dimensional Charge Density Wave in Quasi-1-Dimensional CuTe
• Dependency of quantum time scales on symmetry