Ultrafast Carrier Relaxation Dynamics in a Nodal-Line Semimetal PtSn${}_4$

Abstract

Topological Dirac nodal-line semimetals host topologically nontrivial electronic structure with nodal-line crossings around the Fermi level, which could affect the photocarrier dynamics and lead to novel relaxation mechanisms. Herein, by using time- and angle-resolved photoemission spectroscopy, we reveal the previously-inaccessible linear dispersions of the bulk conduction bands above the Fermi level in a Dirac nodal-line semimetal PtSn${}_4$, as well as the momentum and temporal evolution of the gapless nodal lines. A surprisingly ultrafast relaxation dynamics within a few hundred femtoseconds is revealed for photoexcited carriers in the nodal line. Theoretical calculations suggest that such ultrafast carrier relaxation is attributed to the multichannel scatterings among the complex metallic bands of PtSn${}_4$ via electron-phonon coupling. In addition, a unique dynamic relaxation mechanism contributed by the highly anisotropic Dirac nodal-line electronic structure is also identified. Our work provides a comprehensive understanding of the ultrafast carrier dynamics in a Dirac nodal-line semimetal.

References in corpus (27)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Phonons and related properties of extended systems from density-functional perturbation theory
• Weyl and Dirac Semimetals in Three Dimensional Solids
• Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions
• Maximally localized Wannier functions: Theory and applications
• WannierTools: An open-source software package for novel topological materials
• EPW: Electron-phonon coupling, transport and superconducting properties using maximally localized Wannier functions
• Topological nodal line semimetals
• Ultrafast collinear scattering and carrier multiplication in graphene
• Snapshots of non-equilibrium Dirac carrier distributions in graphene
• Giant anisotropic nonlinear optical response in transition metal monopnictide Weyl semimetals
• Direct optical detection of Weyl fermion chirality in a topological semimetal
• Colossal Bulk Photovoltaic Effect in a Weyl Semimetal
• Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi2Se3
• Light-induced emergent phenomena in 2D materials and topological materials
• Discovery of Dirac Node Arcs in PtSn4
• Measurement of intrinsic Dirac fermion cooling on the surface of a topological insulator Bi${}_2$Se${}_3$ using time- and angle-resolved photoemission spectroscopy
• Topology and geometry under the nonlinear electromagnetic spotlight
• Magnetic Field Effects on Transport Properties of PtSn4
• Efficient Terahertz Harmonic Generation with Coherent Acceleration of Electrons in the Dirac Semimetal Cd3As2
• Population Inversion in Monolayer and Bilayer Graphene
• Light-Tunable Surface State and Hybridization Gap in Magnetic Topological Insulator MnBi${}_8$Te${}_{13}$
• 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${}_2$
• Van der Waals engineering of ultrafast carrier dynamics in magnetic heterostructures
• 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
• Ultrafast relaxation of acoustic and optical phonons in a topological nodal-line semimetal ZrSiS

Cited by in corpus (5)

• Visualization of Unconventional Rashba Band and Vortex Zero Mode in Topopogical Superconductor Candidate AuSn${}_4$
• Disorder induced dynamical interband response in Dirac nodal line semimetals
• Intrinsic defect intolerance in the ultra-pure metal PtSn${}_4$
• Reshaping the anomalous Hall response in tilted 3D system with disorder correction
• Research on topological materials using ultrafast spectroscopy