Ultrafast Spectroscopy of Dirac Semimetal Cd3As2 under Pressure
arXiv:2411.15791 · doi:10.1103/PhysRevB.111.064101
Abstract
Topological properties of a three-dimensional Dirac semimetal Cd3As2, protected by crystal rotation and time-reversal symmetry, can be tuned with the application of pressure. Ultrafast spectroscopy is a unique tool to investigate the character and time evolution of electronic states, emphasizing the signatures of transition. We designed an experimental setup for in-situ pressure-dependent ultrafast optical pump optical probe spectroscopy of Cd3As2 using a symmetric diamond anvil cell. The fast relaxation processes show significant changes across pressure-induced phase transitions at PC1, approximately 3 GPa, and PC2, approximately 9 GPa. A new sub-picosecond time scale relaxation dynamics emerges beyond PC2. Theoretical calculations of differential reflectivity for both interband and intraband processes indicate that the negative (positive) differential reflectivity (Delta R/R) results from the interband (intraband) processes. The pressure-dependent behavior of relaxation dynamics amplitudes beyond PC1 emphasized the necessity of incorporating quadratic band opening in the calculations, explaining the transition of Cd3As2 from a Dirac semimetal to a semiconducting phase. The time evolution of differential reflectivity is calculated using the electronic temperature as a function of time, as provided by the two-temperature model, which fits the experimental data.
arXiv comment20 pages, 5 figures
References in corpus (33)
- The electronic properties of graphene
- Ultrafast graphene photodetector
- Discovery of a Three-dimensional Topological Dirac Semimetal, Na3Bi
- Dirac semimetal and topological phase transitions in A3Bi (A=Na, K, Rb)
- Dirac semimetal in three dimensions
- Topological nodal semimetals
- Three Dimensional Dirac Semimetal and Quantum Transports in Cd3As2
- Optical modulators with two-dimensional layered materials
- Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal CdAs
- Observation of a topological 3D Dirac semimetal phase in high-mobility Cd3As2
- Experimental Realization of a Three-Dimensional Dirac Semimetal
- Extremely large magnetoresistance and ultrahigh mobility in the topological Weyl semimetal NbP
- Classification of stable three-dimensional Dirac semimetals with nontrivial topology
- Superconductivity in Weyl Semimetal Candidate MoTe2
- Large anomalous Nernst effect at room temperature in a chiral antiferromagnet
- Large intrinsic anomalous Hall effect in half-metallic ferromagnet Co3Sn2S2 with magnetic Weyl fermions
- Giant negative magnetoresistance induced by the chiral anomaly in individual Cd3As2 nanowires
- Large magneto-optical Kerr effect and imaging of magnetic octupole domains in an antiferromagnetic metal
- Transport evidence for Fermi-arc mediated chirality transfer in the Dirac semimetal CdAs
- Linear magnetoresistance caused by mobility fluctuations in the n-doped Cd3As2
- Electrical and Thermal Transport at the Planckian Bound of Dissipation in the Hydrodynamic Electron Fluid of WP2
- A High-Performance Mid-infrared Optical Switch Enabled by Bulk Dirac Fermions in Cd3As2
- Ultrafast Broadband Photodetectors based on Three-dimensional Dirac Semimetal Cd3As2
- Topological quantum materials from the viewpoint of chemistry
- Relaxation of Optically Excited Carriers in Graphene
- 3D Dirac semimetal Cd3As2: A review of material properties
- A pressure-induced topological phase with large Berry curvature in PbSnTe
- Terahertz Probe of Photoexcited Carrier Dynamics in Dirac Semimetal Cd3As2
- Ultrafast Relaxation Dynamics of Photoexcited Dirac Fermion in The Three Dimensional Dirac Semimetal Cadmium Arsenide
- Pressure tuning the Fermi-surface topology of the Weyl semimetal NbP
- Breakdown of Three-dimensional Dirac Semimetal State in pressurized Cd3As2
- Transient reflectance of photoexcited CdAs
- Ultrafast Relaxation Dynamics of Spin-Density Wave Order in BaFeAs under High Pressures