Enhanced Dirac node separation in strained Cd3As2 topological semimetal

Abstract

In topological semimetals, nodes appear at symmetry points in the Brillouin zone as a result of band inversion, and yield quasi-relativistic massless fermions at low energies. Cd3As2 is a three-dimensional topological semimetal that hosts two Dirac cones responsible for a variety of quantum phenomena. In this work, we demonstrate the strain tuning of the Dirac nodes of Cd3As2 through a combination of magnetooptical infrared spectroscopy and high-resolution X-ray diffraction studies performed on epitaxial films. In these thin films, we observe a giant enhancement of the node separation in momentum space by close to a factor of 4. A combination of experimental measurements and theoretical modelling allows relate the origin of this enhancement to a strengthening of the topological band inversion driven by lattice strain. Our results demonstrate how strain can be used as a knob to tune the topological properties of semimetals and to potentially enhance their performance and response for various applications.

References in corpus (22)

• Weyl and Dirac Semimetals in Three Dimensional Solids
• Three Dimensional Dirac Semimetal and Quantum Transports in Cd3As2
• Observation of a topological 3D Dirac semimetal phase in high-mobility Cd3As2
• Observation of the chiral magnetic effect in ZrTe5
• Landau Quantization and Quasiparticle Interference in the Three-Dimensional Dirac Semimetal Cd3As2
• Giant negative magnetoresistance induced by the chiral anomaly in individual Cd3As2 nanowires
• Experimental discovery of a topological Weyl semimetal state in TaP
• Cd3As2 is Centrosymmetric
• Efficient Terahertz Harmonic Generation with Coherent Acceleration of Electrons in the Dirac Semimetal Cd3As2
• The chiral anomaly factory: Creating Weyl fermions with a magnetic field
• Non-perturbative high-harmonic generation in the three-dimensional Dirac semimetal Cd${}_3$As${}_2$
• Magneto-optical signature of massless Kane electrons in Cd3As2
• 3D Dirac semimetal Cd3As2: A review of material properties
• Temperature-driven massless Kane fermions in HgCdTe crystals: verification of universal velocity and rest-mass description
• Electrical manipulation of semiconductor spin qubits within the g-matrix formalism
• Ultrafast photothermoelectric effect in Dirac semimetallic Cd3As2 revealed by terahertz emission
• Widely Tunable Optical and Thermal Properties of Dirac Semimetal Cd${}_3$As${}_2$
• The energy scale of Dirac electrons in Cd3As2
• Evidence for pressure-induced node-pair annihilation in Cd3As2
• Strain-gradient induced topological transition in bent nanoribbons of the Dirac semimetal Cd3As2
• Light-hole states in a strained quantum dot: numerical calculation and phenomenological models
• Determination of the crystal field splitting energy in Cd3As2 using magnetooptics