Evidence for pressure-induced node-pair annihilation in Cd3As2

Abstract

As an intermediate state in the topological phase diagram, Dirac semimetals are of particular interest as a platform for studying topological phase transitions under external modulations. Despite a growing theoretical interest in this topic, it remains a substantial challenge to experimentally tune the system across topological phase transitions. Here, we investigate the Fermi surface evolution of Cd3As2 under high pressure through magnetotransport. A sudden change in Berry phase occurs at 1.3 GPa along with the unanticipated shrinkage of the Fermi surface, which occurs well below the structure transition point (~2.5 GPa). High pressure X-ray diffraction also reveals an anisotropic compression of the Cd3As2 lattice around a similar pressure. Corroborated by the first-principles calculations we show that an axial compression will shift the Dirac nodes towards the Brillouin zone center and eventually introduces a finite energy gap. The ability to tune the node position, a vital parameter of Dirac semimetals, can have dramatic impacts on the corresponding topological properties such as the Fermi arc surface states and the chiral anomaly. Our study demonstrates axial compression as an efficient approach for manipulating the band topology and exploring the critical phenomena near the topological phase transition in Cd3As2.

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• Possible pressure-induced topological quantum phase transition in the nodal line semimetal ZrSiS
• Experimental evidence of crystal symmetry protection for the topological nodal line semimetal state in ZrSiS
• Strain-gradient induced topological transition in bent nanoribbons of the Dirac semimetal Cd3As2
• Optical spectroscopy study on pressure-induced phase transitions in the three-dimensional Dirac semimetal Cd${}_3$As${}_2$
• Enhanced Dirac node separation in strained Cd3As2 topological semimetal
• Pressure-induced reconstructive phase transition in Cd${}_3$As${}_2$
• Correlated interaction effects in three-dimensional semi-Dirac semimetal
• Increasing the number of topological nodal lines in semimetals via uniaxial pressure
• Global phase diagram of Coulomb-interacting anisotropic Weyl semimetals with disorder
• Tunable spin-charge conversion in class-I topological Dirac semimetals