Electrically controlled superconductor-insulator transition and giant anomalous Hall effect in kagome metal CsV3Sb5 nanoflakes

Abstract

The electronic correlations (e.g. unconventional superconductivity (SC), chiral charge order and nematic order) and giant anomalous Hall effect (AHE) in topological kagome metals AV3Sb5 (A= K, Rb, and Cs) have attracted great interest. Electrical control of those correlated electronic states and AHE allows us to resolve their own nature and origin and to discover new quantum phenomena. Here, we show that a protonic gate can largely modulate the effective disorders and carrier density in CsV3Sb5 nanoflakes, leading to significant modifications of SC, unusual charge density wave (CDW) and giant AHE. Notably, we observed a direct superconductor-insulator transition (SIT) driven by superconducting phase fluctuation due to the doping-enhanced disorders, in addition to a large suppression of CDW. Meanwhile, the carrier density modulation shifts the Fermi level across the CDW gap and gives rise to a nontrivial evolution of AHE, in line with the asymmetric density of states of CDW sub-bands near the saddle point. With the first-principles calculations, we suggest the extrinsic skew scattering of holes in the nearly flat bands with finite Berry curvature by multiple impurities accounts for the giant AHE. Our work uncovers a disorder-driven bosonic SIT, outlines a global picture of the giant AHE and reveals its correlation with the unconventional CDW in the AV3Sb5 family.

arXiv comment22 pages, 4 figures

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• Quantum states and intertwining phases in kagome materials
• Chern Fermi pocket, topological pair density wave, and charge-4e and charge-6e superconductivity in kagome superconductors
• Magnetic Breakdown and Topology in the Kagome Superconductor CsV3Sb5 under High Magnetic Field
• Charge fluctuations above $T_{\mathrm{CDW}}$ revealed by glasslike thermal transport in kagome metals $A$V${}_3$Sb${}_5$ ($A$ = K, Rb, Cs)
• Electrical and thermal transport properties of kagome metals $A$Ti${}_3$Bi${}_5$ ($A$ = Rb, Cs)
• Nematic Ising superconductivity with hidden magnetism in few-layer 6R-TaS2
• Anatomy of anomalous Hall effect due to magnetic fluctuations
• Kagome metals
• Extremely large anomalous Hall conductivity and unusual axial diamagnetism in a quasi-1D Dirac material La${}_3$MgBi${}_5$
• Origin of anomalous magnetotransport in kagome superconductors AV${}_3$Sb${}_5$ (A=K,Rb,Cs)
• Electrically tunable, rapid spin-orbit torque induced modulation of colossal magnetoresistance in Mn${}_3$Si${}_2$Te${}_6$ nanoflakes
• Energy landscape and phase competition of CsV3Sb5-, CsV6Sb6-, and TbMn6Sn6-type Kagome materials
• Anomalous Magnetotransport in the Paramagnetic State of a Magnetic Kagome Metal EuTi${}_3$Bi${}_4$
• Topological Superconducting States and Quasiparticle Transport on Kagome Lattice
• Quantum Phase Transition as a Promising Route to Enhance the Critical Current in Kagome Superconductor CsV${}_3$Sb${}_5$
• Enhanced Phonon-Phonon Interactions and Weakened Electron-Phonon Coupling in Charge-Density-Wave Topological Semimetal EuAl4 with a Possible Intermediate Electronic State
• Impact of Charge Density Waves on Superconductivity and Topological Properties in AV${}_3$Sb${}_5$ Kagome Superconductors
• Superconductivity and Electron Correlations in Kagome Metal LuOs3B2
• Universal classes of disorder scatterings in in-plane anomalous Hall effect