Realizing and manipulating space-time inversion symmetric topological semimetal bands with superconducting quantum circuits

Abstract

We have experimentally realized novel space-time inversion (P-T) invariant Z2-type topological semimetal-bands, via an analogy between the momentum space and a controllable parameter space in superconducting quantum circuits. By measuring the whole energy spectrum of system, we imaged clearly an exotic tunable gapless band structure of topological semimetals. Two topological quantum phase transitions from a topological semimetal to two kinds of insulators can be manipulated by continuously tuning the different parameters in the experimental setup, one of which captures the Z2 topology of the PT semimetal via merging a pair of nontrivial Z2 Dirac points. Remarkably, the topological robustness was demonstrated unambiguously, by adding a perturbation that breaks only the individual T and P symmetries but keeps the joint PT symmetry. In contrast, when another kind of PT -violated perturbation is introduced, a topologically trivial insulator gap is fully opened.

References in corpus (6)

• Charge insensitive qubit design derived from the Cooper pair box
• High-Fidelity Readout in Circuit Quantum Electrodynamics Using the Jaynes-Cummings Nonlinearity
• Low-decoherence flux qubit
• Measurement and Control of Quasiparticle Dynamics in a Superconducting Qubit
• Observation of topological transitions in interacting quantum circuits
• Measuring a topological transition in an artificial spin 1/2 system

Cited by in corpus (13)

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• Parity-Time Symmetry in Non-Hermitian Complex Optical Media
• Weyl Josephson Circuits
• Emulating topological chiral magnetic effects in artificial Weyl semimetals
• Transconductance quantization in a topological Josephson tunnel junction circuit
• Quantum simulation of general semi-classical Rabi model beyond strong driving regime
• Demonstration of Hopf-link semimetal bands with superconducting circuits
• Vortex-Meissner phase transition induced by two-tone-drive-engineered artificial gauge potential in the fermionic ladder constructed by superconducting qubit circuits
• Simulation of Kitaev model using one-dimensional chain of superconducting qubits and environmental effect on topological states
• Universal Large-order asymptotic behavior of the Strong-coupling and High-Temperature series expansions
• Scattering of Spin-$\frac{1}{2}$ Particles from a $\mathcal{P}\mathcal{T}$-symmetric Complex Potential
• Two-dimensional topological effect in a transmon qubit array with tunable couplings
• Tensor Theory for Higher Dimensional Chern Insulators with Large Chern Numbers