Speaker
Description
We proposed to utilize chiral anomaly [Ref. 1] for the designs of qubits potentially capable of operating at THz frequency and at room temperature. The proposed chiral qubit [Ref. 2] is a microscopic-scale ring made of a chiral semimetal, with the |0⟩ and |1⟩ states corresponding to the symmetric and antisymmetric superpositions of chiral currents circulating along the ring clockwise and counter-clockwise. In this talk, we report on the concept of our proposed chiral qubits and our investigations into several topological control principles driven by quantum coherence and understanding the time dependence of topological phase transition [Refs. 3-5]. These investigations included an experimental demonstration of a unique phonon-assisted topological switching in chiral semimetals [Ref. 3], and a discovery of a giant dissipationless topological photocurrent that carries the imprints of chiral fermions under zero magnetic field [Ref. 4]. The experimental results are compared with the dynamic phonon driving topological phases given theoretically by employing first-principles and effective Hamiltonian methods [Ref. 5].
*In collaboration with Prof. Dmitri Kharzeev of Stony Brook University
References:
[1] Q. Li et al “Chiral magnetic effect in ZrTe5” Nature Physics 12 (6), 550-554 (2016)
[2] D. Kharzeev and Q. Li “Quantum computing using chiral qubits” US Patent #10,657,456 (2020); “The Chiral Qubit: quantum computing with chiral anomaly” arXiv:1903.07133
[3] C Vaswani, et al “Light-driven Raman coherence as a nonthermal route to ultrafast topology switching in a Dirac semimetal” Physical Review X 10 (2), 021013 (2020)
[4] L. Luo et al “A light-induced phononic symmetry switch and giant dissipationless topological photocurrent in ZrTe5” Nature Materials 20 (3), 329-334 (2021)
[5] N. Aryal et al “Topological Phase Transition and Phonon-Space Dirac Topology Surfaces in ZrTe5” Physical Review Letters 126 (1), 016401(2021)
