Bismuth Qubits in Silicon: The Role of EPR Cancellation Resonances
Bismuth Qubits in Silicon: The Role of EPR Cancellation Resonances
We investigate electron paramagnetic resonance spectra of bismuth-doped silicon, at intermediate magnetic fields B≃0.1-0.6 T, theoretically and experimentally (with 9.7 GHz X-band spectra). We identify a previously unexplored regime of "cancellation resonances," where a component of the hyperfine coupling is resonant with the external field. We show that this regime …