Optical control of donor spin qubits in silicon

Article

关键词: BOUND EXCITONS;    ELECTRON-SPIN;    RESONANCE EXPERIMENTS;    RYDBERG STATES;    GERMANIUM;    SEMICONDUCTORS;    RELAXATION;    ACCEPTORS;    READOUT;    SPECTRA;   

DOI  :  10.1103/PhysRevB.92.195411

来源: SCIE

【 摘 要 】

We show how to achieve optical, spin-selective transitions from the ground state to excited orbital states of group-V donors (P, As, Sb, and Bi) in silicon. We consider two approaches based on either resonant, far-infrared (IR) transitions of the neutral donor or resonant, near-IR excitonic transitions. For far-IR light, we calculate the dipole matrix elements between the valley-orbit and spin-orbit split states for all the group-V donors using effective mass theory. We then calculate the maximum rate and amount of electron-nuclear spin-polarization achievable through optical pumping with circularly polarized light. We find this approach is most promising for Bi donors due to their large spin-orbit and valley-orbit interactions. Using near-IR light, spin-selective excitation is possible for all the donors by driving a two-photon Lambda transition from the ground state to higher orbitals with even parity. We show that externally applied electric fields or strain allow similar, spin-selective Lambda transition to odd-parity excited states. We anticipate these results will be useful for future spectroscopic investigations of donors, quantum control and state preparation of donor spin qubits, and for developing a coherent interface between donor spin qubits and single photons.

【 授权许可】

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