Direct measurement of hyperfine shifts and radiofrequency manipulation of the nuclear spins in individual CdTe/ZnTe quantum dots

Abstract

We achieve direct detection of electron hyperfine shifts in individual CdTe/ZnTe quantum dots. For the previously inaccessible regime of strong magnetic fields $B_z\gtrsim 0.1$ T, we demonstrate robust polarization of a few-hundred-particle nuclear spin bath, with optical initialization time of $\sim$ 1 ms and polarization lifetime exceeding $\sim$ 1 s. Nuclear magnetic resonance spectroscopy of individual dots reveals strong electron-nuclear interactions characterized by the Knight fields $|B_e|\gtrsim 50$ mT, an order of magnitude stronger than in III-V semiconductor quantum dots. Our studies confirm II-VI semiconductor quantum dots as a promising platform for hybrid electron-nuclear spin quantum registers, combining the excellent optical properties comparable to III-V dots, and the dilute nuclear spin environment similar to group-IV semiconductors.

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Cited by in corpus (4)

• Dynamical suppression of fluctuations in an interacting nuclear spin bath of a self-assembled quantum dot using multiple pulse nuclear magnetic resonance
• Microscopic dynamics of electron hopping in a semiconductor quantum well probed by spin-dependent photon echoes
• Quantum non-demolition measurement of an electron spin qubit through its low-energy many-body spin environment
• Single vanadium ion magnetic dopant in an individual CdTe/ZnTe quantum dot