Kavli Affiliate: Sander Otte
| First 5 Authors: Evert W. Stolte, Jinwon Lee, Hester Vennema, Rik Broekhoven, Esther Teng
| Summary:
Nuclear spins owe their long-lived magnetic states to their excellent
isolation from their environment. At the same time, a limited degree of
interaction with their surroundings is necessary for reading and writing the
spin state. Detailed knowledge of and control over the atomic environment of a
nuclear spin is therefore key to optimizing conditions for quantum information
applications. Scanning tunnelling microscopy (STM), combined with electron spin
resonance (ESR), provides atomic-scale information of individual nuclear spins
via the hyperfine interaction. While this approach proved successful in mapping
the nuclear spin energy levels, insight in its intrinsic behaviour in the time
domain remain limited. Here, we demonstrate single-shot readout of an
individual $^{text{49}}$Ti nuclear spin with an STM. Employing a pulsed
measurement scheme, we find its intrinsic lifetime to be 5.3 $pm$ 0.5 seconds.
Furthermore, we shed light on reveal the pumping and relaxation mechanism of
the nuclear spin by investigating its response to both ESR driving and DC
tunneling current, which is supported by model calculations involving flip-flop
interactions with the electron spin in the same atom. These findings give an
atomic-scale insight into the nature of nuclear spin relaxation and are
relevant for the development of atomically-assembled qubit platforms.
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