Spin-echo dynamics of a heavy hole in a quantum dot

Abstract

We develop a theory for the spin-echo dynamics of a heavy hole in a quantum dot, accounting for both hyperfine- and electric-field-induced fluctuations. We show that a moderate applied magnetic field can drive this system to a motional-averaging regime, making the hyperfine interaction ineffective as a decoherence source. Furthermore, we show that decay of the spin-echo envelope is highly sensitive to the geometry. In particular, we find a specific choice of initialization and π-pulse axes which can be used to study intrinsic hyperfine-induced hole-spin dynamics, even in systems with substantial electric-field-induced dephasing. These results point the way to designed hole-spin qubits as a robust and long-lived alternative to electron spins.

5 pages, 4 figures; v2: table added, discussion simplified, final published version

References in corpus (8)

• Hyperfine interaction in a quantum dot: Non-Markovian electron spin dynamics
• Theory of electron spin decoherence by interacting nuclear spins in a quantum dot
• Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
• Electron Spin Dephasing due to Hyperfine Interactions with a Nuclear Spin Bath
• Hole - Nuclear Spin Interaction in Quantum Dots
• Direct measurement of the hole-nuclear spin interaction in single quantum dots
• Hybridization and spin decoherence in heavy-hole quantum dots
• Effect of strain on hyperfine-induced hole-spin decoherence in quantum dots