Coherent dynamics of multi-spin V center in hexagonal boron nitride

Area of Science:

• Quantum Information Science
• Condensed Matter Physics
• Materials Science

Background:

• Hexagonal boron nitride (hBN) hosts optically active electron spins suitable for qubits and quantum sensors.
• Understanding coherent spin dynamics is vital for advancing hBN-based quantum technologies.
• The negatively charged boron vacancy (V-) spin in hBN is a promising candidate for these applications.

Purpose of the Study:

• To investigate the Rabi oscillation and coherent dynamics of V- spin ensembles in hBN.
• To analyze the influence of weak and strong magnetic fields on V- spin behavior.
• To explore the role of nuclear spins and electron-nuclear coupling in V- spin dynamics.

Main Methods:

• Experimental demonstration and study of Rabi oscillations in V- spin ensembles in hBN.
• Investigation of spin dynamics under varying magnetic field strengths (weak and strong).
• Theoretical simulations of V- spin dynamics, including electron-nuclear spin coupling.

Main Results:

• Observed distinct spin dynamics of V- ensembles in weak and strong magnetic fields.
• In weak fields, V- spins behave as a single-electron spin system.
• In strong fields, V- spins exhibit multi-spin system behavior with multi-frequency oscillations in Ramsey fringes, indicating nuclear spin driving via electron-nuclear coupling.

Conclusions:

• The study reveals field-dependent spin dynamics in hBN V- centers, crucial for quantum applications.
• Electron-nuclear spin coupling in V- centers can be modulated by magnetic and microwave fields.
• These findings provide fundamental insights for developing advanced hBN-based quantum devices.