Quantum Halo States in Helium Tetramers

Area of Science:

• Quantum physics
• Nuclear physics
• Atomic clusters

Background:

• Quantum halo states exhibit universality across different physics fields.
• Previous studies focused on two- and three-body systems.

Purpose of the Study:

• Investigate weakly bound helium tetramers.
• Determine if these four-body systems qualify as quantum halos.

Main Methods:

• Utilized the diffusion Monte Carlo method.
• Employed pure estimators for accurate calculations.
• Estimated ground-state binding energies and structural properties.

Main Results:

• Helium tetramer properties showed less sensitivity to potential models than trimers.
• Predicted the existence of a realistic four-body halo: 4He23He2.
• Identified 4He4 and 4He33He as quasi-halo prototypes.

Conclusions:

• Four-body helium systems can exhibit halo characteristics.
• These systems serve as valuable prototypes for studying quantum halos.
• Experimental validation of tetramer properties is encouraged.