Colossal Intrinsic Phase-Shift in Broad sub-Terahertz Band Enabled by Magnetoelastic Coupling for 6G Communication...

Area of Science:

• Condensed Matter Physics
• Materials Science
• Telecommunications Engineering

Background:

• Terahertz (THz) communication for 6G necessitates efficient functional devices like modulators.
• Current THz phase control methods using metamaterials have limited bandwidth and are complex/costly.

Purpose of the Study:

• To introduce a novel, intrinsic method for achieving significant THz phase shifts using the magnetoelastic mechanism.
• To demonstrate a new material, Ba3BiRu2O9, for THz phase modulation.

Main Methods:

• Investigated the magnetoelastic mechanism in Ba3BiRu2O9 for THz phase shift.
• Characterized the material's THz phase-frequency relationship and thermal bistability.
• Performed theoretical calculations to understand the underlying physics of phonon-spin coupling.

Main Results:

• Achieved an intrinsic colossal THz phase shift of ~566° at 0.75 THz.
• Demonstrated a linear phase-frequency relationship from 100-750 GHz, outperforming existing meta-modulators.
• Observed thermally bistable phase shifts and magnetodielectric control.

Conclusions:

• The colossal THz phase shift is attributed to magnetoelastic coupling and dielectric phase modulation.
• Ba3BiRu2O9 shows promise for advanced THz communication devices.
• Proposed a proof-of-concept MODEM system utilizing the material's linear THz phase-frequency response.