Influence of magnetic field and temperature on negative refractive index in a degenerate three-level atomic system
Year: 2025
Type: article
Abstract: This work investigates the manipulation of the negative refractive index in a degenerate three-level \( \Lambda \)-type atomic system in the presence of an external magnetic field and Doppler broadening. The results show that the bandwidth of the negative refractive index can be significantly broadened by increasing the coupling laser intensity; for example, when \( \Omega_c \) increases from \( 30\gamma \) to \( 60\gamma \), the bandwidth expands from \( [0.5\gamma, 1.5\gamma] \) to \( [1.2\gamma, 4\gamma] \). The spectral position can be flexibly tuned by adjusting the magnetic field, shifting toward lower (higher) frequencies for \( B = -1\gamma_c \) (\( B = 2\gamma_c \)). Temperature has a pronounced effect on both the range and amplitude; increasing the temperature from \( 200\,\mathrm{K} \) to \( 400\,\mathrm{K} \) narrows the range from \( [-1.6\gamma_c, -0.2\gamma_c] \) to \( [-1.1\gamma_c, -0.5\gamma_c] \). These findings may facilitate experimental realization and potential practical applications of EIT-based negative-index materials.
Source: Communications in Physics
Authors: Bang Nguyen Huy, Luong Thi Yen Nga, Ai Nguyen Van, Doai Le Van
Institutions: Vinh University, Trường Đại học Hà Tĩnh
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4416766745
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