Abstract
We present a theoretical investigation of electron transport properties through a two-dimensional electron gas (2DEG) HgTe/CdTe quantum wells (QWs) heterostructure that incorporate two Rashba-modulated regions. Our study demonstrates that the transmission can be effectively tuned by varying the Rashba spin-orbit coupling (RSOC) strength, Fermi energy, and electrical voltage. Efficient spin-conserving and spin-flip transmission can be achieved by adjusting the RSOC modulation strength. Furthermore, fully spin-polarized spin or current transmission with PZ=±1, as well as complete spin-flip conversion with a rate of Tsf=1 are attained by fine-tuning the amplitudes of the two Rashba modulations using gate voltage or adjusting the RSOC strength. This electrical mechanism provides a convenient approach to electrically manipulate both spin and charge currents, which holds promise for low-power device applications.
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