THz Magneto-optical study of high mobility (CdMn)Te Quantum Wells: Spin-orbit and Many-body effects
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Spin and spin-orbit interactions have become of great importance and interest for the past 20 years, because of the properties that are important in Spintronics, which is one of several possible technologies that could continue the exponential progress related to computer and information technologies. Spintronics is one of the possibilities for replacing conventional charge- based devices, the Si integrated circuit technology, that has followed Moore’s Law for many years, fueling the enormous progress in computational capabilities. This rapid growth is expected to end in 2025-2030. In this context, materials and structures that can facilitate manipulating the electron spin have received considerable attention. Two-dimensional electron-gas (2DEG) systems based on Mn-doped II-VI structures, (the so-called diluted magnetic semiconductors, or DMS) grown by molecular beam epitaxy, provide an interesting and unusual material system for investigating spin-related phenomena. In this DMS system, spin effects arise from the exchange interaction of highly mobile electrons with localized magnetic moments and result in giant paramagnetism and extremely large and tunable spin-splitting. Contrary to the usual semiconductors, in an applied magnetic field B, Landau levels (LLs), the quantized states of electrons in a magnetic field, cross at moderate magnetic fields in II-VI DMS. These crossings of levels can be “tuned” by the Mn composition of the quantum wells and temperature, and are nearly unique to this materials system, which has not been extensively investigated in the THz region of the spectrum.