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This study demonstrates how engineered germanium-tin structures can utilize light holes to create switchable spin-orbit interactions, offering a scalable path for robust spin qubits. By enabling electrical control of these interactions without relying on complex interfaces or material strain alone, the research addresses key challenges in scaling quantum processors. This advancement directly enhances the feasibility of practical quantum computing architectures based on semiconductor spin physics.
Germanium’s “light holes” boost spin qubit potential
Strong spin-orbit interactions in quantum channels utilizing germanium’s light holes offer improved electrical control of spin qubits.
Researchers at École Polytechnique de Montréal and Delft University of Technology have demonstrated a new approach to controlling spin qubits using germanium. The team introduced MOS-like epitaxial germanium grown on relaxed germanium-tin with Sn content of 16 percent, revealing a large and tunable Rashba spin-orbit interaction (RSOI) stemming from the material's light hole (LH)-like ground state. The device design allows the RSOI to be completely switched off with specific gate fields, effectively functioning as an on/off SOI switch. The Ge well thickness is 15 nanometers. A static electric field strength is also present. Energy levels H1 and H2 are 2 milli-electronvolts apart. This system combines strong RSOI with planar device scalability, potentially enabling more…
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