Journal
PHYSICAL REVIEW B
Volume 100, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.100.041304
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Funding
- FOM Projectruimte of the Foundation for Fundamental Research on Matter (FOM)
- Netherlands Organisation for Scientific Research (NWO)
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We report density-dependent effective hole mass measurements in undoped germanium quantum wells. We are able to span a large range of densities (2.0 - 11 x 10(11) cm(-2)) in top-gated field effect transistors by positioning the strained buried Ge channel at different depths of 12 and 44 nm from the surface. From the thermal damping of the amplitude of Shubnikov-de Haas oscillations, we measure a light mass of 0.061m(e) at a density of 2.2 x 10(11) cm(-2). We confirm the theoretically predicted dependence of increasing mass with density and by extrapolation we find an effective mass of similar to 0.05m(e) at zero density, the lightest effective mass for a planar platform that demonstrated spin qubits in quantum dots.
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