Light effective hole mass in undoped Ge/SiGe quantum wells

M. Lodari, A. Tosato, D. Sabbagh, M. A. Schubert, G. Capellini, A. Sammak, M. Veldhorst, G. Scappucci

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)
57 Downloads (Pure)

Abstract

We report density-dependent effective hole mass measurements in undoped germanium quantum wells. We are able to span a large range of densities (2.0-11×1011cm-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 0.061me at a density of 2.2×1011cm-2. We confirm the theoretically predicted dependence of increasing mass with density and by extrapolation we find an effective mass of ∼0.05me at zero density, the lightest effective mass for a planar platform that demonstrated spin qubits in quantum dots.

Original languageEnglish
Article number041304
Number of pages4
JournalPhysical Review B
Volume100
Issue number4
DOIs
Publication statusPublished - 2019

Fingerprint Dive into the research topics of 'Light effective hole mass in undoped Ge/SiGe quantum wells'. Together they form a unique fingerprint.

  • Cite this