Shubnikov–de Haas oscillations in two-dimensional hole gases with competing cyclotron and Zeeman energy
Davide Costa (Kavli institute of nanoscience Delft, TU Delft - QCD/Scappucci Lab, TU Delft - QuTech Advanced Research Centre)
Lucas E.A. Stehouwer (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - BUS/Quantum Delft)
Davide Degli Esposti (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Vandersypen Lab)
Giordano Scappucci (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - Electrical Engineering, Mathematics and Computer Science, TU Delft - QCD/Scappucci Lab)
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Abstract
Evaluation of the quantum lifetime in two-dimensional hole systems, together with band-structure parameters such as the effective mass and g factor, becomes challenging when competing energy scales shape Shubnnikov–de Haas oscillations in a magnetic field. Here, we overcome this challenge for holes with pseudospin Jz = ± 2 3, confined in low-disorder strained germanium quantum wells. We extract self-consistently the effective mass, g factor, and quantum lifetime, and estimate a maximum quantum mobility of 133(3) × 103 cm2/V s, setting a benchmark for holes in group IV semiconductors. The high quality of the hole gas if further highlighted by observing clean fractional quantum Hall states at low magnetic field and density.
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