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Light effective hole mass in undoped Ge/SiGe quantum wells

机译:未掺杂的GE / SIGE量子井中的轻有效孔肿块

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摘要

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.
机译:我们报告了未掺杂的锗量子孔中的密度依赖性有效孔质量测量。我们能够在距离表面不同12和44nm的不同深度的凝固覆盖GE通道定位顶部门控场效应晶体管中的大范围的密度(2.0 - 11 x 10(11)厘米(-2)) 。从Shubnikov-de HAAS振荡的幅度的热阻尼,我们测量0.061m(e)的亮度,密度为2.2×10(11)厘米(-2)。我们通过密度和通过外推的理论上预测的依赖性,并且通过外推,我们发现了与0.05m(e)的有效质量为0.05米(e),这是平面平台的最裂缝的有效质量,所述平面平台在量子点中显示出旋转Qubits的平面平台。

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  • 来源
    《Physical review》 |2019年第4期|041304.1-041304.4|共4页
  • 作者单位

    Delft Univ Technol QuTech POB 5046 NL-2600 GA Delft Netherlands|Delft Univ Technol Kavli Inst Nanosci POB 5046 NL-2600 GA Delft Netherlands;

    Delft Univ Technol QuTech POB 5046 NL-2600 GA Delft Netherlands|Delft Univ Technol Kavli Inst Nanosci POB 5046 NL-2600 GA Delft Netherlands;

    Delft Univ Technol QuTech POB 5046 NL-2600 GA Delft Netherlands|Delft Univ Technol Kavli Inst Nanosci POB 5046 NL-2600 GA Delft Netherlands;

    IHP Leibniz Inst Innovat Mikroelekt Technol Pk 25 D-15236 Frankfurt Germany;

    IHP Leibniz Inst Innovat Mikroelekt Technol Pk 25 D-15236 Frankfurt Germany|Univ Roma Tre Dipartimento Sci Viale Marconi 446 I-00146 Rome Italy;

    QuTech Stieltjesweg 1 NL-2628 CK Delft Netherlands|Netherlands Org Appl Sci Res TNO Stieltjesweg 1 NL-2628 CK Delft Netherlands;

    Delft Univ Technol QuTech POB 5046 NL-2600 GA Delft Netherlands|Delft Univ Technol Kavli Inst Nanosci POB 5046 NL-2600 GA Delft Netherlands;

    Delft Univ Technol QuTech POB 5046 NL-2600 GA Delft Netherlands|Delft Univ Technol Kavli Inst Nanosci POB 5046 NL-2600 GA Delft Netherlands;

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