Temperature dependence of the amplitude of the Shubnikov-de Haas oscillations in a two-dimensional electron gas

• Published in: Surface science Vol. 229; no. 1; pp. 70 - 72
• Main Authors: Blom, F.A.F., Fontein, P.F., Wolter, J.H., Peeters, F.M., Wu, X., Geerinckx, F., Devreese, J.T.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 02.04.1990; Amsterdam Elsevier Science; New York, NY
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Exact sciences and technology; Physics
• ISSN: 0039-6028; 1879-2758
• DOI: 10.1016/0039-6028(90)90836-W

Shubnikov-de Haas measurements have been performed on a high-mobility Al x Ga 1− x As/GaAs heterostructure as a function of temperature (1.7⩽ T⩽4.2 K) and magnetic field strength (0.25 ⩽ B⩽0.70 T). The temperature dependence of the amplitude of the Shubnikov-de Haas oscillations is used to define an effective mass of the two-dimensional electron gas. This apparent mass depends strongly on temperature and magnetic field and decreases to values much smaller than that for the cyclotron mass. The apparent mass shows a scaling behavior as a function of the dimensionless quantity k BT h ̵ ω c .