# hall effect experiment pdf

To determine which it actually is, the semiconductor is immersed in the magnetic field transverse to the direction of flow of current. Das Plättchen hat die Breite b = 1,2cm und die Dicke d = 1,0mm. The effect was discovered by E.H. Hall in 1879. 4 There is also a fractional quantum Hall effect. In this lab we will only be concerned with the Hall coefficient. from Hall Effect measurements, which are a basic tool for the determination of mobilities. ist der Hall-Effekt deutlich stärker ausgeprägt. Bei einer magnetischen Flussdichte von 106 mT und einer Stromstärke von 30mA misst man eine Hallspannung von – 20,6 mV. 1b). Constant magnetic ﬁeld and temperature and varying control current. A current can be thought of as a negative charge moving in one direction (Fig. The Hall Eﬀect 1 Background In this experiment, the Hall Eﬀect will be used to study some of the physics of charge transport in metal and semiconductor samples. 4, with a magnetic field H in the z direction perpendicular to contacts 1, 2 and 3, 4. 1a) or as a positive charge moving in the opposite direction (Fig. famous Quantum Hall Effect4. It is related to the Hall eld by: V H = Z w 0 E ydy= E yw (11) 2. experiment. a) Bestimmen Sie die Hallkonstante R H von Germanium und begründen sie, dass Elektronen den Ladungstransport bewerkstelligen. Consider a simple crystal mounted as in the Fig. The fundamental quantum of Hall resistance is h/e2 =25,813Ω. EXPERIMENT 20 The Hall Effect Note: Please read the Radiation Safety Regulations at the back of this book Objectives of the Experiment The behaviour of the Hall voltage in a sample of doped germanium is studied in three different set-ups as follows: 1. 2. The Hall Effect experiment determines the sign of the charge carriers in current flow. From equations (5), (7) and (8), we obtain: E y= eB˝ m E x (12) A convenient experimental quantity is the Hall coe cient, R H de ned as: R H = E y J xB = eB˝E x m m ne2˝E xB = 1 ne (13) The Hall coe cient is positive if the charge carriers are positive and negative if the charge carriers are negative.

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