From 1b2ecb376138a9b85eae3aa86731e53dcf22a6c9 Mon Sep 17 00:00:00 2001 From: "T. van der Sar" <t.vandersar@tudelft.nl> Date: Mon, 21 Jan 2019 15:22:09 +0000 Subject: [PATCH] Update 3_drude_model.md - typo --- src/3_drude_model.md | 2 ++ 1 file changed, 2 insertions(+) diff --git a/src/3_drude_model.md b/src/3_drude_model.md index 7ec9c669..ee00050f 100644 --- a/src/3_drude_model.md +++ b/src/3_drude_model.md @@ -89,12 +89,14 @@ While most materials have $R_{\rm H}>0$, interestingly some materials are found ### Exercise 1: Motion of an electron in a magnetic and an electric field. We first consider an electron in free space, moving in a plane perpendicular to a magnetic field ${\bf B}$ with velocity ${\bf v}$. + 1. What is the shape of the motion of the electron? Calculate the characteristic frequency and time-period $T_c$ of this motion for $B=1$ Tesla. 2. Formulate a differential equation for ${\bf v}$. 3. Now we add an electric $E$ that is perpendicular to ${\bf B}$. Sketch the motion of the electron. 4. Adjust the differential equation of found in (2) to include ${\bf E}$. We now consider an electron in a metal. + 5. Drude theory assumes a scattering time $\tau$. Include this time into the differential equation for the velocity you formulated in 4. 6. Let's assume $\tau \gg T_c$. What would the shape of the motion of the electron be in this limit? What would the shape be when $\tau \ll T_c$? Which of these two limits holds in a typical metal? -- GitLab