[![enter image description here][1]][1]

Let's focus on the longitudinal resistance, I have two confusions: 1. why it shows spike like feature every time the hall conductance jumps? 2. why its amplitude grows when the magnetic field grows?

I find some literature says when the landau level is half filled with electrons, the peak shows, why? [1]: https://i.sstatic.net/I7UA8.png

[![Diagram[1]][1]

Let's focus on the longitudinal resistance, I have two confusions:

1. Why it shows spike like feature every time the hall conductance jumps?
2. Why its amplitude grows when the magnetic field grows?

I find some literature says when the Landau level is half filled with electrons, the peak shows. Why? [1]: https://i.sstatic.net/I7UA8.png