Interaction Determined Energy Levels in a Quasi-One Dimensional Electron Gas

Speaker
Michael Pepper
Date
04/01/2015 - 12:30Add to Calendar 2015-01-04 12:30:00 2015-01-04 12:30:00 Interaction Determined Energy Levels in a Quasi-One Dimensional Electron Gas We have investigated electron transport in a quasi-one dimensional electron gas where the confinement potential can be progressively weakened so resulting in the energy levels decreasing in energy relative to each other. However the decline occurs at different rates which is attributed to the electron-electron repulsion varying with the shape of the wavefunction. When the former ground state crosses the higher levels we find missing plateaux of quantised conductance, this can also be observed in the increase in the capacitance between the confining gates and the electron gas. Studies of the movement of the levels shows that both crossings and anti-crossings can be observed, this will be discussed along with other consequences of the way the levels interact. The role of the interactions in giving rise to the spin dependent 0.7 structure will be presented. Resnick 210 המחלקה לפיזיקה physics.dept@mail.biu.ac.il Asia/Jerusalem public
Place
Resnick 210
Abstract

We have investigated electron transport in a quasi-one dimensional electron gas where the confinement potential can be progressively weakened so resulting in the energy levels decreasing in energy relative to each other. However the decline occurs at different rates which is attributed to the electron-electron repulsion varying with the shape of the wavefunction. When the former ground state crosses the higher levels we find missing plateaux of quantised conductance, this can also be observed in the increase in the capacitance between the confining gates and the electron gas. Studies of the movement of the levels shows that both crossings and anti-crossings can be observed, this will be discussed along with other consequences of the way the levels interact. The role of the interactions in giving rise to the spin dependent 0.7 structure will be presented.

תאריך עדכון אחרון : 29/12/2014