High Resolution Spectroscopy of Two-Dimensional Electron Systems

Details High Resolution Spectroscopy of Two-Dimensional Electron Systems High Resolution Spectroscopy of Two-Dimensional Electron Systems

2007-07-11

arxiv.org/abs/0707.1686v1

Nature 448, 176-179 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

There are formatting and minor textual differences between this version and the published version in Nature (follow the DOI li

Scientific paper

10.1038/nature05982

Spectroscopic methods involving the sudden injection or ejection of electrons in materials are a powerful probe of electronic structure and interactions. These techniques, such as photoemission and tunneling, yield measurements of the "single particle" density of states (SPDOS) spectrum of a system. The SPDOS is proportional to the probability of successfully injecting or ejecting an electron in these experiments. It is equal to the number of electronic states in the system able to accept an injected electron as a function of its energy and is among the most fundamental and directly calculable quantities in theories of highly interacting systems. However, the two-dimensional electron system (2DES), host to remarkable correlated electron states such as the fractional quantum Hall effect, has proven difficult to probe spectroscopically. Here we present an improved version of time domain capacitance spectroscopy (TDCS) that now allows us to measure the SPDOS of a 2DES with unprecedented fidelity and resolution. Using TDCS, we perform measurements of a cold 2DES, providing the first direct measurements of the single-particle exchange-enhanced spin gap and single particle lifetimes in the quantum Hall system, as well as the first observations of exchange splitting of Landau levels not at the Fermi surface. The measurements reveal the difficult to reach and beautiful structure present in this highly correlated system far from the Fermi surface.

Affiliated with

Also associated with

No associations

Rating

High Resolution Spectroscopy of Two-Dimensional Electron Systems does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with High Resolution Spectroscopy of Two-Dimensional Electron Systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High Resolution Spectroscopy of Two-Dimensional Electron Systems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-435468