The photon-assisted tunneling (PAT) through a single wall carbon nanotube quantum well (QW) is suggested for probing the Tomonaga-Luttinger liquid (TLL) state. The elementary TLL excitations inside the quantum well are density (ρ±) and spin (σ±) bosons. The bosons populate the quantized energy levels εn ρ+ =Δn/g and εn ρ- (σ±)=Δn where Δ=h vF/L is the interlevel spacing, n is an integer number, L is the tube length, and g is the TLL parameter. Since the external electromagnetic field acts on the ρ+ bosons only whereas the neutral ρ- and σ± bosons remain unaffected, the PAT spectroscopy is able of identifying the ρ+ levels in the QW setup. The spin εn σ+ boson levels in the same QW are recognized from Zeeman splitting when applying a dc magnetic field H≠0. Basic TLL parameters are readily extracted from the differential conductivity curves.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Dec 1 2008|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics