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Description
One-dimensional (1D) materials are important model systems. We present a high energy resolution ARPES study of NbSe$_{\mathrm{3}}$, a quasi-1D bulk material exhibiting three-dimensional charge density wave (CDW) phases at low temperature. Synchrotron measurements reveal CDW gaps in the electronic structure at energies well below the Fermi level ($E_{\mathrm{F}}$) [1], while ultra-high energy resolution laser ARPES at 6 eV uncovers previously obscured gaps at $E_{\mathrm{F}}$. A comparison to spectral function calculations highlights the importance of inter-chain coupling in the CDW formation. Concurrently we observe a change in the dimensional behavior of NbSe$_{\mathrm{3}}$ with temperature and extract the crossover energy scale [1]. Such considerations are generally applicable to low-dimensional materials.
- C. W. Nicholson $\textit{et al.}$, Phys. Rev. Lett. 118, 206401 (2017).
