In this work, the band structure of quasi-one-dimensional ${\mathrm{HfSe}}_3$ was investigated with nanospot angle-resolved photoemission spectroscopy (nano-ARPES) in both the $p$- and $s$-polarization geometries and with density functional theory calculations. ${\mathrm{HfSe}}_3$ has a rectangular surface Brillouin zone where the effective hole mass along the chain direction ($\overline{\mathrm{\Gamma }}$ to $\overline{\mathrm{Y}}$) measured with $p$-polarization geometry is $-0.27\pm 0.01{\mathrm{m}}_{\mathrm{e}}$, which is smaller than the effective hole mass along the direction perpendicular to the chains measured with $s$-polarization geometry ($\overline{\mathrm{\Gamma }}$ to $\overline{\mathrm{B}}$), $-1.17\pm 0.01{\mathrm{m}}_{\mathrm{e}}$, in agreement with the calculated hole masses of $-0.25{\mathrm{m}}_{\mathrm{e}}$ ($\overline{\mathrm{\Gamma }}$ to $\overline{\mathrm{Y}}$) and $-1.11{\mathrm{m}}_{\mathrm{e}}$ ($\overline{\mathrm{\Gamma }}$ to $\overline{\mathrm{B}}$), respectively. A band separation of $0.22\pm 0.01$ eV is observed at the top of the valence band in the experimental band structure along $\overline{\mathrm{\Gamma }}$ to $\overline{\mathrm{Y}}$. This band separation may be partly enhanced due to intrinsic spin-orbit coupling effects, as the band structure calculated with density functional theory shows a significant separation of 0.29 eV, for the two bands closest to the top of the valence band along $\overline{\mathrm{\Gamma }}$ to $\overline{\mathrm{Y}}$, only when spin-orbit interactions are included.

Close

PrevNext

View figure in article

• Density of states
• Spin-orbit coupling
• Surface states
• Transition metal trichalcogenides
• Angle-resolved photoemission spectroscopy
• Density functional theory