Tunable two-dimensional electron gas at the surface of thermoelectric material In${}_4$Se${}_3$

Abstract

We report the discovery of two-dimensional electron gas (2DEG) at the surface of thermoelectric material In${}_4$Se${}_3$ by angle-resolved photoemission spectroscopy. The observed 2DEG exhibits a nearly isotropic band dispersion with a considerably small effective mass of m* = 0.16 m_0, and its carrier density shows a significant temperature dependence, leading to unconventional metal-semiconductor transition at the surface. The observed wide-range thermal tunability of 2DEG in In${}_4$Se${}_3$ gives rise to additional degrees of freedom to better control the surface carriers of semiconductors.

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Cited by in corpus (2)

• Quantum Confinement and Electronic Structure at the Surface of van der Waals Ferroelectric α-In${}_2$Se${}_3$
• Observation of Dirac Charge Density Waves in Bi${}_2$Te${}_2$Se