Peierls-like phase transitions in domain walls

Metallic Twin Grain Boundaries Embedded in MoSe2 Monolayers Grown by Molecular Beam Epitaxy

“…Such an instability opens a band gap; that is, below a critical temperature a metal-to-insulator transition should be observed, which is generally known as a Peierls transition in 1D metals. 12 The formation of a charge density wave and opening of a gap in the grain boundaries of MoSe 2 were first demonstrated by low-temperature STM studies. 13 The work by some of the authors of this article showed that the observed charge density wave periodicity measured in STM is consistent with the Fermi wave vector (nesting vector) measured directly by angle-resolved photoemission spectroscopy (ARPES).…”

“…One consequence of one-dimensional metals is their instability toward a charge density wave transition due to the perfect nesting condition at the Fermi surface of a 1D metal; that is, the entire Fermi surface can be translated on each other with a single wave vector. Such an instability opens a band gap; that is, below a critical temperature a metal-to-insulator transition should be observed, which is generally known as a Peierls transition in 1D metals . The formation of a charge density wave and opening of a gap in the grain boundaries of MoSe 2 were first demonstrated by low-temperature STM studies .…”