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Hexagonally deformed Fermi surfaces and strong nesting, found in topologicalinsulators (TIs) such as $Bi_2Se_3$ and $Bi_2Te_3$, have led to severalpredictions of the existence of Density Wave order in these systems. Recentevidence for strong Fermi surface nesting in superconducting $Cu-Bi_2Se_3$ and$Nb-Bi_2Se_3$ has further led to speculation about the importance of chargeorder in the context of unconventional superconductivity. Here, we report thefirst observation of a novel anomaly in $Bi_2Se_3$ at 140K, which may beassociated with a Charge Density Wave (CDW)-like transition. This transitionwas identified from both structural and electronic measurements, where: a) aperiodic lattice distortion at above room temperature was characterized as adiffuse charge order in $Bi_2Se_3$ between \vec{k} and\vec{k}\pm\mathrm{\Delta}\vec{k} from electron diffraction; and b) an openingof energy gap signatured with metal-to-insulator like transition at 140K wasidentified from resistivity vs temperature measurement. This is furthercorroborated by nuclear magnetic resonance (NMR) studies of the spin-latticerelaxation ( $\frac{1}{T_1}$) rate of the $^{209}Bi$ nucleus, which alsodisplays a transition at 140K associated with an opening of an energy gap of~8meV. Additionally, we also observe another anomaly in $\frac{1}{T_1}$ near200K, which appears to display anisotropy with the direction of the appliedmagnetic field.

A Charge Density Wave-like Transition in High Temperature Quenched $Bi_2Se_3$