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(a) Structure of a hexagonal TMD monolayer. M atoms are in black and X atoms are in yellow. (b) A hexagonal TMD monolayer seen from above. Transition-metal dichalcogenide (TMD or TMDC) monolayers are atomically thin semiconductors of the type MX 2, with M a transition-metal atom (Mo, W, etc.) and X a chalcogen atom (S, Se, or Te).
The main alternative structure for the monochalcogenides is the wurtzite structure wherein the atom connectivities are similar (tetrahedral), but the crystal symmetry is hexagonal. A third motif for metal monochalcogenide is the nickel arsenide lattice, where the metal and chalcogenide each have octahedral and trigonal prismatic coordination ...
Ferecrystals can be prepared using the Modulated Elemental Reactants (MER) method. Developed by David C. Johnson and his team at the University of Oregon, this technique allows for the creation of ferecrystals of arbitrary n and m, unlike commonly used synthesis techniques.
MXenes adopt three structures with one metal on the M site, as inherited from the parent MAX phases: M 2 C, M 3 C 2, and M 4 C 3.They are produced by selectively etching out the A element from a MAX phase or other layered precursor (e.g., Mo 2 Ga 2 C), which has the general formula M n+1 AX n, where M is an early transition metal, A is an element from group 13 or 14 of the periodic table, X is ...
A two-dimensional semiconductor (also known as 2D semiconductor) is a type of natural semiconductor with thicknesses on the atomic scale. Geim and Novoselov et al. initiated the field in 2004 when they reported a new semiconducting material graphene, a flat monolayer of carbon atoms arranged in a 2D honeycomb lattice. [1]
II-VI semiconductor compounds are compounds composed of a metal from either group 2 or 12 of the periodic table (the alkaline earth metals and group 12 elements, formerly called groups IIA and IIB) and a nonmetal from group 16 (the chalcogens, formerly called group VI).
Transmons have been explored for use as d-dimensional qudits via the additional energy levels that naturally occur above the qubit subspace (the lowest two states). For example, the lowest three levels can be used to make a transmon qutrit; in the early 2020s, researchers have reported realizations of single-qutrit quantum gates on transmons [10] [11] as well as two-qutrit entangling gates. [12]
Electronic band structure of graphene. Valence and conduction bands meet at the six vertices of the hexagonal Brillouin zone and form linearly dispersing Dirac cones. When atoms are placed onto the graphene hexagonal lattice, the overlap between the p z (π) orbitals and the s or the p x and p y orbitals is zero by symmetry.