2018/12/31 by Lei Hao, Hong‐Yan Lu, Hong-Yan Lu +1 · 10 citations
Computer Science · Materials Science · Physics and Astronomy · #Band gap #Condensed matter physics #Degenerate energy levels #Density functional theory #Graphane #Graphene #Graphene research and applications #Lattice (music) #Materials science #Molecular physics #Nanotechnology #Optoelectronics #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum and electron transport phenomena #Quantum computer #Quantum mechanics #Qubit #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevmaterials.3.024003
published in Physical Review Materials 3(2) (American Physical Society) · 14 pages, 4 figures
openalex created_date 2018/12/22 · openalex publication_date 2019/02/15 · arxiv created 2019/02/16 · arxiv updated 2019/02/19 · openalex updated_date 2026/08/05
We study the energy level structures of the defective graphane lattice, where a carbon dimer defect is created by removing the hydrogen atoms on two nearest-neighbor carbon sites. Robust defect states emerge inside the bulk insulating gap of graphane. While for the stoichiometric half-filled system there are two doubly degenerate defect levels, there are four nondegenerate and spin-polarized in-gap defect levels in the system with one electron less than half filling. A universal set of quantum gates can be realized in the defective graphane lattice, by triggering resonant transitions among the defect states via optical pulses and ac magnetic fields. The sizable energy separation between the occupied and the empty in-gap states enables precise control at room temperature. The spatial locality of the in-gap states implies a qubit network of extremely high areal density. Based on these results, we propose that graphane as a unique platform could be used to construct the future all-purpose quantum computers.