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Band-gap model (blue dotted line), the Urbach-tail extension (red dotted line), and the band-gap model with Urbach tail (black solid line). In the solid-state physics of semiconductors, the Urbach tail is an exponential part in the energy spectrum of the absorption coefficient. This tail appears near the optical band edge in amorphous ...
In some materials, for example, in graphene and zigzag graphene quantum dot, there exists the energy states having energy eigenvalues exactly equal to zero (E=0) besides the conduction and valence bands. These states are called edge states which modifies the electronic and optical properties of the materials significantly. [3] [4] [5] [6]
Electronic properties of graphene. Sigma and pi bonds in graphene. Sigma bonds result from an overlap of sp 2 hybrid orbitals, whereas pi bonds emerge from tunneling between the protruding p z orbitals. For clarity, only one p z orbital is shown with its three nearest neighbors. Graphene is a semimetal whose conduction and valence bands meet at ...
Nature Reviews Molecular Cell Biology. Nature Reviews Nephrology. Nature Reviews Neurology. Nature Reviews Neuroscience. Nature Reviews Physics. Nature Reviews Psychology. Nature Reviews Rheumatology. Nature Reviews Urology. The Nature Partner Journals series, abbreviated npj, is a series of online-only, open access, journals.
Previous ACS research had shown that rates of 11 cancers, including pancreatic, colorectal, kidney, uterine and testicular cancer, had been increasing among young adults. The new study added eight ...
Rape. Sociobiological theories of rape explore how evolutionary adaptation influences the psychology of rapists. Such theories are highly controversial, as traditional theories typically do not consider rape a behavioral adaptation. Some object to such theories on ethical, religious, political, or scientific grounds.
This overrated picture book thus presents as a paradigm for young children a callously exploitative human relationship — both across genders and across generations. It perpetuates the myth of the selfless, all-giving mother who exists only to be used and the image of a male child who can offer no reciprocity, express no gratitude, feel no ...
A pseudogap can be seen with several different experimental methods. One of the first observations was in NMR measurements of YBa 2 Cu 3 O 6+x by H. Alloul et al. and by specific heat measurements by Loram et al. The pseudogap is also apparent in ARPES (Angle Resolved Photoemission Spectroscopy) and STM (Scanning tunneling microscope) data, which can measure the density of states of the ...