99 research outputs found
Protocols for characterizing quantum transport through nano-structures
In this work, we have analyzed the exact closed-form solutions for transport
quantities through a mesoscopic region which may be characterized by a
polynomial functional of resonant transmission functions. These are then
utilized to develop considerably improved protocols for parameters relevant for
quantum transport through molecular junctions and quantum dots. The protocols
are shown to be experimentally feasible and should yield the parameters at much
higher resolution than the previously proposed ones.Comment: 5 pages, 2 figure
Preformed excitonic liquid route to a charge density wave in 2H-TaSe
Recent experiments on 2H-TaSe contradict the long-held view of the charge
density wave arising from a nested band structure. An intrinsically strong
coupling view, involving a charge density wave state arising as a Bose
condensation of preformed excitons emerges as an attractive, albeit scantily
investigated alternative. Using local density approximation plus multiorbital
dynamic mean-field theory, we show that this scenario agrees with a variety of
normal state data for 2H-TaSe. Based thereupon, the ordered states in a
subset of dichalcogenides should be viewed as instabilities of a correlated,
preformed excitonic liquid.Comment: 4 pages,8 figure
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