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Vibrational dynamics and surface structure of amorphous selenium
Defining the structure of amorphous solids is a challenge because of their lack of structural order. In this study, the authors combine experiment and theory to analyse the surface of amorphous selenium, and show that the differences between surface and bulk are attributable to a particular type of coordination defect.
- T. Scopigno
- , W. Steurer
- & T. Wagner
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Pseudogap in a thin film of a conventional superconductor
In high-temperature superconductors, a very low density of states, the pseudogap, exists even above the critical temperature. Here, the authors show that this is also the case for a conventional superconductor, titanium nitride thin films, and that this pseudogap is induced by superconducting fluctuations.
- Benjamin Sacépé
- , Claude Chapelier
- & Marc Sanquer
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Coexistence of the topological state and a two-dimensional electron gas on the surface of Bi2Se3
Topological insulators are materials with an insulating interior and a metallic surface. In this study the authors demonstrate that the topological state can coexist with a two-dimensional electron gas state, a feature important in semiconductors used for electronic applications.
- Marco Bianchi
- , Dandan Guan
- & Philip Hofmann
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Creation of a two-dimensional electron gas at an oxide interface on silicon
The integration of oxide nanoelectronics with silicon platforms is a necessary step for the fabrication of ultrahigh-density devices. Here, the authors grow a LaAlO3/SrTiO3interface directly on silicon, and show the reversible creation of a two-dimensional electron gas confined within nanowires located on the surface.
- J.W. Park
- , D.F. Bogorin
- & C.B. Eom