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000276159 1001_ $$0P:(DE-Juel1)145534$$aEschbach, Markus$$b0
000276159 245__ $$aRealization of a vertical topological p–n junction in epitaxial Sb$_{2}$Te$_{3}$/Bi$_{2}$Te$_{3}$ heterostructures
000276159 260__ $$aLondon$$bNature Publishing Group$$c2015
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000276159 520__ $$aThree-dimensional (3D) topological insulators are a new state of quantum matter, which exhibits both a bulk band structure with an insulating energy gap as well as metallic spin-polarized Dirac fermion states when interfaced with a topologically trivial material. There have been various attempts to tune the Dirac point to a desired energetic position for exploring its unusual quantum properties. Here we show a direct experimental proof by angle-resolved photoemission of the realization of a vertical topological p–n junction made of a heterostructure of two different binary 3D TI materials Bi2Te3 and Sb2Te3 epitaxially grown on Si(111). We demonstrate that the chemical potential is tunable by about 200 meV when decreasing the upper Sb2Te3 layer thickness from 25 to 6 quintuple layers without applying any external bias. These results make it realistic to observe the topological exciton condensate and pave the way for exploring other exotic quantum phenomena in the near future.
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000276159 7001_ $$0P:(DE-HGF)0$$aMłyńczak, Ewa$$b1
000276159 7001_ $$0P:(DE-HGF)0$$aKellner, Jens$$b2
000276159 7001_ $$0P:(DE-Juel1)145467$$aKampmeier, Jörn$$b3
000276159 7001_ $$0P:(DE-Juel1)156236$$aLanius, Martin$$b4
000276159 7001_ $$0P:(DE-Juel1)156529$$aNeumann, Elmar$$b5
000276159 7001_ $$0P:(DE-Juel1)145705$$aWeyrich, Christian$$b6
000276159 7001_ $$0P:(DE-Juel1)161368$$aGehlmann, Mathias$$b7
000276159 7001_ $$0P:(DE-Juel1)167375$$aGospodarič, Pika$$b8
000276159 7001_ $$0P:(DE-Juel1)144959$$aDöring, Sven$$b9
000276159 7001_ $$0P:(DE-Juel1)128617$$aMussler, Gregor$$b10
000276159 7001_ $$0P:(DE-Juel1)125576$$aDemarina, Nataliya$$b11
000276159 7001_ $$0P:(DE-Juel1)130811$$aLuysberg, Martina$$b12
000276159 7001_ $$0P:(DE-Juel1)130545$$aBihlmayer, Gustav$$b13
000276159 7001_ $$0P:(DE-Juel1)128634$$aSchäpers, Thomas$$b14
000276159 7001_ $$0P:(DE-Juel1)130895$$aPlucinski, Lukasz$$b15$$eCorresponding author
000276159 7001_ $$0P:(DE-Juel1)130548$$aBlügel, Stefan$$b16
000276159 7001_ $$0P:(DE-HGF)0$$aMorgenstern, Markus$$b17
000276159 7001_ $$0P:(DE-Juel1)130948$$aSchneider, Claus M.$$b18
000276159 7001_ $$0P:(DE-Juel1)125588$$aGrützmacher, Detlev$$b19
000276159 773__ $$0PERI:(DE-600)2553671-0$$a10.1038/ncomms9816$$gVol. 6, p. 8816 -$$p8816$$tNature Communications$$v6$$x2041-1723$$y2015
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