تقرير
Tunable quantum spin Hall effect in double quantum wells
| العنوان: | Tunable quantum spin Hall effect in double quantum wells |
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| المؤلفون: | Michetti, Paolo, Budich, Jan C., Novik, Elena G., Recher, Patrik |
| المصدر: | Physical Review B 85, 125309 (2012) |
| سنة النشر: | 2011 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science |
| الوصف: | The field of topological insulators (TIs) is rapidly growing. Concerning possible applications, the search for materials with an easily controllable TI phase is a key issue. The quantum spin Hall effect, characterized by a single pair of helical edge modes protected by time-reversal symmetry, has been demonstrated in HgTe-based quantum wells (QWs) with an inverted bandgap. We analyze the topological properties of a generically coupled HgTe-based double QW (DQW) and show how in such a system a TI phase can be driven by an inter-layer bias voltage, even when the individual layers are non-inverted. We argue, that this system allows for similar (layer-)pseudospin based physics as in bilayer graphene but with the crucial absence of a valley degeneracy. Comment: 9 pages, 8 figures, extended version (accepted Phys. Rev. B) |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.85.125309 |
| الوصول الحر: | http://arxiv.org/abs/1107.4108Test |
| رقم الانضمام: | edsarx.1107.4108 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.85.125309 |
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