Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-02-01
Phys.Rev.Lett.105:255302,2010
Physics
Condensed Matter
Quantum Gases
11 pages, 6 figures
Scientific paper
10.1103/PhysRevLett.105.255302
Topological insulators are a broad class of unconventional materials that are insulating in the interior but conduct along the edges. This edge transport is topologically protected and dissipationless. Until recently, all existing topological insulators, known as quantum Hall states, violated time-reversal symmetry. However, the discovery of the quantum spin Hall effect demonstrated the existence of novel topological states not rooted in time-reversal violations. Here, we lay out an experiment to realize time-reversal topological insulators in ultra-cold atomic gases subjected to synthetic gauge fields in the near-field of an atom-chip. In particular, we introduce a feasible scheme to engineer sharp boundaries where the "edge states" are localized. Besides, this multi-band system has a large parameter space exhibiting a variety of quantum phase transitions between topological and normal insulating phases. Due to their unprecedented controllability, cold-atom systems are ideally suited to realize topological states of matter and drive the development of topological quantum computing.
Bermudez Alejandro
Goldman Nathan
Lewenstein Maciej
Martin-Delgado Miguel Angel
Nikolic Predrag
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