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Infrared Spectroscopy of the Topological Surface States of Bi2Se3 by Use of the Berreman Effect

https://doi.org/10.1103/PhysRevLett.121.176803

Falsetti, Enrico ; Nucara, Alessandro ; Shibayev, Pavel P. ; Salehi, Maryam ; Moon, Jisoo ; Oh, Seongshik ; Brubach, Jean-Blaise ; Roy, Pascale ; Ortolani, Michele ; Calvani, Paolo ( October 2018 , Physical Review Letters)
Electric field modulated topological magnetoelectric effect in Bi2Se3

https://doi.org/10.1103/PhysRevB.98.121106

Mondal, Mintu ; Chaudhuri, Dipanjan ; Salehi, Maryam ; Wan, Cheng ; Laurita, N. J. ; Cheng, Bing ; Stier, Andreas V. ; Quintero, Michael A. ; Moon, Jisoo ; Jain, Deepti ; et al ( September 2018 , Physical Review B)
Stability of low-carrier-density topological-insulator Bi 2 Se 3 thin films and effect of capping layers

https://doi.org/10.1063/1.4931767

Salehi, Maryam ; Brahlek, Matthew ; Koirala, Nikesh ; Moon, Jisoo ; Wu, Liang ; Armitage, N. P. ; Oh, Seongshik ( September 2015 , APL Materials)
Disorder-driven topological phase transition in Bi2Se3 films

https://doi.org/10.1103/PhysRevB.94.165104

Brahlek, Matthew ; Koirala, Nikesh ; Salehi, Maryam ; Moon, Jisoo ; Zhang, Wenhan ; Li, Haoxiang ; Zhou, Xiaoqing ; Han, Myung-Geun ; Wu, Liang ; Emge, Thomas ; et al ( October 2016 , Physical Review B)
Quantum‐Hall to Insulator Transition in Ultra‐Low‐Carrier‐Density Topological Insulator Films and a Hidden Phase of the Zeroth Landau Level

https://doi.org/10.1002/adma.201901091

Salehi, Maryam ; Shapourian, Hassan ; Rosen, Ilan Thomas ; Han, Myung‐Geun ; Moon, Jisoo ; Shibayev, Pavel ; Jain, Deepti ; Goldhaber‐Gordon, David ; Oh, Seongshik ( July 2019 , Advanced Materials)

Abstract
A key feature of the topological surface state under a magnetic field is the presence of the zeroth Landau level at the zero energy. Nonetheless, it is challenging to probe the zeroth Landau level due to large electron–hole puddles smearing its energy landscape. Here, by developing ultra‐low‐carrier density topological insulator Sb₂Te₃films, an extreme quantum limit of the topological surface state is reached and a hidden phase at the zeroth Landau level is uncovered. First, an unexpected quantum‐Hall‐to‐insulator‐transition near the zeroth Landau level is discovered. Then, through a detailed scaling analysis, it is found that this quantum‐Hall‐to‐insulator‐transition belongs to a new universality class, implying that the insulating phase discovered here has a fundamentally different origin from those in nontopological systems.

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