364 citations · 1.1k across the 26 of their papers we have counts for
26 papers
Signatures of Majorana Bound States in the Diffraction Patterns of Extended Superconductor-Topological Insulator-Superconductor Josephson Junctions
Guang Yue, Can Zhang, Erik D. Huemiller +13
In an extended superconductor-topological insulator-superconductor (S-TI-S) Josephson junction in a magnetic field, localized Majorana bound states (MBS) are predicted to exist at…
A new type of cyclotron resonance from charge-impurity scattering in the bulk-insulating BiSe thin films
Xingyue Han, Maryam Salehi, Seongshik Oh +1
This work focuses on the low frequency Drude response of bulk-insulating topological insulator BiSe films. The frequency and field dependence of the mobility and carrier de…
From classical to quantum regime of topological surface states via defect engineering
Maryam Salehi, Xiong Yao, Seongshik Oh
Since the notion of topological insulator (TI) was envisioned in late 2000s, topology has become a new paradigm in condensed matter physics. Realization of topology as a generic pr…
Ambipolar magneto-optical response of ultra-low carrier density topological insulators
Dipanjan Chaudhuri, Maryam Salehi, Sayak Dasgupta +5
We have investigated the THz range magneto-optical response of ultralow carrier density films of SbTe using time-domain THz polarimetry. Undoped SbTe has a chemical…
Electron-Hole Asymmetry of Surface States in Topological Insulator Sb2Te3 Thin Films Revealed by Magneto-Infrared Spectroscopy
Yuxuan Jiang, Mahmoud M. Asmar, Xingyue Han +7
When surface states (SSs) form in topological insulators (TIs), they inherit the properties of bulk bands, including the electron-hole (e-h) asymmetry but with much more profound i…
Ferromagnetic Anomalous Hall Effect in Cr-doped BiSe Thin Films via Surface-State Engineering
Jisoo Moon, Jinwoong Kim, Nikesh Koirala +3
The anomalous Hall effect (AHE) is a non-linear Hall effect appearing in magnetic conductors, boosted by internal magnetism beyond what is expected from the ordinary Hall effect. W…
Absence of strong localization at low conductivity in the topological surface state of low disorder Sb2Te3
Ilan T. Rosen, Indra Yudhistira, Gargee Sharma +5
We present low-temperature transport measurements of a gate-tunable thin film topological insulator system that features high mobility and low carrier density. Upon gate tuning to…
Gate tunable quantum Hall effects in defect-suppressed Bi2Se3 films
N. Koirala, M. Salehi, J. Moon +1
Despite many years of efforts, attempts to reach the quantum regime of topological surface states (TSS) on an electrically tunable topological insulator (TI) platform have so far f…
Quantum-Hall to Insulator Transition in Ultra-low-carrier-density Topological Insulator Films and a Hidden Phase of the Zeroth Landau Level
Maryam Salehi, Hassan Shapourian, Ilan Thomas Rosen +6
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 has been challenging to probe t…
Engineering artificial topological phases via superlattices
Pavel P. Shibayev, Elio J. König, Maryam Salehi +3
The search for new topological materials and states of matter is presently at the forefront of quantum materials research. One powerful approach to novel topological phases beyond…
Electric field modulated topological magnetoelectric effect in BiSe
Mintu Mondal, Dipanjan Chaudhuri, Maryam Salehi +11
Topological insulators have been predicted to exhibit a variety of interesting phenomena including a quantized magnetoelectric response and novel spintronics effects due to spin te…
Dirac surface states in superconductors: a dual topological proximity effect
Nicholas Sedlmayr, E. W. Goodwin, Michael Gottschalk +12
In this paper we present scanning tunneling microscopy of BiSe with superconducting Nb deposited on the surface. We find that the topologically protected surface states of…
Solution to the hole-doping problem and tunable quantum Hall effect in BiSe thin films
Jisoo Moon, Nikesh Koirala, Maryam Salehi +3
BiSe, one of the most widely studied topological insulators (TIs), is naturally electron-doped due to n-type native defects. However, many years of efforts to achieve p…
Coexistence of bulk and surface states probed by Shubnikov-de Haas oscillations in BiSe with high charge-carrier density
E. K. de Vries, S. Pezzini, M. J. Meijer +6
Topological insulators are ideally represented as having an insulating bulk with topologically protected, spin-textured surface states. However, it is increasingly becoming clear t…
Nonvolatile Solid-State Charged-Polymer Gating of Topological Insulators into the Topological Insulating Regime
R. M. Ireland, Liang Wu, M. Salehi +3
We demonstrate the ability to reduce the carrier concentration of thin films of the topological insulator (TI) Bi2Se3 by utilizing a novel approach, namely non-volatile electrostat…
Surface vibrational modes of the topological insulator BiSe observed by Raman spectroscopy
H. -H. Kung, M. Salehi, I. Boulares +10
We present polarization resolved Raman scattering study of surface vibration modes in the topological insulator BiSe single crystal and thick films. Besides the four Raman…
Disorder-driven topological phase transition in Bi2Se3 films
Matthew Brahlek, Nikesh Koirala, Maryam Salehi +16
Topological insulators (TI) are a phase of matter that host unusual metallic states on their surfaces. Unlike the states that exist on the surface of conventional materials, these…
Finite-size and composition-driven topological phase transition in (BiIn)Se thin films
Maryam Salehi, Hassan Shapourian, Nikesh Koirala +3
In a topological insulator (TI), if its spin-orbit coupling (SOC) strength is gradually reduced, the TI eventually transforms into a trivial insulator beyond a critical point of SO…
Tunable inverse topological heterostructure utilizing
Matthew Brahlek, Nikesh Koirala, Jianpeng Liu +6
In typical topological insulator (TI) systems the TI is bordered by a non-TI insulator, and the surrounding conventional insulators, including vacuum, are not generally treated as…
Quantized Faraday and Kerr rotation and axion electrodynamics of a 3D topological insulator
Liang Wu, M. Salehi, N. Koirala +3
Topological insulators have been proposed to be best characterized as bulk magnetoelectric materials that show response functions quantized in terms of fundamental physical constan…
Tuning and Stabilizing Topological Insulator Bi2Se3 in the Intrinsic Regime by Charge Extraction with Organic Overlayers
Liang Wu, R. M. Ireland, M. Salehi +5
In this work, we use charge extraction via organic overlayer deposition to lower the chemical potential of topological insulator Bi2Se3 thin films into the intrinsic (bulk-insulati…
Record Surface State Mobility and Quantum Hall Effect in Topological Insulator Thin Films via Interface Engineering
Nikesh Koirala, Matthew Brahlek, Maryam Salehi +11
Material defects remain as the main bottleneck to the progress of topological insulators (TIs). In particular, efforts to achieve thin TI samples with dominant surface transport ha…
Towards the understanding of the origin of charge-current-induced spin voltage signals in the topological insulator BiSe
E. K. de Vries, A. M. Kamerbeek, N. Koirala +5
Topological insulators provide a new platform for spintronics due to the spin texture of the surface states that are topologically robust against elastic backscattering. Here, we r…
Stability of low-carrier-density topological-insulator BiSe thin films and effect of capping layers
Maryam Salehi, Matthew Brahlek, Nikesh Koirala +4
Although over the past number of years there have been many advances in the materials aspects of topological insulators (TI), one of the ongoing challenges with these materials is…