THz photodetector using sideband-modulated transport through surface states of a 3D topological insulator

Mondal, Puja; Ghosh, Sankalpa; Sharma, Manish

doi:10.1088/1361-648x/ab3d5e

Cited by 9 publications

(8 citation statements)

References 81 publications

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“…We note that an analogous study for the case of an oscillating potential barrier was carried out in Ref. 44; however, the optical control of conductance that we find in our study has not been obtained earlier.…”

Section: Introductionsupporting

confidence: 51%

Transport on a topological insulator surface with a time-dependent magnetic barrier

Udupa,

Sengupta,

Sen

2019

Preprint

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We study transport across a time-dependent magnetic barrier present on the surface of a three-dimensional topological insulator. We show that such a barrier can be implemented for Dirac electrons on the surface of a three-dimensional topological insulator by a combination of a proximate magnetic material and linearly polarized external radiation. We find that the conductance of the system can be tuned by varying the frequency and amplitude of the radiation and the energy of an electron incident on the barrier providing us optical control on the conductance of such junctions. We first study a δ-function barrier which shows a number of interesting features such as sharp peaks and dips in the transmission at certain angles of incidence. Approximate methods for studying the limits of small and large frequencies are presented. We then study a barrier with a finite width. This gives rise to some new features which are not present for a δ-function barrier, such as resonances in the conductance at certain values of the system parameters. We present a perturbation theory for studying the limit of large driving amplitude and use this to understand the resonances. Finally, we use a semiclassical approach to study transmission across a time-dependent barrier and show how this can qualitatively explain some of the results found in the earlier analysis. We discuss experiments which can test our theory.

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Section: Introductionsupporting

confidence: 51%

Transport on a topological insulator surface with a time-dependent magnetic barrier

Udupa,

Sengupta,

Sen

2019

Preprint

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“…Furthermore, upon light illumination with shorter wavelengths on the surface of rubrene/Bi 2 Te 3 heterojunction, the bounded-state (e–h) pairs are generated inside the rubrene film as well as the Bi 2 Te 3 film. Whereas, under the light-illumination situation with incoming energy of photons lower than the forbidden gap of rubrene film, the Bi 2 Te 3 film is actively involved in the absorbing of the incident photons and, therefore, creates a large number of photoinduced (e–h) pairs inside the hybrid heterojunction. − Then, the photoinduced (e–h) pairs are quickly split into unbound electrons and holes with the help of the built-in electrical field near the heterointerface, moving in opposite directions as displayed in Figure b. Now the electrons from the LUMO of rubrene can be transferred to the E c of Bi 2 Te 3 and are trapped within Bi 2 Te 3 , whereas the holes will be injected from the E v of Bi 2 Te 3 into the HOMO of rubrene.…”

Section: Resultsmentioning

confidence: 99%

High-Sensitivity Flexible Photodetectors Based on Bi₂Te₃/Rubrene Schottky Heterojunction with Superior Interface

Wali,

Su,

Shafi

et al. 2024

Crystal Growth & Design

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Recently, van der Waals organic−inorganic heterostructures (OIHs) have boosted significant interest in novel electronic and optoelectronic device applications due to their excellent properties. The integration of topological insulators and organic semiconductors to design novel OIHs may further improve device performance due to the presence of Dirac surface states at heterointerfaces. Thus, the high-quality rubrene (C 42 H 28 )/topological insulator (Bi 2 Te 3 ) OIHs were developed using a simple and low-cost physical vapor deposition approach. Because of the atomically flat interface and robust Schottky potential, this newly designed OIH is very beneficial for the fabrication of optoelectronic devices with superior critical parameters. The transport results proved that the as-fabricated OIH photodetector (OIHPD) demonstrated excellent diode behavior in the dark and remarkable photovoltaic capabilities under light illumination. Due to the broadband absorption efficiency of the heterojunction, the detection range of the OIHPD can be broadened from visible to near-infrared lights. Notably, the device demonstrated a higher photoresponsivity of 852.7 A•W −1 , a higher photodetectivity of 1.42 × 10 13 Jones, ultrafast response speed with rising time (14 μs), and decaying time (16.2 μs) under a 1064 nm laser. These findings have proven potential opportunities for engineering the emerging next generation of broadband flexible photodetectors for boosting the optical detection domain.

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“…We have already seen in section 3 that periodic driving can have significant effects on topological systems. Further, periodic driving can also have interesting effects on electronic transport in such systems [79,80]. One way to produce such driving is to apply electromagnetic radiation of a particular frequency on the system.…”

Section: Transport On Surfaces Of Topological Insulatorsmentioning

confidence: 99%

Driven quantum many-body systems and out-of-equilibrium topology

Bandyopadhyay

Bhattacharjee

Sen

2021

J. Phys.: Condens. Matter

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In this review we present some of the work done in India in the area of driven and out-of-equilibrium systems with topological phases. After presenting some well-known examples of topological systems in one and two dimensions, we discuss the effects of periodic driving in some of them. We discuss the unitary as well as the non-unitary dynamical preparation of topologically non-trivial states in one and two dimensional systems. We then discuss the effects of Majorana end modes on transport through a Kitaev chain and a junction of three Kitaev chains. Following this, transport through the surface states of a three-dimensional topological insulator has also been reviewed. The effects of hybridization between the top and bottom surfaces in such systems and the application of electromagnetic radiation on a strip-like region on the top surface are described. Two unusual topological systems are mentioned briefly, namely, a spin system on a kagome lattice and a Josephson junction of three superconducting wires. We have also included a pedagogical discussion on topology and topological invariants in the appendices, where the connection between topological properties and the intrinsic geometry of many-body quantum states is also elucidated.

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THz photodetector using sideband-modulated transport through surface states of a 3D topological insulator

Cited by 9 publications

References 81 publications

Transport on a topological insulator surface with a time-dependent magnetic barrier

Transport on a topological insulator surface with a time-dependent magnetic barrier

High-Sensitivity Flexible Photodetectors Based on Bi₂Te₃/Rubrene Schottky Heterojunction with Superior Interface

Driven quantum many-body systems and out-of-equilibrium topology

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THz photodetector using sideband-modulated transport through surface states of a 3D topological insulator

Cited by 9 publications

References 81 publications

Transport on a topological insulator surface with a time-dependent magnetic barrier

Transport on a topological insulator surface with a time-dependent magnetic barrier

High-Sensitivity Flexible Photodetectors Based on Bi2Te3/Rubrene Schottky Heterojunction with Superior Interface

Driven quantum many-body systems and out-of-equilibrium topology

Contact Info

Product

Resources

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High-Sensitivity Flexible Photodetectors Based on Bi₂Te₃/Rubrene Schottky Heterojunction with Superior Interface