Generalized model for the charge transport properties of dressed quantum Hall systems

Herath, Kosala; Premaratne, Malin

doi:10.1103/physrevb.105.035430

Cited by 8 publications

(9 citation statements)

References 93 publications

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“…When static uniform electric field (F s ) is applied along QWr's axis, it breaks the confining potential symmetry which in turn leads to mixing of symmetric and antisymmetric electron and hole basis states in equation (24). Consequently, neighboring energy levels of different parities for F s = 0, now for F s ̸ = 0, may mutually interact developing the avoided crossings in energy spectra due to static Stark effect what is shown in figure 7(a).…”

Section: Static and Dynamical Stark Effects In Narrow Qwrmentioning

confidence: 99%

“…In two-dimensional materials hosting Dirac fermions, the offresonant circularly polarized laser light modify the energy band structure by flattening the bands [15,16] and opening the non-trivial topological gaps [17][18][19][20][21]. Such metal-topological insulator phase transitions dramatically changes charge density and the character of electron transport due to formation of the edge states and the light helicity dependent valley polarization [22][23][24][25], while an artificial gauge field generated by circularly polarized light in a momentum space drives the electrons giving contribution to anomalous Hall effect or in materials with prominent spin-orbit interactions to spin Hall effect [26][27][28][29][30]. For the same reason the persistent currents without external bias are observed due to the photogalvanic effect while for much stronger laser intensities the Dirac fermions can be temporarily spatially localized [31,32].…”

Section: Introductionmentioning

confidence: 99%

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Excitonic Floquet states in quantum wire

Chwiej,

Dziembaj

2023

J. Phys.: Condens. Matter

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Floquet engineering is a rapidly growing branch in condensed matter physics which allows to change the properties of nanomaterials like energy structure, conductivity, magnetization, topology, etc. on demand utilizing the electric and magnetic components of THz light ﬁeld coupling with charge and spin of electrons and holes. Here we use the Floquet theory to study the dynamical eﬀects of laser light coupling to an electron-hole pair conﬁned in a quantum wire. Due to much stronger conﬁnement of particles in transverse direction than in longitudinal one, excitonic states becomes signiﬁcantly susceptible to electric ﬁeld oscillating along the wire, the energies of the bound states grow while their probabilities of radiative recombination are gradually decreased for increasing light ﬁeld intensities in moderate regime (I < 105 W/cm2). This eﬀect can be further enhanced by combining both, the oscillating in time and static electric ﬁelds applied along the wire. Then, some pairs of energy levels may mutually mix and undergo fast symmetry transformations as function of oscillating ﬁeld intensity, hence creating narrow (∼ few meV) avoided crossings accompanied with large changes in recombination probability, their positions in energy spectra can be precisely manipulated by tuning the strength of static electric ﬁeld. Described mechanism of changing the bright states into the dark ones is made with the help of laser ﬁeld so it could be advantageous to use this property to build the fast (∼ THz) optical bright-dark state switcher for an exciton in the most populated ground state.most populated ground state.

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Section: Static and Dynamical Stark Effects In Narrow Qwrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Excitonic Floquet states in quantum wire

Chwiej,

Dziembaj

2023

J. Phys.: Condens. Matter

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“…By appropriately choosing the drive frequency, amplitude, and polarization, periodic driving can be used to change the topological features of electronic system's quantum states, which govern the evolution of electrons in both space and time [57]. This opens up the possibility of altering the physical properties of quantum many-body systems, including two-dimensional (2D) materials such as graphene and transition metal dichalcogenides, as well as threedimensional (3D) topological insulators and thin metal films [58][59][60]. In these novel non-equilibrium quantum phenomena, the matter and light are considered as constituent elements of a composite quantum system known as a dressed system.…”

Section: Introductionmentioning

confidence: 99%

Investigating the impact of polarization on surface plasmon polariton characteristics in plasmonic waveguides under periodic driving fields

Herath,

Gunapala,

Premaratne

2024

Phys. Scr.

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This study delves into the effects of polarization on surface plasmon polariton (SPP) modes within plasmonic waveguides when subjected to periodic driving fields. Addressing a significant knowledge gap in the existing literature, we present a comprehensive investigation employing Floquet engineering techniques, with a specific emphasis on elliptically polarized fields as the dressing field. Our analysis reveals that the use of generalized Floquet states allows us to derive Floquet states for specific polarized dressing fields, such as linear, left-handed circular, and right-handed circular polarization. Remarkably, we demonstrate that Floquet states depend on the chirality of the dressing field's polarization. Employing the Floquet-Fermi golden rule, we assess electron transport under various polarization types and find that the specific polarization type influence electron transport properties. However, we establish that the chirality of the polarization of the dressing field does not impact the transport properties. During our numerical analysis, we assess the alterations in SPP characteristics arising from two distinct types of polarization in dressing fields: linear polarization and circular polarization. Our results underscore the potential of employing a dressing field to effectively mitigate the propagation losses of SPPs in plasmonic metals, with the extent of improvement contingent on the specific polarization type. To quantify the performance enhancements of commonly used plasmonic metals under linearly and circularly polarized dressing fields, we employ a figure of merit (FoM). This study offers insights into the practical utilization of periodic driving fields as a powerful tool in advancing plasmonic communication within chip-scale environments.

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“…Recently, applying light-matter interaction to manipulate solid-state systems has become a central focus of research. This approach has gained significant interest due to its potential to induce novel quantum phases that are not achievable in equilibrium [39][40][41]. By employing powerful periodic drives, such as ultra-fast optical pulses, one can modify the quantum state of electronic or atomic degrees of freedom and influence the underlying microscopic interactions.…”

Section: Introductionmentioning

confidence: 99%

“…However, a comprehensive exploration of its implementation in nanoscale wireless communication for data demodulation techniques remains a subject of further inquiry. Thus, this study employs the Floquet-Drude conductivity expression and the Floquet-Fermi golden rule [40,42] to investigate the correlation between the frequency of the dressing field and the longitudinal conductivity of a two-dimensional (2D) semiconductor under illumination. Subsequently, we conduct an in-depth examination of utilizing the Floquet formalism in information processing techniques focused on chip-scale wireless communication.…”

Section: Introductionmentioning

confidence: 99%

Floquet engineering-based frequency demodulation method for wireless THz short-range communications

Herath,

Nirmalathas,

Gunapala

et al. 2023

Phys. Scr.

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This study introduces a novel theoretical framework for detecting and decoding wireless communication signals in the nanoscale range operating at terahertz (THz) frequencies. Initially, we investigate the Floquet states in a dressed 2D semiconductor quantum well and derive an analytical expression to determine its longitudinal conductivity. The results indicate that the longitudinal conductivity of a dressed 2D semiconductor can be tailored to specific requirements by manipulating the frequency of the external dressing field. Furthermore, carefully selecting the intensity and polarization type of the external dressing field enables fine-tuning and optimization of the conductivity. To evaluate the effectiveness of each dressing field configuration, we present a Figure of Merit (FoM) assessment that determines the maximum possible change in conductivity within the considered frequency range. The proposed theory introduces a mechanism capable of identifying frequency-modulated communication signals in the THz range and performing frequency demodulation. We comprehensively analyze of the demodulator's transfer function in the receiver. Consequently, we establish that the transfer function exhibits linear behavior over a specific frequency range, rendering it suitable for frequency demodulation. Finally, we provide a numerical illustration of a frequency demodulation scenario. The breakthrough uncovered in this study opens up possibilities for the development of high-efficiency, lightweight, and cutting-edge chip-scale wireless communication devices, circuits, and components.

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Generalized model for the charge transport properties of dressed quantum Hall systems

Cited by 8 publications

References 93 publications

Excitonic Floquet states in quantum wire

Excitonic Floquet states in quantum wire

Investigating the impact of polarization on surface plasmon polariton characteristics in plasmonic waveguides under periodic driving fields

Floquet engineering-based frequency demodulation method for wireless THz short-range communications

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