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Generation of highe...
Generation of higher-order topological insulators using periodic driving
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- Ghosh, Arnob Kumar (författare)
- Uppsala universitet,Materialteori,Inst Phys, Sachivalaya Marg, Bhubaneswar 751005, India; Homi Bhabha Natl Inst, Training Sch Complex, Mumbai 400094, India
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- Nag, Tanay (författare)
- Uppsala universitet,Materialteori,BITS Pilani, Dept Phys, Hyderabad Campus, Hyderabad 500078, Telangana, India
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- Saha, Arijit (författare)
- Inst Phys, Sachivalaya Marg, Bhubaneswar 751005, India; Homi Bhabha Natl Inst, Training Sch Complex, Mumbai 400094, India
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(creator_code:org_t)
- Institute of Physics Publishing (IOPP), 2024
- 2024
- Engelska.
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Ingår i: Journal of Physics. - : Institute of Physics Publishing (IOPP). - 0953-8984 .- 1361-648X. ; 36:9
- Relaterad länk:
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https://doi.org/10.4...
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visa fler...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Topological insulators (TIs) are a new class of materials that resemble ordinary band insulators in terms of a bulk band gap but exhibit protected metallic states on their boundaries. In this modern direction, higher-order TIs (HOTIs) are a new class of TIs in dimensions d > 1. These HOTIs possess -dimensional boundaries that, unlike those of conventional TIs, do not conduct via gapless states but are themselves TIs. Precisely, an nth order d-dimensional higher-order TI is characterized by the presence of boundary modes that reside on its -dimensional boundary. For instance, a three-dimensional second (third) order TI hosts gapless (localized) modes on the hinges (corners), characterized by . Similarly, a second-order TI (SOTI) in two dimensions only has localized corner states (). These higher-order phases are protected by various crystalline as well as discrete symmetries. The non-equilibrium tunability of the topological phase has been a major academic challenge where periodic Floquet drive provides us golden opportunity to overcome that barrier. Here, we discuss different periodic driving protocols to generate Floquet HOTIs while starting from a non-topological or first-order topological phase. Furthermore, we emphasize that one can generate the dynamical anomalous π-modes along with the concomitant 0-modes. The former can be realized only in a dynamical setup. We exemplify the Floquet higher-order topological modes in two and three dimensions in a systematic way. Especially, in two dimensions, we demonstrate a Floquet SOTI (FSOTI) hosting 0- and π corner modes. Whereas a three-dimensional FSOTI and Floquet third-order TI manifest one- and zero-dimensional hinge and corner modes, respectively.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- ID
- generation
- higher-order
- topological
- insulators
- periodic
- Floquet systems
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- ref (ämneskategori)
- for (ämneskategori)
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