Floquet generation of a second-order topological superconductor

Ghosh, Arnob Kumar; Nag, Tanay; Saha, Arijit

doi:10.1103/physrevb.103.045424

Cited by 60 publications

(30 citation statements)

References 96 publications

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“…Compound-specific results obtained in the context of MCE in the density functional approach are of high value but it can be difficult to derive any qualitative and unbiased conclusions from these investigations 3, [55][56][57] . However, the model-based approach used in the paper, which ignores any specific features of the density of states, captures the fundamentals about metals and allows for a completely general description of the phase separation in a first order magnetic phase transition and how it impacts MCE.…”

Section: Discussionmentioning

confidence: 99%

Emerging mechanisms of magnetocaloric effect in phase-separated metals

Ivchenko,

Igoshev

2021

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We present a study of the magnetocaloric effect in metallic systems exhibiting first order magnetic transitions and focus on consequences of magnetic phase separation. We account for ferrimagnetic, ferromagnetic and Neel antiferromagnetic order. Based on the archetypal Hubbard model being treated within the mean-field approximation, we provide and explore its implications on the fieldinduced entropy change in metallic system with phase separation. Chosen framework allows us to properly analyze phase volumes' dependence on parameters of phase-separated (PS) system.Moreover, an account for phase separation boundaries as functions of magnetic field provides a natural splitting of the PS region, where each subregion corresponds to a different temperature dependence of entropy change: moving from one subregion to the other produces a kink, followed by a strong linear growth of entropy change. We encounter a second order magnetic transition from paramagnetic to antiferromagnetic phase in PS region that occurs for particular parameter values. Despite the fact that both phases have zero total magnetization, the transition has a strong impact on entropy change.

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Section: Discussionmentioning

confidence: 99%

Emerging mechanisms of magnetocaloric effect in phase-separated metals

Ivchenko,

Igoshev

2021

Preprint

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“…Many times, the Floquet systems show new exotic topological phases that may not be realized by any static means. For example, new Floquet topological phases in graphene illuminated by circularly polarized laser field [42,43], higher-order topological phases in superconductor [44,45], switching of the native topology of the SSH model [46], etc.…”

Section: Introductionmentioning

confidence: 99%

Floquet topological phases with high Chern numbers in a periodically driven extended Su-Schrieffer-Heeger model

Agrawal,

Bandyopadhyay

2022

Preprint

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The high Chern number phases with the Chern number |C| > 1 are observed in this study of a periodically driven extended Su-Schrieffer-Heeger (E-SSH) model with a cyclic parameter. Besides the standard intra-dimer and the nearest-neighbor (NN) inter-dimer hopping of the SSH model, an additional next-nearestneighbor (NNN) hopping is considered in the E-SSH model. The cyclic parameter, which plays the role of a synthetic dimension, is invoked as a modulation of the hopping strengths. A rigorous analysis of different phase diagrams has shown multiple Floquet topological phase transitions among the high Chern number phases. These phase transitions can be controlled by the strength and frequency of the periodic driving. Instead of applying perturbation theory, the whole analysis is done by Floquet replica technique. This gives a freedom to study high as well as low-frequency effects on the system by considering less or more number of photon sectors. This system can be experimentally realized through a pulse sequence scheme in the optical lattice setup.

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“…Higher-order topological insulators (HOTIs) are an intriguing group of topological phases [25,26] that feature gapped first-order boundary and gapless higher-order boundary. Soon after the discovery of HOTIs, several groups have investigated the possibility of realizing Floquet HO-TIs (FHOTIs) [27][28][29][30][31][32][33][34][35][36][37][38][39][40], such as the use of driving schemes whose instantaneous Hamiltonians possess the symmetries of static HOTIs [28][29][30][32][33][34], as well as the use of peculiar space-time symmetries that are unique to periodically driven systems [31,35,36]. To date, it remains unclear what is the ideal experimental platform for realizing a FHOTI and studying its properties.…”

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confidence: 99%

“…Here, we present a periodically driven bipartite square lattice model hosting FHOTI phases that should be easily experimentally accessible. Unlike previous FHOTI proposals that have required either negative hopping/coupling [33,34], or spin-orbital or superconducting interactions [28][29][30][31][32][35][36][37][38][39][40], our model involves a simple two-band single-particle Hamiltonian with only periodic time modulation in the onsite potential differences and nearest-neighbor couplings, and with all couplings strictly non-negative throughout the driving protocol. These features allow the model to be implemented in experimental platforms such as optical waveguide arrays [18][19][20][21][22][23][24] and coupled optical resonator lattices [12][13][14][15][16][17] (i.e., minor variations of the experimental setups previously used to realize Floquet topological insulators [19][20][21][22][23]).…”

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confidence: 99%