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pro vyhledávání: '"Das, Sanjib Kumar"'
Autor:
Das, Sanjib Kumar, Roy, Bitan
From lattice-regularized models, devoid of any non-Hermitian (NH) skin effects, here we compute the electrical ($\sigma_{xy}$), thermal ($\kappa_{xy}$), and spin ($\sigma^{sp}_{xy}$) Hall, and the electrical ($G_{xx}$) and thermal ($G^{th}_{xx}$) lon
Externí odkaz:
http://arxiv.org/abs/2408.00763
Autor:
Das, Sanjib Kumar, Roy, Bitan
Altermagnets are crystallographic rotational symmetry breaking spin-ordered states, possessing a net zero magnetization despite manifesting Kramers non-degenerate bands. Here, we show that momentum-independent local spin nematic orders in monolayer,
Externí odkaz:
http://arxiv.org/abs/2403.14620
We propose a general principle of constructing non-Hermitian (NH) operators for insulating and gapless topological phases in any dimension ($d$) that over an extended NH parameter regime feature real eigenvalues and zero-energy topological boundary m
Externí odkaz:
http://arxiv.org/abs/2309.12310
Autor:
Das, Sanjib Kumar, Roy, Bitan
Publikováno v:
Phys. Rev. B 109, 195403 (2024)
Nontrivial bulk topological invariants of quantum materials can leave their signatures on charge, thermal and spin transports. In two dimensions, their imprints can be experimentally measured from well-developed multiterminal Hall bar arrangements. H
Externí odkaz:
http://arxiv.org/abs/2308.16908
Autor:
Das, Sanjib Kumar, Roy, Bitan
Traditional topological materials belong to different Altland-Zirnbauer symmetry classes (AZSCs) depending on their non-spatial symmetries. Here we introduce the notion of hybrid symmetry class topological insulators (HSCTIs): A fusion of two differe
Externí odkaz:
http://arxiv.org/abs/2305.16313
Publikováno v:
Phys. Rev. B 108, 155426 (2023)
Immersed in external magnetic fields ($B$), buckled graphene constitutes an ideal tabletop setup, manifesting a confluence of time-reversal symmetry (${\mathcal T}$) breaking Abelian ($B$) and ${\mathcal T}$-preserving strain-induced internal axial (
Externí odkaz:
http://arxiv.org/abs/2212.00788
Publikováno v:
Phys. Rev. B 108, L041301 (2023)
Topological classification of quantum solids often (if not always) groups all trivial atomic or normal insulators (NIs) into the same featureless family. As we argue here, this is not necessarily the case always. In particular, when the global phase
Externí odkaz:
http://arxiv.org/abs/2211.09804
Autor:
Das, Sanjib Kumar, Roy, Bitan
Publikováno v:
Phys. Rev. B 108, 144304 (2023)
Bulk dislocation lattice defects are instrumental in identifying translationally active topological insulators (TATIs), featuring band inversion at a finite momentum (${\bf K}_{\rm inv}$). As such, TATIs host robust gapless modes around the dislocati
Externí odkaz:
http://arxiv.org/abs/2210.15661
Publikováno v:
Phys. Rev. B 107, 245141 (2023)
Time reversal and inversion symmetric materials fail to yield linear and nonlinear responses since they possess net zero Berry curvature. However, higher-order Hall response can be generated in these systems upon constraining the crystalline symmetri
Externí odkaz:
http://arxiv.org/abs/2209.06867
Autor:
Das, Sanjib Kumar
Metals and semiconductors are widely used for making technological devices as they carry electricity. Discovery of topological insulator (TI) has enriched the list of such materials. TIs are different than conventional insulators in the sense that, e
Externí odkaz:
https://tud.qucosa.de/id/qucosa%3A77835
https://tud.qucosa.de/api/qucosa%3A77835/attachment/ATT-0/
https://tud.qucosa.de/api/qucosa%3A77835/attachment/ATT-0/