Zobrazeno 1 - 10
of 118
pro vyhledávání: '"Bera, Soumya"'
The Chern-Hopf insulator is an unconventional three-dimensional topological insulator with a bulk gap and gapless boundary states without protection from global discrete symmetries. This study investigates its fate in the presence of disorder. We fin
Externí odkaz:
http://arxiv.org/abs/2408.03908
Publikováno v:
Phys. Rev. B 109, 224206 (2024)
How a closed system thermalizes, especially in the absence of global conservation laws but in the presence of disorder and interactions, is one of the central questions in non-equilibrium statistical mechanics. We explore this for a disordered, perio
Externí odkaz:
http://arxiv.org/abs/2403.08369
We explore the critical properties of a topological transition in a two-dimensional, amorphous lattice with randomly distributed points. The model intrinsically breaks the time-reversal symmetry without an external magnetic field, akin to a Chern ins
Externí odkaz:
http://arxiv.org/abs/2401.11855
Autor:
Bhat, Ruchira V, Bera, Soumya
Publikováno v:
Phys. Rev. B 109, 214313 (2024)
Using local quantum fidelity distances, we study the dynamical quantum phase transition in integrable and non-integrable one-dimensional Ising chains. Unlike the Loschmidt echo, the standard measure for distinguishing between two quantum states to de
Externí odkaz:
http://arxiv.org/abs/2308.00435
Publikováno v:
PRB 109, 035109 Jan 2024
We study the transport properties of a tight-binding model of non-interacting fermions with random hopping on the honeycomb lattice. At the particle-hole symmetric chemical potential, the absence of diagonal disorder (random onsite potentials) places
Externí odkaz:
http://arxiv.org/abs/2304.09674
Autor:
Dieplinger, Johannes, Bera, Soumya
We investigate the infinite temperature dynamics of the complex Sachdev-Ye-Kitaev model (SYK$_4$) complimented with a single particle hopping term (SYK$_2$), leading to the chaos-to-integrable crossover of the many-body eigenstates. Due to the presen
Externí odkaz:
http://arxiv.org/abs/2303.16019
Publikováno v:
Phys. Rev. B 108, 134204 (2023)
After a decade of many claims to the opposite, there now is a growing consensus that generic disordered quantum wires, e.g. the XXZ-Heisenberg chain, do not exhibit many-body localization (MBL) - at least not in a strict sense within a reasonable win
Externí odkaz:
http://arxiv.org/abs/2302.11384
The Sachdev-Ye-Kitaev (SYK) model is a rare example of a strongly-interacting system that is analytically tractable. Tractability arises because the model is largely structureless by design and therefore artificial: while the interaction is restricte
Externí odkaz:
http://arxiv.org/abs/2105.03208
Publikováno v:
Phys. Rev. B 103, 235167 (2021)
The spin quantum Hall (or class C) transition represents one of the few localization-delocalization transitions for which some of the critical exponents are known exactly. Not known, however, is the multifractal spectrum, $\tau_q$, which describes th
Externí odkaz:
http://arxiv.org/abs/2104.12079
Autor:
Bhat, Ruchira V, Bera, Soumya
Publikováno v:
J. Phys.: Condens. Matter 33, 164005 (2021)
One of the hallmarks of bulk topology is the existence of robust boundary localized states. For instance, a conventional $d$ dimensional topological system hosts $d{-}1$ dimensional surface modes, which are protected by non-spatial symmetries. Recent
Externí odkaz:
http://arxiv.org/abs/2011.01742