54 citations · 183 across the 15 of their papers we have counts for
15 papers
Exceptional hypersurfaces of transfer matrices of finite-range lattice models and their consequences on quantum transport properties
Madhumita Saha, Manas Kulkarni, Bijay Kumar Agarwalla
We investigate the emergence and corresponding nature of exceptional points located on exceptional hyper-surfaces of non-hermitian transfer matrices for finite-range one-dimensiona…
Study of bounds on non-equilibrium fluctuations for asymmetrically driven quantum Otto engine
Sandipan Mohanta, Madhumita Saha, B. Prasanna Venkatesh +1
For a four-stroke asymmetrically driven quantum Otto engine with working medium modeled by a single qubit, we study the bounds on non-equilibrium fluctuations of work and heat. We…
Environment assisted superballistic scaling of conductance
Madhumita Saha, Bijay Kumar Agarwalla, Manas Kulkarni +1
We find that, in the presence of weak incoherent effects from surrounding environments, the zero temperature conductance of nearest neighbour tight-binding chains exhibits a counte…
Universal subdiffusive behavior at band edges from transfer matrix exceptional points
Madhumita Saha, Bijay Kumar Agarwalla, Manas Kulkarni +1
We discover a deep connection between parity-time (PT) symmetric optical systems and quantum transport in one-dimensional fermionic chains in a two-terminal open system setting. Th…
Quantum transport in quasi-periodic lattice systems in presence of Büttiker probes
Madhumita Saha, B. Prasanna Venkatesh, Bijay Kumar Agarwalla
Quasi-periodic lattice systems offer diverse transport properties. In this work, we investigate the environment induced effects on transport properties for quasi-periodic systems,…
Sub-diffusive phases in open clean long-range systems
Archak Purkayastha, Madhumita Saha, Bijay Kumar Agarwalla
We show that a one-dimensional ordered fermionic lattice system with power-law-decaying hopping, when connected to two baths at its two ends with different chemical potentials at z…
Read-out of Quasi-periodic Systems using Qubits
Madhumita Saha, Bijay Kumar Agarwalla, B. Prasanna Venkatesh
We develop a theoretical scheme to perform a read-out of the properties of a quasi-periodic system by coupling it to one or two qubits. We show that the decoherence dynamics of a s…
Anomalous transport through algebraically localized states in one-dimension
Madhumita Saha, Santanu K. Maiti, Archak Purkayastha
Localization in one-dimensional disordered or quasiperiodic non-interacting systems in presence of power-law hopping is very different from localization in short-ranged systems. Po…
More current with less particles due to power-law hopping
Madhumita Saha, Archak Purkayastha, Santanu K. Maiti
We reveal interesting universal transport behavior of ordered one-dimensional fermionic systems with power-law hopping. We restrict ourselves to the case where the power-law decay…
Particle current rectification in a quasi-periodic double-stranded ladder
Madhumita Saha, Santanu K. Maiti
We report transport properties and particle current rectification operation in a double-stranded tight-binding ladder network within non-equilibrium Green's function (NEGF) formali…
Anomalous thermoelectric properties of a Floquet topological insulator with spin momentum non-orthogonality
Madhumita Saha, Debashree Chowdhury
The spin momentum non-orthogonality in 3D topological insulators leads to modification of the spin texture and brings in an out-of-plane spin polarization component. Apart from spi…
High degree of current rectification at nanoscale level
Madhumita Saha, Santanu K. Maiti
We address an unexpectedly large rectification using a simple quantum wire with correlated site potentials. The external electric field, associated with voltage bias, leads to uneq…
Magnetic response of non-interacting and interacting electrons in a Möbius strip
Madhumita Saha, Santanu K. Maiti
We investigate characteristic features of both non-interacting and interacting electrons in a Möbius strip, the simplest possible one-sided topological system, in presence of an Ah…
Circulating current in 1D Hubbard rings with long-range hopping: Comparison between exact diagonalization method and mean-field approach
Madhumita Saha, Santanu K. Maiti
The interplay between Hubbard interaction, long-range hopping and disorder on persistent current in a mesoscopic one-dimensional conducting ring threaded by a magnetic flux is…
Metal-insulator transition in an one-dimensional half-filled interacting mesoscopic ring with spinless fermions: Exact results
Madhumita Saha, Santanu K. Maiti
We calculate persistent current of one-dimensional rings of fermions neglecting the spin degrees of freedom considering only nearest-neighbor Coulomb interactions with different el…