15 citations · 89 across the 14 of their papers we have counts for
14 papers
Topological defect-mediated corner states and higher-order bulk topology in a two-dimensional crystalline insulator
Manideep Gone, Srijata Lahiri, Nabyendu Das
We report appearance of non-trivial zero energy corner modes in the form of topological defects (trimers) in a carefully designed 2D crystalline topological insulator. The proposed…
Optical phonon contribution to the thermal conductivity of a quantum paraelectric
Pankaj Bhalla, Nabyendu Das
Motivated by recent experimental findings, we study the contribution of a quantum critical optical phonon branch to the thermal conductivity of a paraelectric system. We consider t…
Observation of the possible chiral edge mode in Bi1-xSbx
M. Sasaki, A. Ohnishi, Nabyendu Das +2
After the classification of topological states of matter has been clarified for non-interacting electron systems, the theoretical connection between gapless boundary modes and nont…
Finite frequency Seebeck coefficient of metals: A memory function approach
Pankaj Bhalla, Pradeep Kumar, Nabyendu Das +2
We study the dynamical thermoelectric transport in metals subjected to the electron-impurity and the electron-phonon interactions using the memory function formalism. We introduce…
Theory of the Dynamical Thermal conductivity of Metals
Pankaj Bhalla, Pradeep Kumar, Nabyendu Das +2
The Mori's projection method, known as memory function method is an important theoretical formalism to study various transport coefficients. In the present work, we calculate the d…
Moment Expansion to the Memory Function for Generalized Drude Scattering rate
Pankaj Bhalla, Nabyendu Das, Navinder Singh +1
The memory function formalism is an important tool to evaluate the frequency dependent electronic conductivity. It is previously used within some approximations in the case of elec…
Memory Function Approach to Correlated Electron Transport: A Comprehensive Review
Nabyendu Das, Pankaj Bhalla, Navinder Singh +1
Memory function formalism or projection operator technique is an extremely useful method to study the transport and optical properties of various condensed matter systems. A recent…
Hot electron relaxation in metals within the Götze-Wölfle memory function formalism
Nabyendu Das, Navinder Singh, Navinder Singh Bathinda
We consider non-equilibrium relaxation of electrons due to their coupling with phonons in a simple metal. In our model electrons are living at a higher temperature than that of the…
Impurity induced resistivity upturns in underdoped cuprates
Nabyendu Das, Navinder Singh, Navinder Singh Bathinda
Impurity induced low temperature upturns in both the ab-plane and the c-axis dc-resistivities of cuprates in the pseudogap state have been observed in experiments. We provide an ex…
On the possibility of mixed phases in disordered quantum paraelectrics
Nabyendu Das
We present a theory of phase transition in quantum critical paraelectrics in presence of quenched random-Tc disorder using replica trick. The effects of disorder induced locally or…
Quantum critical behavior of a magnetic quantum paraelectric
Nabyendu Das
We discuss the interplay between anti-ferromagnetic order and polarization fluctuations in a magnetic quantum paraelectric. Using an action where anti-ferromagnetic order parameter…
Effects of Strain coupling and Marginal dimensionality in the nature of phase transition in Quantum paraelectrics
Nabyendu Das
Here a recently observed weak first order transition in doped SrTiO3 is argued to be a consequence of the coupling between strain and order parameter fluctuations. Starting with a…
First Order Phase Transition in Quantum Paraelectrics
Nabyendu Das, Suresh G. Mishra
We discuss the nature of pressure induced phase transitions in standard Quantum Paraelectrics near quantum critical point. From a microscopic theory we first show that near the cri…
Fluctuations and Criticality in Quantum Paraelectrics
Nabyendu Das, Suresh G. Mishra
The temperature dependence of static dielectric susceptibility of a system with strongly coupled fluctuating dipoles is calculated within a self consistent mean fluctuation field a…