122 citations · 304 across the 16 of their papers we have counts for
19 papers
A Unified Understanding of Minimum Lattice Thermal Conductivity
Yi Xia, Dale Gaines, Jiangang He +4
We propose a first-principles model of minimum lattice thermal conductivity () based on a unified theoretical treatment of thermal transport in crystals and gl…
Identification of High-Dielectric Constant Compounds from Statistical Design
Abhijith Gopakumar, Koushik Pal, Chris Wolverton
The discovery of high-dielectric materials is crucial to increasing the efficiency of electronic devices and batteries. Here, we report three previously unexplored materials with v…
Scale-invariant Machine-learning Model Accelerates the Discovery of Quaternary Chalcogenides with Ultralow Lattice Thermal Conductivity
Koushik Pal, Cheol Woo Park, Yi Xia +2
Intrinsically low lattice thermal conductivity () is a desired requirement in many crystalline solids such as thermal barrier coatings and thermoelectrics. Here, we design an…
Exploring low lattice thermal conductivity materials using chemical bonding principles
Jiangang He, Yi Xia, Wenwen Lin +4
Semiconductors with very low lattice thermal conductivities are highly desired for applications relevant to thermal energy conversion and management, such as thermoelectrics and th…
Accelerated Discovery of a Large Family of Quaternary Chalcogenides with very Low Lattice Thermal Conductivity
Koushik Pal, Yi Xia, Jiahong Shen +4
The development of efficient thermal energy management devices such as thermoelectrics, barrier coatings, and thermal data-storage disks often relies on compounds that possess very…
Microscopic mechanism of unusual lattice thermal transport in TlInTe
Koushik Pal, Yi Xia, Chris Wolverton
We investigate the microscopic mechanism of ultralow lattice thermal conductivity () of TlInTe and its weak temperature dependence using a unified theory of lattice heat t…
Anomalous temperature dependence of optical and acoustic phonons in BiSe arising from stacking faults
Gyan Prakash, Koushik Pal, U. V. Waghmare +1
The class of layered 3D-topological insulators have shown intriguingly anomalous temperature dependence in their thermal expansion coefficients. It was proposed that stacking fault…
Pressure-induced Lifshitz transition in NbP: Raman, x-ray diffraction, electrical transport and density functional theory
Satyendra Nath Gupta, Anjali Singh, Koushik Pal +8
We report high pressure Raman, synchrotron x-ray diffraction and electrical transport studies on Weyl semimetals NbP and TaP along with first-principles density functional theoreti…
Raman anomalies as signatures of pressure induced electronic topological and structural transitions in black phosphorus: Experiments and Theory
Satyendra Nath Gupta, Anjali Singh, Koushik Pal +4
We report high pressure Raman experiments of Black phosphorus up to 24 GPa. The line widths of first order Raman modes A, B and A of the orthorhombic phase show…
Emergence of a weak topological insulator from the BiSe family and the observation of weak anti-localization
Kunjalata Majhi, Koushik Pal, Himanshu Lohani +7
The discovery of strong topological insulators led to enormous activity in condensed matter physics and the discovery of new types of topological materials. Bisumth based chalcogen…
Pressure-induced phase transition in BiSe at 3 GPa: electronic topological transition or not?
Achintya Bera, Koushik Pal, D V S Muthu +2
In recent years, a low pressure transition around P 3 GPa exhibited by the AB-type 3D topological insulators is attributed to an electronic topological transition (E…
Partial n-metric spaces and fixed point theorems
Samer Assaf, Koushik Pal
In this paper we combine the notions of partial metric spaces with negative distances, -metric spaces and n-metric spaces together into one structure called the partial n-metr…
The model theory of separably tame valued fields
Franz-Viktor Kuhlmann, Koushik Pal
A henselian valued field is called separably tame if its separable-algebraic closure is a tame extension, that is, the ramification field of the normal…
Partial metric spaces with negative distances and fixed point theorems
Samer Assaf, Koushik Pal
In this paper we consider partial metric spaces in the sense of O'Neill. We introduce the notions of strong partial metric spaces and Cauchy functions. We prove a fixed point theor…
Strain induced topological insulating state of -AsTe
Koushik Pal, Umesh V. Waghmare
Topological insulators are non-trivial quantum states of matter which exhibit a gap in the electronic structure of their bulk form, but a gapless metallic electronic spectrum at th…
Model companion of ordered theories with an automorphism
Michael C. Laskowski, Koushik Pal
Kikyo and Shelah showed that if is a theory with the Strict Order Property in some first-order language , then in the expanded language $\mathcal{L}_σ:= \mathcal{L…
Sharp Raman Anomalies and Broken Adiabaticity at a Pressure Induced Transition from Band to Topological Insulator in Sb2Se3
Achintya Bera, Koushik Pal, D. V. S. Muthu +4
The nontrivial electronic topology of a topological insulator is thus far known to display signatures in a robust metallic state at the surface. Here, we establish vibrational anom…
Quantifier Elimination For Tame Fields
Franz-Viktor Kuhlmann, Koushik Pal
In this paper, we give appropriate languages in which the theory of tame fields (of any characteristic) admits (relative) quantifier elimination.
Multiplicative Valued Difference Fields
Koushik Pal
The theory of valued difference fields depends on how the valuation interacts with the automorphism . Two special cases have already been worked out - the isomet…