About

Saurabh Basu is an Associate Professor in the Department of Industrial and Manufacturing Engineering at Penn State University. His research areas include manufacturing, with a focus on advanced manufacturing, manufacturing processing, and additive manufacturing. His work involves exploring innovative manufacturing techniques and processes, contributing to the development of new methods and technologies in the field of manufacturing engineering.

Research topics

• Composite material
• Materials science
• Artificial Intelligence
• Metallurgy
• Physics
• Computer Science
• Chemistry
• Engineering
• Mechanics
• Medicine
• Structural engineering
• Chemical engineering
• Veterinary medicine
• Thermodynamics
• Statistical physics
• Internal medicine
• Biological system
• Biology
• Virology

Selected publications

• Controlling Dissipative Topology Through Floquet Driving: From Transient Diagnostics to Boundary States Isolation

  ArXiv.org · 2025-11-28

  preprintOpen accessSenior author

  Engineering dissipative dynamics in open quantum systems is under active focus, especially in topological settings where resilient edge modes are expected to exhibit decay rates distinct from the bulk. In this letter, we propose an efficient dynamical scheme to discern such long-lived excitations. Employing a Floquet-Lindblad framework, we explore how periodic driving reshapes the key features of a paradigmatic topological model, namely a Creutz ladder. Our results bear testimony to a drive-induced unipolar-bipolar transition in the Liouvillian skin effect, which gets dynamically manifested as a chiral-helical damping crossover. Such a transition effectively rescales the bulk localization length, giving rise to a polarization drift that we identify as a new invariant for efficient diagnosis of the nontrivial phases. As the transition becomes more gradual via tuning drive-rescaled parameters, we uncover signatures of a scale-free localization where skin and extended modes co-exist with distinct decay rates. The emergent hierarchy of the decay rates yields two disparate timescales: a chiral wavefront that rapidly empties the bulk followed by a long-lived regime dominated by robust edge modes. Overall, our results provide convincing evidence that periodic driving serves as a powerful handle to manipulate dissipative topological phases and dynamically isolate the boundary modes.

  PublisherOA PDFDOI

• Floquet-engineered diode performance of a topological Josephson junction composed of two Kitaev chains coupled via a quantum dot

  Physical review. B./Physical review. B · 2025-08-12 · 3 citations

  articleOpen accessSenior author

  We study nonreciprocal signatures of Josephson current in a quantum dot (QD)-based Josephson junction that comprises two periodically driven Kitaev chains (KCs) coupled with an intervening QD. The simultaneous breaking of the inversion symmetry and the time-reversal symmetry, indispensable for the Josephson diode effect (JDE), is achieved solely via the two Floquet drives that differ by a finite phase, which eventually results in a nonreciprocal current and hence yields a finite JDE. It may be noted that the Floquet Majorana modes generated at both the far ends of the KCs (away from the QD) and adjacent to the QD junctions mediate the Josephson current owing to a finite superconducting (SC) phase difference in the two KCs. We calculate the time-averaged Josephson current and inspect the tunability of the current-phase relation to ascertain the diode characteristics. The asymmetric Floquet drive also manifests an anomalous Josephson current signature in our KC-QD-KC Josephson junction. Furthermore, additional control over the QD energy level can be achieved via an external gate voltage that renders flexibility for the diode to act as an SC switching device. Tuning different system parameters, such as the chemical potential of the KCs, Floquet frequency, the relative phase mismatch of the drives, and the gate voltage, our model shows a maximum rectification $\ensuremath{\sim}70%$. Summarizing, in our study, we provide an alternative scenario, replacing the traditional usage of an external magnetic field and spin-orbit coupling effects in a Josephson diode via asymmetrically driven Kitaev leads that entail Majorana-mediated transport.

  PublisherOA PDFDOI

• Emergent topological phases and coexistence of gapless and spectral-localized Floquet quantum spin Hall states via electron-phonon interaction

  Physical review. B./Physical review. B · 2025-08-19 · 1 citations

  articleOpen accessSenior author

  In this work, a thorough exploration has been carried out to unravel the role of electron-phonon interaction (EPI) in a Bernevig-Hughes-Zhang quantum spin Hall (QSH) insulator subjected to a time-periodic step drive. It is observed that upon inclusion of the EPI, the system demonstrates emergent Floquet QSH phases and several topological phase transitions thereof, mediated solely by the interaction strength. Such transitions are indicated by the discontinuities in the projected spin Chern number. Furthermore, to employ a topological invariant that can characterize the system in an energy-resolved manner, a spectral localizer ($\mathcal{SL}$) is introduced, which distinctly ascertains the nature of the (zero or $\ensuremath{\pi}$) edge modes obtained within the corresponding topological gap. Quite intriguingly, we also observe the emergence of phases hosting a topological zero ($\ensuremath{\pi}$) energy gap while its $\ensuremath{\pi}$ (zero) energy sector is gapless. With the Chern number being found to be deficient in characterizing such coexistent phases, a real-space Chern marker (following the $\mathcal{SL}$ prescription) computed by us further provides support to such a gapless Floquet topological scenario. Our results may be realized in optical setups that may underscore the importance of EPI-induced Floquet features.

  PublisherOA PDFDOI

• A novel thermal analysis of the abrasive flow machining (AFM) process

  The International Journal of Advanced Manufacturing Technology · 2025-02-25 · 4 citations

  article
  PublisherDOI

• Topological characterization of a non-Hermitian ladder via Floquet non-Bloch theory

  Physical review. B./Physical review. B · 2025-03-24 · 6 citations

  articleSenior author

  In this paper, we study a non-Hermitian (NH) ladder subjected to a variety of driving protocols. The driven system looses chiral symmetry (CS), whose presence is indispensable for its topological characterization. Further, the bulk boundary correspondence (BBC) gets adversely affected due to the presence of the non-Hermitian skin effect (NHSE). Here, we present a formalism that retrieves the lost CS and subsequently restores the BBC via the construction of a generalized Brillouin zone (GBZ). Specifically, we employ delta and step drives to compare and contrast between them with regard to their impact on NHSE. Further, a widely studied harmonic drive is invoked in this context, not only for the sake of completeness, but its distinct computational framework offers valuable insights on the properties of out-of-equilibrium systems. While the delta and harmonic drives exhibit unidirectional skin effect in the system, the step drive may show a bidirectional skin effect. Also, there are specific points in the parameter space that are devoid of skin effect. These act as critical points that distinguish the skin modes to be localized at one boundary or the other. Moreover, for the computation of the non-Bloch invariants, we employ GBZ via a pair of symmetric time frames corresponding to the delta and step drives, while a high-frequency expansion was carried out to deal with the harmonic drive. Finally, we present phase boundary diagrams that demarcate distinct NH phases obtained via tracking the trajectories of the exceptional points. These diagrams demonstrate a coexistence of the zero and $\ensuremath{\pi}$ energy modes in the strong NH limit and thus may be relevant for studies of Floquet time crystals.

  PublisherDOI

• Acoustic performances of triply periodic minimal surfaces fabricated by additive manufacturing: Effects of cell geometry, aspect ratio, and wall thickness

  Additive manufacturing · 2025-06-01 · 3 citations

  articleOpen access

  This work evaluates the acoustic absorption of additively manufactured Triply Periodic Minimal Surfaces (TPMS), focusing on Gyroid and Diamond geometries with varying aspect ratios (AR) and wall thicknesses (WT). Samples were characterized using two and four-microphone impedance tubes, and a test bench for measuring air flow resistivity. Results show that Diamond structures with AR = 0.5 and WT = 0.5 mm achieved almost complete sound absorption (α = 99) at 1185 Hz with a 30 mm sample thickness, outperforming Gyroid geometries. Lower AR values enhanced sound absorption at mid-frequency by increasing tortuosity and decreasing flow resistivity. The non-acoustic parameters retrieved from measurements were used for an inverse characterization based on the Johnson Champoux Allard model. The fitting proved to be very good. These findings provide practical design criteria for optimizing TPMS-based acoustic absorbers in industrial noise control.

  PublisherDOI

• Floquet Non-Bloch Formalism for a Non-Hermitian Ladder: From Theoretical Framework to Topolectrical Circuits

  arXiv (Cornell University) · 2025-07-31

  preprintOpen accessSenior author

  Periodically driven systems intertwined with non-Hermiticity opens a rich arena for topological phases that transcend conventional Hermitian limits. The physical significance of these phases hinges on obtaining the topological invariants that restore the bulk-boundary correspondence, a task well explored for static non-Hermitian (NH) systems, while it remains elusive for the driven scenario. Here, we address this problem by constructing a generalized Floquet non-Bloch framework that analytically captures the spectral and topological properties of time-periodic NH systems. Employing a high-frequency Magnus expansion, we analytically derive an effective Floquet Hamiltonian and formulate the generalized Brillouin zone for a periodically driven quasi-one-dimensional system, namely, the Creutz ladder with a staggered complex potential. Our study demonstrates that the skin effect remains robust (despite the absence of non-reciprocal hopping) across a broad range of driving parameters, and is notably amplified in the low-frequency regime due to emergent longer-range couplings. We further employ a symmetric time frame approach that generates chiral-partner Hamiltonians, whose invariants, when appropriately combined, account for the full edge-state structure. To substantiate the theoretical framework, we propose a topolectrical circuit (TEC) that serves as a viable experimental setting. Apart from capturing the skin modes, the proposed TEC design faithfully reproduces the presence of distinct Floquet edge states, as revealed through the voltage and impedance profiles, respectively. Thus, our work not only offers a theoretical framework for exploring NH-driven systems, but also provides an experimentally feasible TEC architecture for realizing these phenomena stated above in a laboratory.

  PublisherOA PDFDOI

• Competing topological phases in a non-Hermitian time-reversal symmetry broken Bernevig-Hughes-Zhang model

  Physical review. B./Physical review. B · 2024-09-17 · 7 citations

  articleSenior author

  The Bernevig-Hughes-Zhang (BHZ) model, which serves as a cornerstone in the study of the quantum spin Hall insulators, showcases robust spin-filtered helical edge states in a nanoribbon geometry. In the presence of an in-plane magnetic field, these (first-order) helical states gap out to be replaced by second-order corner states under suitable open boundary conditions. Here, we show that the inclusion of a spin-dependent non-Hermitian balanced gain/loss potential induces competition between these first- and second-order topological phases. Surprisingly, the previously dormant first-order helical edge states resurface as the non-Hermitian effect intensifies, effectively neutralizing the role played by the magnetic field. By employing the projected spin spectra and the spin Chern number, we conclusively explain the resurgence of the first-order topological properties in the time-reversal symmetry-broken BHZ model in the presence of nonhermiticity. Finally, the biorthogonal spin-resolved Berry phase, exhibiting a nontrivial winding, definitively establishes the topological nature of these revived edge states, emphasizing the dominance of nonhermiticity over the magnetic field.

  PublisherDOI

• Quantum Hall Effect

  Cambridge University Press eBooks · 2024-08-31 · 1 citations

  book1st authorCorresponding

  This book deals with the discovery and explanation of the quantum Hall effect and its fundamental principles. It is meant for undergraduate and graduate students of physics, engineering, and applied sciences studying condensed matter physics. Doctoral students and researchers of this subject will also find it equally useful. It begins with a historical overview of this effect wherein the experiment and the physical systems are described. It progresses to cover discrete symmetries like inversion symmetry, time reversal symmetry, particle-hole symmetry, and chiral symmetry. It also examines how the Hamiltonian transforms under such symmetry operations. Two 1D models, namely the Su-Schrieffer-Heeger (SSH) model and a Kitaev chain with superconducting correlations, are discussed too. Then, the quantum Hall effect in graphene is explained. Further, the spin Hall effect is studied which may have prospects of using graphene as spintronic devices. The book ends with a brief review on fractional quantum Hall effect.

  PublisherDOI

• Depth-Resolved Characterization of Centrifugal Disk Finishing of Additively Manufactured Inconel 718

  arXiv (Cornell University) · 2024-04-29

  preprintOpen access

  Surface characteristics are a major contributor to the in-service performance, particularly fatigue life, of additively manufactured (AM) components. Centrifugal disk finishing (CDF) is one of many rigid media, abrasive machining processes employed to smooth the surfaces and edges of AM components. Within the general family of abrasive machining processes currently applied to AM, CDF is moderate in terms of material removal rate and the inertial forces exerted. How CDF alters the underlying microstructure of the processed surface is currently unknown. Here we employ white light profilometry and high-energy X-ray diffraction to characterize surface finish, crystallographic texture, and anisotropic distributions of residual microscale strain as a function of depth in CDF-finished Inconel 718 manufactured with laser powder bed fusion. Surfaces are finished using both unimodal and bimodal finishing media size distributions. We find that CDF will remove surface crystallographic textures (here a {111} fiber texture) from AM components, but generally not alter the bulk texture (here a cube texture). CDF is also found to impart significant amounts of residual microscale strain into the first 100 $μ$m from the sample surface as evidenced by an approximately 50% increase in diffraction peak widths at 20 $μ$m from the surface in comparison to 120 $μ$m.

  PublisherOA PDFDOI

Recent grants

• Collaborative Research: Hybrid-Compatible Deformation Processing of Performance Critical Components

  NSF · $332k · 2018–2023

Frequent coauthors

• M. Ravi Shankar

  National Geophysical Research Institute

  22 shared

• Christopher Saldaña

  Georgia Institute of Technology

  15 shared

• Mustafa Rifat

  Pennsylvania State University

  13 shared

• Pankaj Kumar Dalela

  12 shared

• Zhiyu Wang

  10 shared

• Sepideh Abolghasem

  9 shared

• Edward C. DeMeter

  Pennsylvania State University

  9 shared

• Shashank Shekhar

  Indian Institute of Technology Kanpur

  8 shared

Labs

• Additive Manufacturing and Reverse Engineering LabPI

Education

• Ph. D. , Department of Industrial Engineering

  University of Pittsburgh

  2014