19 citations · 150 across the 23 of their papers we have counts for
24 papers
RG Limit Cycles in BKT Flows Periodic Real-Time Dynamics in the Current-Current Perturbed WZW Model
Parameshwar R. Pasnoori
We establish an exact correspondence between renormalization-group (RG) evolution and real-time quantum dynamics in the anisotropic current-current perturbed Wess-Zumino-…
Boundary Quantum Knizhnik-Zamolodchikov Equations and Integrability of Quantum Field Theories with Time-Dependent Bulk and Boundary Coupling Strengths
Parameshwar R. Pasnoori
The generalized Bethe ansatz framework formulated in [P. R. Pasnoori, Phys. Rev. B 112, L060409 (2025)] provides a unified framework to find exact solutions to quantum many-body sy…
Beyond Integrability Preserving Renormalization-Group Protocol in Non-Hermitian Hamiltonians with Time-Dependent Interaction Strengths
Parameshwar R. Pasnoori
It is well established that in time-dependent quantum systems, integrability preserving time-dependent interaction strengths are identical to the renormalization group (RG) traject…
Time-Dependent Dynamical Dimensional Transmutation in the Gross-Neveu Model with Time-Dependent Interaction Strength
Parameshwar R. Pasnoori
In this work we study driven Gross-Neveu (GN) model whose time-dependent interaction strength is constrained by quantum integrability within the recently developed generali…
Quantum Integrability of Hamiltonians with Time-Dependent Interaction Strengths and the Renormalization Group Flow
Parameshwar R. Pasnoori
In this paper we consider quantum Hamiltonians with time-dependent interaction strengths, and following the recently formulated generalized Bethe ansatz framework [P. R. Pasnoori,…
Quantum Knizhnik-Zamolodchikov Equations and Integrability of Quantum Field Theories with Time-dependent Interaction Strength
Parameshwar R. Pasnoori
In this paper we consider the problem of solving quantum field theories with time dependent interaction strengths. We show that the recently formulated framework [P. R. Pasnoori, P…
Exact many-body wavefunction of the Kondo model with time-dependent interaction strength
Parameshwar R. Pasnoori, Emil. A. Yuzbashyan
Quantum integrability has been applied to a large variety of low dimensional Hamiltonians in Quantum Field Theory, Condensed Matter Physics, and Statistical Mechanics to obtain exa…
Complete Boundary Phase Diagram of the Spin- XXZ Chain with Boundary Fields in the Anti-Ferromagnetic Gapped Regime
Parameshwar R. Pasnoori, Yicheng Tang, Junhyun Lee +3
We consider the spin XXZ chain with diagonal boundary fields and solve it exactly using Bethe ansatz in the gapped anti-ferromagnetic regime and obtain the complete p…
Interplay between Symmetry Breaking and Interactions in a Symmetry Protected Topological Phase
Parameshwar R. Pasnoori, Patrick Azaria
We solve the one dimensional massive Thirring model or equivalently the sine-Gordon model in the repulsive regime with general Dirichlet boundary conditions, which are characterize…
Emergent boundary supersymmetry in a one dimensional superconductor
Parameshwar R. Pasnoori, Patrick Azaria, Colin Rylands +1
The interplay between bulk properties and boundary conditions in one-dimensional quantum systems, gives rise to many intriguing phenomena. These include the emergence of zero energ…
Integrability of the Kondo model with time dependent interaction strength
Parameshwar R. Pasnoori
In this letter we consider the time dependent Kondo model where a magnetic impurity interacts with the electrons through a time dependent interaction strength . We develop a…
Duality symmetry, zero energy modes and boundary spectrum of the sine-Gordon/massive Thirring model
Parameshwar R. Pasnoori, Ari Mizel, Patrick Azaria
We solve the one-dimensional massive Thirring model, which is equivalent to the one-dimensional sine-Gordon model, with two types of Dirchlet boundary conditions: open boundary con…
Realizing a Symmetry Protected Topological Phase in a Superconducting Circuit
Parameshwar R. Pasnoori, Patrick Azaria, Ari Mizel
We propose a superconducting quantum circuit whose low-energy degrees of freedom are described by the sine-Gordon (SG) quantum field theory. For suitably chosen parameters, the cir…
Edge modes and boundary impurities in the anisotropic Heisenberg spin chain
Pradip Kattel, Parameshwar R. Pasnoori, J. H. Pixley +1
We present a comprehensive analysis of boundary phenomena in a spin- anisotropic Heisenberg chain (XXZ-) in the gapped antiferromagnetic phase, with a par…
A spin chain with non-Hermitian symmetric boundary couplings: exact solution, dissipative Kondo effect, and phase transitions on the edge
Pradip Kattel, Parameshwar R. Pasnoori, J. H. Pixley +1
We construct an exactly solvable symmetric non-Hermitian model where a spin isotropic quantum Heisenberg spin chain is coupled to two spin$-\frac{1}{2}…
Dissipation driven phase transition in the non-Hermitian Kondo model
Pradip Kattel, Abay Zhakenov, Parameshwar R. Pasnoori +2
Non-Hermitian Hamiltonians capture several aspects of open quantum systems, such as dissipation of energy and non-unitary evolution. An example is an optical lattice where the inel…
Spin fractionalization and zero modes in the spin- XXZ chain with boundary fields
Parameshwar R. Pasnoori, Yicheng Tang, Junhyun Lee +3
In this work we argue that the antiferromagnetic spin XXZ chain in the gapped phase with boundary magnetic fields hosts fractional spin at its edges. Us…
Kondo effect in the isotropic Heisenberg spin chain
Pradip Kattel, Parameshwar R. Pasnoori, J. H. Pixley +2
We investigate the boundary effects that arise when spin- impurities interact with the edges of the antiferromagnetic spin- Heisenberg chain through spin…
Exact solution of a non-Hermitian -symmetric Heisenberg spin chain
Pradip Kattel, Parameshwar R. Pasnoori, Natan Andrei
We construct the exact solution of a non-Hermitian -symmetric isotropic Heisenberg spin chain with integrable boundary fields. We find that the system exhibits two ty…
Boundary Quantum Phase Transitions in the Spin Heisenberg Chain with Boundary Magnetic Fields
Parameshwar R. Pasnoori, Junhyun Lee, J. H. Pixley +2
We consider the spin Heisenberg chain with boundary magnetic fields and analyze it using a combination of Bethe ansatz and density matrix renormalization group (DMRG)…
Rise and fall of Yu-Shiba-Rusinov bound-states in charge conserving -wave one-dimensional superconductors
Parameshwar R. Pasnoori, Natan Andrei, Colin Rylands +1
We re-examine the problem of a magnetic impurity coupled to a superconductor focusing on the role of quantum fluctuations. We study in detail, a system that consists of a one-dimen…
Boundary-Induced Topological and Mid-Gap States in Charge Conserving One-Dimensional Superconductors
Parameshwar R. Pasnoori, Natan Andrei, Patrick Azaria
We investigate one-dimensional charge conserving, spin-singlet (SSS) and spin-triplet (STS) superconductors in the presence of boundary fields. In systems with Open Boundary Condit…
Edge Modes in One Dimensional Topological Charge Conserving Spin-Triplet Superconductors: Exact Results from Bethe Ansatz
Parameshwar R. Pasnoori, Natan Andrei, Patrick Azaria
Charge conserving spin singlet and spin triplet superconductors in one dimension are described by the symmetric Thirring Hamiltonian. We solve the model with open boundary c…
Kondo impurity at the edge of a superconducting wire
Parameshwar R. Pasnoori, Colin Rylands, Natan Andrei
Quantum impurity models are prevalent throughout many body physics, providing some prime examples of strongly correlated systems. Aside from being of great interest in themselves t…