18 citations · 74 across the 22 of their papers we have counts for
22 papers
Breakdown of Monotonic Impurity Entropy Flow in -Symmetric Multichannel Kondo Systems
Pradip Kattel, Abay Zhakenov, Natan Andrei
We study a -symmetric non-Hermitian multichannel Kondo model consisting of a pair of spin- impurities coupled to conduction-electron channels through com…
Boundary phases and thermodynamics of the Kondo spin- chain: from overscreened Kondo to boundary-bound states
Abay Zhakenov, Pradip Kattel, Andreas Gleis +1
We study a spin- impurity coupled to the boundary of a strongly correlated spin- Takhtajan--Babujian chain, an integrable model whose low-energy physics is described by…
Exact Dynamics of Topological Order Across a CDW--SPT Transition
Pradip Kattel, Yicheng Tang, Natan Andrei
We investigate the nonequilibrium dynamics of a one-dimensional interacting system across a transition from a charge-density-wave (CDW) phase to a symmetry-protected topological (S…
Isospectrality and Operator Complexity
Pradip Kattel, Yicheng Tang, Natan Andrei
We study a pair of exactly solvable, isospectral fermion chains, one strongly interacting and one quadratic, that nevertheless display remarkably different phase structures and ope…
Monotonic and non-Nonmonotonic Impurity Entropy flows in a -Symmetric Kondo Model
Pradip Kattel, Abay Zhakenov, Natan Andrei
Quantum impurity models provide a paradigmatic setting for studying Kondo screening, boundary criticality, and impurity entropy. While these phenomena are well understood in unitar…
Multichannel Kondo Effect in Superconducting Leads
Pradip Kattel, Abay Zhakenov, Natan Andrei
The traditional multichannel Kondo effect takes place when several gapless metallic electronic channels interact with a localized spin- impurity, with the number of channels …
Thermodynamics in a split Hilbert space: Quantum impurity at the edge of the Heisenberg chain
Abay Zhakenov, Pradip Kattel, Natan Andrei
We study the isotropic spin- Heisenberg chain with a single edge-coupled impurity of arbitrary exchange strength . The model exhibits four impurity phases. For anti…
Thermodynamics in a split Hilbert space: Quantum impurity at the edge of a one-dimensional superconductor
Pradip Kattel, Abay Zhakenov, Natan Andrei
We present a thermodynamic description of a single magnetic impurity at the edge of a superconducting wire. The impurity exhibits four phases $\unicode{x2014}$ Kondo, Yu-Shiba-Rusi…
What is the topological dual of the XXZ spin Chain?
Yicheng Tang, Pradip Kattel, Natan Andrei
We construct a dual symmetry-protected topological (SPT) Hamiltonian for the symmetric anisotropic spin- Heisenberg chain-a model that has traditionally been us…
Competing color superconductivity and color Kondo effect in quark matter
Pradip Kattel, Abay Zhakenov, Natan Andrei
The competition between bulk color superconductivity and the localized screening of a heavy quark impurity, analogous to the Kondo effect, leads to a rich spectrum of phenomena in…
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…
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…
Two Channel Kondo behavior in the quantum XX chain with a boundary defect
Yicheng Tang, Pradip Kattel, J. H. Pixley +1
We demonstrate that a boundary defect in the single spin- quantum chain exhibits two-channel Kondo physics. Due to the presence of the defect, the edge spin fract…
Kondo overscreening in the presence of superconductivity
Pradip Kattel, Abay Zhakenov, Natan Andrei
We consider a model describing a system where the superconductivity competes with the overscreened Kondo effect. The model consists of a single spin quantum impurity…
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…
Quantum Zeno Effect in Noisy Integrable Quantum Circuits for Impurity Models
Yicheng Tang, Pradip Kattel, J. H. Pixley +1
We theoretically study the open quantum system dynamics (in the Trotterized limit) of integrable quantum circuits in the presence of onsite dephasing noise with a spin-$\frac{1}{2}…
Edge Spin fractionalization in one-dimensional spin- quantum antiferromagnets
Pradip Kattel, Yicheng Tang, J. H. Pixley +1
We show that a gapped spin- chain with antiferromagnetic (AFM) order exhibits in the thermodynamic limit exponentially localized fractional edge modes when the…
A spin chain with non-Hermitian symmetric boundary couplings: exact solution, dissipative Kondo effect, and phase transitions on the edge
Pradip Kattel, Parameshwar R. Pasnoori, J. H. Pixley +1
We construct an exactly solvable symmetric non-Hermitian model where a spin isotropic quantum Heisenberg spin chain is coupled to two spin$-\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…
The Kondo effect in the quantum spin chain
Pradip Kattel, Yicheng Tang, J. H. Pixley +1
We investigate the boundary phenomena that arise in a finite-size spin chain interacting through an interaction with a spin impurity located at its edge. Up…
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…