Yogeshwar Prasad

Kangwon National University

We study localization and many-body localization transition in one-dimensional systems in the presence of deterministic quasiperiodic potential. We use single-particle excitations obtained through single-particle Green's function in real space to characterize the localization to delocalization transition. A single parameter scaling analysis of the...

Earlier work [arXiv:1206.2407,arXiv:2206.06085] have shown the band insulator (BI) to superfluid (SF) phase transition in the half-filled bilayer attractive Hubbard model. In this paper we append the effects of random on-site disorder on the single particle properties and two particle pair-pair correlations in that model. Using the determinant quan...

We study many-body localization transition in one dimensional systems in the presence of a deterministic quasi-periodic potential. We focus on single-particle excitations produced in highly excited many-body eigenstates obtained through single-particle Green's function in real space. A finite-size scaling analysis of the ratio of the typical to ave...

We perform the finite-temperature determinant quantum Monte Carlo simulation for the attractive Hubbard model on the half-filled bilayer square lattice. Recent progress on optical lattice experiments lead us to investigate various single-particle properties such as momentum distribution and double occupancies which should be easily measured in cold...

We perform the finite temperature determinant quantum Monte Carlo $(DQMC)$ simulation for the attractive Hubbard model on the half-filled bilayer square lattice. Recent progress on optical lattice experiments lead us to investigate various single-particle properties like momentum distribution and double occupancies which should be easily measured i...

We investigate quench dynamics across many-body localization (MBL) transition in an interacting one-dimensional system of spinless fermions with aperiodic potential. We consider a large number of initial states characterized by the number of kinks Nkinks in the density profile, such that the equal number of sites are occupied between any two consec...

We investigate quench dynamics across many-body localization (MBL) transition in an interacting one dimensional system of spinless fermions with aperiodic potential. We consider a large number of initial states characterized by number of kinks $N_{kinks}$ in the density profile. On the delocalized side of the MBL transition, the dynamics becomes fa...

We study many-body localization (MBL) in a one-dimensional system of spinless fermions with a deterministic aperiodic potential in the presence of random interactions Vij decaying as power-law Vij/(rij)α with distance rij. We demonstrate that MBL survives even for α<1 and is preceded by a broad nonergodic subdiffusive phase. Starting from parameter...

We study many-body localization (MBL) in a one-dimensional system of spinless fermions with a deterministic aperiodic potential in the presence of long-range interactions decaying as power-law $V_{ij}/(r_i-r_j)^\alpha$ with distance and having random coefficients $V_{ij}$. We demonstrate that MBL survives even for $\alpha <1$ and is preceded by a b...

We propose a model to realize a fermionic superfluid state in an optical lattice circumventing the cooling problem. Our proposal exploits the idea of tuning the interaction in a characteristically low entropy state, a band-insulator in an optical bilayer system, to obtain a superfluid. By performing a detailed analysis of the model including fluctu...

We propose a route to realizing a fermionic superfluid state in an optical lattice starting from a band insulator. We show that by increasing the strength of attractive interaction between the fermions in the singlet channel, a band insulator can be driven to a superfluid state in an optical lattice. The band structure is suitably designed to avoid...