131 citations · 452 across the 15 of their papers we have counts for
15 papers
Zamba2-VL Technical Report
Hassan Shapourian, Kasra Hejazi, Olabode M. Sule +1
We present Zamba2-VL, a suite of vision-language models built on Zamba2, a hybrid language-model architecture combining Mamba2 state-space layers with a small number of shared tran…
ZAYA1-VL-8B Technical Report
Hassan Shapourian, Kasra Hejazi, Olabode M. Sule +1
We present ZAYA1-VL-8B, a compact mixture-of-experts vision-language model built upon our in-house language model, ZAYA1-8B. Despite its compact size, ZAYA1-VL achieves performance…
Adiabatic quantum imaginary time evolution
Kasra Hejazi, Mario Motta, Garnet Kin-Lic Chan
We introduce an adiabatic state preparation protocol which implements quantum imaginary time evolution under the Hamiltonian of the system. Unlike the original quantum imaginary ti…
Simulating quantum circuit expectation values by Clifford perturbation theory
Tomislav Begušić, Kasra Hejazi, Garnet Kin-Lic Chan
The classical simulation of quantum circuits is of central importance for benchmarking near-term quantum devices. The fact that gates belonging to the Clifford group can be simulat…
Symmetry protected entanglement in random mixed states
Kasra Hejazi, Hassan Shapourian
Symmetry is an important property of quantum mechanical systems which may dramatically influence their behavior in and out of equilibrium. In this paper, we study the effect of sym…
Heterobilayer moiré magnets: moiré skyrmions and the commensurate-incommensurate transition
Kasra Hejazi, Zhu-Xi Luo, Leon Balents
We study untwisted heterobilayers of ferromagnetic and antiferromagnetic van der Waals materials, with in particular a Dzyaloshinskii-Moriya interaction in the ferromagnetic layer.…
Hybrid Wannier Chern bands in magic angle twisted bilayer graphene and the quantized anomalous Hall effect
Kasra Hejazi, Xiao Chen, Leon Balents
We propose a method for studying the strong interaction regimes in twisted bilayer graphene using hybrid Wannier functions, that are Wannier-like in one direction and Bloch-like in…
Moiré magnets
Kasra Hejazi, Zhu-Xi Luo, Leon Balents
We introduce a general framework to study moiré structures of two-dimensional Van der Waals magnets using continuum field theory. The formalism eliminates quasiperiodicity and allo…
Landau levels in twisted bilayer graphene and semiclassical orbits
Kasra Hejazi, Chunxiao Liu, Leon Balents
Twisted bilayer graphene has been argued theoretically to host exceptionally flat bands when the angle between the two layers falls within a magic range near 1.1. This is n…
Floquet spin and spin-orbital Hamiltonians and doublon-holon generations in periodically driven Mott insulators
Kasra Hejazi, Jianpeng Liu, Leon Balents
We consider Mott insulators driven by periodic coherent laser radiation, using both single orbital and multi-orbital models, noting that the latter is of more interest in solid sta…
Multiple topological transitions in twisted bilayer graphene near the first magic angle
Kasra Hejazi, Chunxiao Liu, Hassan Shapourian +2
Recent experiments have observed strongly correlated physics in twisted bilayer graphene (TBG) at very small angles, along with nearly flat electron bands at certain fillings. A go…
Rodlike counterions at heterogeneously charged surfaces
Ali Naji, Kasra Hejazi, Elnaz Mahgerefteh +1
We study the spatial and orientational distribution of rodlike counterions (such as mobile nanorods) as well as the effective interaction mediated by them between two plane-paralle…
Floquet engineering of multi-orbital Mott insulators: applications to orthorhombic titanates
Jianpeng Liu, Kasra Hejazi, Leon Balents
We consider driving multi-orbital Mott insulators using laser radiation. We derive general expressions for periodically driven spin-orbital models using time-dependent perturbation…
Hydrodynamic Waves in an Anomalous Charged Fluid
Navid Abbasi, Ali Davody, Kasra Hejazi +1
We study the collective excitations in a relativistic fluid with an anomalous current. In dimensions at zero chemical potential, in addition to ordinary sound modes we…
No-faster-than-light-signaling implies linear evolutions. A re-derivation
Angelo Bassi, Kasra Hejazi
There is a growing interest, both from the theoretical as well as experimental side, to test the validity of the quantum superposition principle, and of theories which explicitly v…