Browsing by Author "Chui, S. T."

Now showing 1 - 5 of 5

Open Access
Impurity effect on the two-dimensional-electron fluid-solid transition in zero field
(American Physical Society, 1995) Chui, S. T.; Tanatar, Bilal
We investigate the effect of impurities on the electron fluid-solid transition with parameters appropriate for the system recently studied by Pudalov et al. The nature of the crystalline state at T=0 in the presence of impurities is studied with the relaxation technique. The solid-fluid transition is studied via perturbation calculation and Monte Carlo simulation. The transition density is found to shift from 37 for the pure system to 7.5, close to that observed experimentally. At this small value of rs, the fluid energy is sensitive to the spin polarization but the solid is not, suggesting possible interesting magnetic behavior. © 1995 The American Physical Society.
Open Access
Metal-insulator transitions in bilayer electron-hole systems in transition metal dichalcogenides
(American Physical Society, 2021-11-29) Chui, S. T.; Wang, N.; Tanatar, Bilal
We investigated metal-insulator transitions for double-layer two-dimensional electron-hole systems in transition metal dichalcogenides stacked on opposite sides of thin layers of boron nitride. The interparticle interaction is calculated by including the screening due to the polarization charges at different interfaces, including that at the encapsulation and at the substrate of experimental structures. We compute and compare the energies of the metallic electron-hole plasma and the proposed insulating exciton solid with fixed-node diffusion Monte Carlo simulation including the high valley degeneracy of the electron bands. We found that for some examples of current experimental structures, the transition electron/hole density is in an experimentally accessible range between 4.1×10 12cm−2 and 14.5×10 12cm−2 for spacer thicknesses between 2.5 and 7.5 nm. Our result raises the possibility of exploiting this effect for logic device applications.
Open Access
Phase diagram of the two-dimensional quantum electron freezing with external impurities
(American Physical Society, 1997) Chui, S. T.; Tanatar, Bilal
We discuss the phase diagram of the quantum electron solid-fluid transition in the presence of impurities in zero magnetic fields. This is based on recent improved understanding of the response function in both the fluid and the solid phases.
Open Access
Quantum Monte Carlo simulation study of two-dimensional electrons with impurities
(TÜBİTAK, 1995) Chui, S. T.; Tanatar, Bilal
Open Access
Response function of the 2D quantum electron solid
(Institute of Physics Publishing Ltd., 1995) Tanatar, Bilal; Chui, S. T.
We study the static density response function of the 2D quantum electron solid with analytic and quantum Monte Cadlo techniques. The ‘longitudinal‘ response function at small and intennediate momentum transfer from the simulation is well approximated by the analytic results using phonons alone, provided the Debye-Waller factor is included. The ‘transverse’ response function and the large momentum transfer longitudinal response function from simulations are larger than the analytic results from confdbutions with phonons alone.