Search arXiv⌕ Search
Home/Archive/arXiv

arXiv · 1602.06340

Temperature and Electric Field Induced Metal-Insulator Transition in Atomic Layer Deposited Vanadium Dioxide Thin Films

Marko J. Tadjer·Virginia D. Wheeler·Brian P. Downey·Zachary R. Robinson·David J. Meyer·Charles R. Eddy, Jr.·Fritz J. Kub
View original source ↗Read source document ↗Export metadata ↓

Abstract

Amorphous vanadium dioxide (VO$_{2}$) films deposited by atomic layer deposition (ALD) were crystallized with an ex situ anneal at 660-670 $°$C for 1-2 hours under a low oxygen pressure (10$^{-4}$ to 10$^{-5}$ Torr). Under these conditions the crystalline VO$_{2}$ phase was maintained, while formation of the V$_{2}$O$_{5}$ phase was suppressed. Electrical transition from the insulator to the metallic phase was observed in the 37-60 $°$C range, with a R$_{ON}$/R$_{OFF}$ ratio of up to about 750 and critical transition temperature of 7-10 $°$C. Electric field applied across two-terminal device structures induced a reversible phase change, with a room temperature transition field of about 25 kV/cm in the VO$_{2}$ sample processed with the 2 hr long anneal. Both the width and slope of the field induced MIT hysteresis were dependent upon the VO$_{2}$ crystalline quality.

Explore related subjects

cond-mat.str-elcond-mat.mes-hall

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Marko J. Tadjer, Virginia D. Wheeler, Brian P. Downey, Zachary R. Robinson, David J. Meyer, Charles R. Eddy, Jr., Fritz J. Kub. 2016-02-19. Temperature and Electric Field Induced Metal-Insulator Transition in Atomic Layer Deposited Vanadium Dioxide Thin Films. https://doi.org/10.1016/j.sse.2017.06.018

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Symmetry-resolved topology from interacting Green's functions

Topological phases in narrow-gap materials often arise from a delicate interplay of spin-orbit coupling (SOC) and electron correlation, making their prediction sensitive to the underlying electronic-structure approximation. Electronic topology is commonly characterized using effective one-body Hamiltonians, but this approach becomes delicate near gap closings and does not reveal how a band inversion is realized in the interacting spectrum. Here we introduce a multi-messenger analysis that combines three complementary readouts of a single interacting Green's function: the Fu-Kane invariant of the topological Hamiltonian, the symmetry-resolved spectral function, and the symmetry-resolved orbital occupation. Together, they identify the topological class, resolve band connectivity, and track the orbital character of the inversion. We implement this framework within fully self-consistent relativistic GW, treating SOC and electronic correlation on equal footing while eliminating dependence on a density-functional starting point. Applied to strain-tunable $α$-Sn, the approach distinguishes its competing zero-gap, Dirac-semimetal, and topological-insulator regimes and provides an internally consistent description of their common band-inversion mechanism. More broadly, this framework offers a frequency-resolved route to diagnosing correlated topology across both gapped and near-critical states.

cond-mat.str-el↗
arXiv2026

Spectroscopic signatures of Kohn anomaly in a topological crystalline insulator

Topological crystalline insulators extend the concept of topological insulators by hosting surface states protected by crystallographic symmetry. Their topological phase transitions arise from spin-orbit-driven band inversion in the bulk electronic structure, reshaping the low-energy electronic environment and its coupling to lattice excitations. While the electronic aspects of band topology are well established, the corresponding dynamics of lattice and electron-phonon interactions remain largely unexplored. Here, we report a pronounced softening of a low-energy surface phonon mode across the topological phase transition in Pb$_{0.77}$Sn$_{0.23}$Se, revealed by temperature-dependent time-domain terahertz spectroscopy. Unlike the well-known phonon softening in ferroelectrics, this effect does not signal a structural instability but instead reflects electronic reconstruction. We attribute the softening to the spectroscopic manifestations of a Kohn anomaly, indicating a strong coupling between lattice vibrations and Dirac-like surface electrons in the topological phase. Consistently, the phonon linewidth deviates from the standard anharmonic temperature dependence, further evidencing enhanced electron-phonon coupling. The observed changes in phonon frequency and linewidth at around 120 K are consistent with the reported topological phase transition temperature in this material. Our results thus provide a spectroscopic route for the distinct identification of the onset of a topological phase.

cond-mat.str-el↗
arXiv2026

Approximating thermodynamic equilibrium observables of quasi one-dimensional magnetic molecules and chains by thermal DMRG - a user perspective

Density matrix renormalization group methods or tensor network methods in general can not only be used to determine ground states but also to evaluate thermal equilibrium properties. Although convergence is superior for one-dimensional quantum spin systems with nearest neighbor exchange and open boundary conditions, the hope is that these methods can as well be employed to approximate magnetic observables of magnetic molecules with more complex interaction patterns. Here, we assume the position of a user and study the accuracy that can realistically be achieved for several archetypical quasi one-dimensional structures using the TenPy suite. In our study, we aim at systems that are too large for exact diagonalization or Krylov space methods.

cond-mat.str-el↗