85 citations · 461 across the 27 of their papers we have counts for
27 papers
Exciton condensation from level repulsion: application to bilayer graphene
Harley D. Scammell, Oleg P. Sushkov
Exciton condensation in semiconductors and semimetals has long been predicted but remains elusive. In a semiconductor, condensation occurs when the exciton binding energy matches t…
Zener tunnelling in biased bilayer graphene via analytic continuation of semiclassical theory
Harley Scammell, Oleg P. Sushkov
Employing a semiclassical method based on analytic continuation, we compute the electron-hole pair production rate in biased bilayer graphene subject to an in-plane electric field.…
Screening of the band gap in electrically biased bilayer graphene: From Hartree to Hartree-Fock
Jack N. Engdahl, Zeb E. Krix, Oleg P. Sushkov
It is well known that a direct band gap may be opened in bilayer graphene via the application of a perpendicular electric field (bias). The bias and the chemical potential are cont…
Transverse magnetic focusing in two-dimensional hole gases
Yik K. Lee, Jackson S. Smith, Hong Liu +4
Two-dimensional hole gases (2DHGs) have strong intrinsic spin-orbit coupling and could be used to build spin filters by utilising transverse magnetic focusing (TMF). However, with…
Quantum magnetic oscillations in the absence of closed electron trajectories
Z. E. Krix, O. A. Tkachenko, V. A. Tkachenko +4
Quantum magnetic oscillations in crystals are typically understood in terms of Bohr-Sommerfeld quantisation, the frequency of oscillation is given by the area of a closed electron…
Artificial electrostatic crystals: a new platform for creating correlated quantum states
Daisy Q. Wang, Zeb Krix, Olga A. Tkachenko +7
The electronic properties of solids are determined by the crystal structure and interactions between electrons, giving rise to a variety of collective phenomena including supercond…
Probing Fermi surface parity with spin resolved transverse magnetic focussing
M. J. Rendell, S. D. Liles, S. Bladwell +6
Measurements of the Fermi surface are a fundamental technique for determining the electrical and magnetic properties of solids. In 2D systems, the area and diameter of the Fermi su…
Electrical control of the Zeeman spin splitting in two-dimensional hole systems
Elizabeth Marcellina, Ashwin Srinivasan, Dmitry Miserev +6
Semiconductor holes with strong spin-orbit coupling allow all-electrical spin control, with broad applications ranging from spintronics to quantum computation. Using a two-dimensio…
Multiple universalities in order-disorder magnetic phase transitions
H. D. Scammell, O. P. Sushkov
Phase transitions in isotropic quantum antiferromagnets are associated with the condensation of bosonic triplet excitations. In three dimensional quantum antiferromagnets, such as…
Mechanisms for strong anisotropy of in-plane g-factors in hole based quantum point contacts
D. S. Miserev, A. Srinivasan, O. A. Tkachenko +5
In-plane hole g-factors measured in quantum point contacts based on p-type heterostructures strongly depend on the orientation of the magnetic field with respect to the electric cu…
Dimensional reduction of the Luttinger Hamiltonian and g-factors of holes in symmetric two-dimensional semiconductor heterostructures
D. S. Miserev, O. P. Sushkov
The spin-orbit interaction of holes in zinc-blende semiconductors is much stronger than that of electrons. This makes the hole systems very attractive for possible spintronics appl…
Non-equilibrium quantum mechanics: A 'hot quantum soup' of paramagnons
H. D. Scammell, O. P. Sushkov
Motivated by recent measurements of the lifetime (decay width) of paramagnons in quantum antiferromagnet TlCuCl3, we investigate paramagnon decay in a heat bath and formulate an ap…
Effects of Coulomb screening and disorder on artificial graphene based on nanopatterned semiconductor
O. A. Tkachenko, V. A. Tkachenko, I. S. Terekhov +1
A residual disorder in the gate system is the main problem on the way to create artificial graphene based on two-dimensional electron gas. The disorder can be significantly screene…
Violation of the Spin Statistics Theorem and the Bose-Einstein Condensation of Particles with Half Integer Spin
H. D. Scammell, O. P. Sushkov
We consider the Bose condensation of particles with spin 1/2. The condensation is driven by an external magnetic field. Our work is motivated by ideas of quantum critical deconfine…
Topological Insulating States in Laterally Patterned Ordinary Semiconductors
O. P. Sushkov, A. H. Castro Neto
We propose that ordinary semiconductors with large spin-orbit coupling (SOC), such as GaAs, can host stable, robust, and {\it tunable} topological states in the presence of quantum…
Binding of a mobile hole by an impurity potential in the t-J model: parity breaking
O. P. Sushkov, J. Oitmaa
We revisit the problem of a single hole moving in the background of the two dimensional Heisenberg antiferromagnet. The hole is loosely bound by an impurity potential. We show that…
Two-dimensional randomly-frustrated spin 1/2 Heisenberg model
J. Oitmaa, O. P. Sushkov
We investigate the properties of S=1/2 Heisenberg clusters with random frustration using exact diagonalizations. This is a model for a quantum spin glass. We show that the average…
Charge ordering and antiferromagnetic exchange in layered molecular crystals of the theta type
Ross H. McKenzie, J. Merino, J. B. Marston +1
We consider the electronic properties of layered molecular crystals of the type theta-DA, where A is an anion and D is a donor molecule such as BEDT-TTF [where BEDT-TTF is bis-…
Excitation spectrum of the S=1/2 quantum spin ladder with frustration: elementary quasiparticles and many-particle bound states
V. N. Kotov, O. P. Sushkov, R. Eder
We study the excitation spectrum of the two-chain S=1/2 Heisenberg spin ladder with additional inter-chain second-neighbor frustrating interactions. The one and two-particle excita…
Local magnetic impurities in the 2D quantum Heisenberg antiferromagnet
V. N. Kotov, J. Oitmaa, O. Sushkov
We consider the two-dimensional (2D) quantum Heisenberg antiferromagnet at zero temperature with two types of locally frustrating perturbations - an isolated ferromagnetic bond (FM…
Criteria for the onset of chaos in finite Fermi systems
V. V. Flambaum, G. F. Gribakin, O. P. Sushkov
The paper in its present form has been withdrawn.
The role of g-wave pairing and Josephson tunneling in high Tc superconductors
P. V. Shevchenko, O. P. Sushkov
The implications of the two-pocket Fermi surface for macroscopic quantum phenomena are considered. We demonstrate that in the case of the two-pocket Fermi surface the g-wave pairin…
Temperature dependence of the electron chemical potential in YBa2Cu3O
A. V. Dotsenko, O. P. Sushkov
We study the behaviour of the electronic chemical potential in YBa2Cu3O near the superconducting transition using the spin-wave exchange theory of pairing. We find that the experim…
Many Body Correlation Corrections to Superconducting Pairing in Two Dimensions.
M. Yu. Kuchiev, O. P. Sushkov
We demonstrate that in the strong coupling limit (the superconducting gap is as large as the chemical potential ), which is relevant to the high- superconductivity, the…