6 papers
Inter-band coherence effects in disordered crystals: beyond the non-crossing approximation
Zhanning Wang, James H. Cullen, Roberto Raimondi +1
We develop a quantum kinetic theory for Bloch electrons driven by a uniform dc electric field, extending the nonequilibrium density-matrix formalism beyond the non-crossing approxi…
Orbital Hall effect in spin-3/2 hole-doped semiconductors and its implications for orbitronics
James H. Cullen, Zhanning Wang, Dimitrie Culcer
State-of-the-art magnetic devices rely on faster, more efficient memory elements. A major recent advance is the discovery of orbital torques, which use the orbital angular momentum…
Ge as an orbitronic platform: giant in-plane orbital magneto-electric effect in a 2-dimensional hole gas
James H. Cullen, Dimitrie Culcer
Increasing demand for computational power has initiated the hunt for energy efficient and stable memory devices. This is the overarching motivation behind the recent rise of \texti…
Giant orbital Hall effect due to the bulk states of 3D topological insulators
James H. Cullen, Hong Liu, Dimitrie Culcer
The highly efficient torques generated by 3D topological insulators make them a favourable platform for faster and more efficient magnetic memory devices. Recently, research into h…
Quantum geometry and dipolar dynamics in the orbital magneto-electric effect
James H. Cullen, Daniel P. Arovas, Roberto Raimondi +1
We show that the orbital magneto-electric effect (OME) -- the generation of a steady-state orbital angular momentum density -- is partly the result of a nonequilibrium dipole momen…
Quantum correction to the orbital Hall effect
Hong Liu, James H. Cullen, Daniel P. Arovas +1
Evaluations of the orbital Hall effect (OHE) have only retained inter-band matrix elements of the position operator. Here we evaluate the OHE including all matrix elements of the p…