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140 papers
Theory of extrinsic contributions to the full orbital current
James H Cullen, Dimitrie Culcer
The orbital Hall effect (OHE) underpins the emerging field of orbitronics. A complete quantum-mechanical evaluation of the usual orbital-current operator must retain all matrix ele…
Orbital-geometric spin response: inter-band coherence versus orbital-to-spin conversion
Dimitrie Culcer
Orbitronics seeks to convert orbital angular momentum (OAM) into spin, but its microscopic dynamics is not understood. Here I show that, at moderate spin-orbit coupling, an electri…
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…
Zitterbewegung velocity in semiclassical electron dynamics
Dimitrie Culcer
Zitterbewegung plays a major role in electron dynamics in solids, yet is not captured in conventional semiclassical treatments. Here, starting from the quantum Liouville equation,…
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…
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…