9 papers
Field-Free Transverse Aharonov--Bohm Phase Gate for an Orbital -Qubit
Ju Gao, Fang Shen
The Aharonov--Bohm (AB) effect is usually read out through phase differences associated with spatially distinct electron paths. We show that confined orbital modes provide a same-p…
Heliciton-Assisted Chirality-Induced Spin Selectivity from Helical Dirac Current
Ju Gao, Fang Shen
We develop a quantized screw-mode mechanism for chirality-induced spin selectivity (CISS). The corresponding quantum, termed a heliciton, is a screw-symmetric environmental excitat…
Helical Dirac Current with Local Coupling to a Chiral Potential
Ju Gao, Fang Shen
We show that a propagating electron wave in the lowest cylindrical channel carries a spin-resolved helical conserved current, and connect this current texture to its local chiral c…
Helical Current of Propagating Dirac Electrons and Geometric Coupling to Chiral Environments
Ju Gao, Fang Shen
We show that a propagating Dirac electron with intrinsic spin generically carries a real--space helical conserved current, even in the absence of orbital angular momentum. Using ex…
Bell Correlations from Prepared Coherence in Entangled Dirac Wavepackets
Ju Gao, Fang Shen
Bell correlations are usually formulated for an ideal spin singlet, for which the Bell--CHSH combination reaches the maximal quantum value \(B=-2\sqrt{2}\), independent of detector…
Angular--Momentum--Resolved Aharonov--Bohm Coupling Energy
Ju Gao, Fang Shen
We present an angular--momentum--resolved energetic formulation of the Aharonov--Bohm (AB) response for a confined Dirac electron based on two gauge--invariant interaction function…
Electron Wave-Spin Qubit
Ju Gao, Fang Shen
As a continuation of our earlier investigations into electron wave--spin~\citep{GaoJOPCO22,EntropyEvaSpin2024}, we analyze the electron spin and its qubit in a cavity by treating t…
Electron wave spin in a cavity
Ju Gao, Fang Shen
Our study reveals electron spin in a cavity as a stable circulating current density, characterized by a torus topology. This current density circulates concentrically beyond the ca…
Evanescent Electron Wave Spin
Ju Gao, Fang Shen
This study demonstrates the existence of an evanescent electron wave outside both finite and infinite quantum wells by solving the Dirac equation and ensuring the continuity of the…