Department of Physics

Moulton Hall 311

Campus Box 4560

Normal,
Il
61790-4560

309-438-8756

# Laser-assisted Relativistic Electron Motion

When an atomic electron is accelerated by super-intense electromagnetic radiation from a laser source, its velocity may approach the speed of light. The physics of a quantum electron undergoing such relativistic motion is studied by solving the time-dependent Dirac equation. The physics of a classical electron under the same conditions is studied by solving the classical relativistic equations of motion. Click here to see our computer movies of the newly discovered cycloatoms.

### Selected Publications

"Critique of the Wigner tunneling speed and a proposed alternative"

P. Krekora, Q. Su, and R. Grobe, **Phys. Rev. A,** 64, 022105 (2001). PDF(124 kB)

"Dynamical signature in spatial spin distributions of relativistic electrons"

P. Krekora, Q. Su, and R. Grobe, **J. Phys. B,** 34, 2795-2806 (2001). PDF(193 kB)

"Dirac theory of ring-shaped electron distributions in cycloatoms"

P. Krekora, R.E. Wagner, Q. Su, and R. Grobe, **Phys. Rev. A,** 63, 25404 (2001). PDF(69 kB)

"Position dependent tunneling speed for particles under a barrier"

P. Krekora, Q. Su, and R. Grobe, in **"Super-Intense Laser Physics",** ed. By B. Piraux, and K. Rzazewski, (Kluwer Academic Publishers, Dordrecht, 2001) pp 369-378

"Effects of relativity on the time-resolved tunneling of electron wave packets"

P. Krekora, Q. Su, and R. Grobe, **Phys. Rev. A, **63, 32107 (2001). PDF(108 kB)

"Relativistic electron spin motion in cycloatoms"

Q. Su, P.J. Peverly, R.E. Wagner, P. Krekora, and R. Grobe, **Optics Express,** 8, 51-58 (2001). PDF(114 kB)

"Examples of Classical and Genuinely Quantum Relativistic Phenomena"

Q. Su, and R. Grobe, **Multiphoton Processes,** eds, L.F. DiMauro, R.R. Freeman, and K.C. Kulander (AIP, New York, 2001) P. 655.

"Relativistic dynamics of atomic electrons in resonant magnetic-laser fields"

R.E. Wagner, Q. Su and R. Grobe,** Phys. Rev. Lett.** 84, 3282-3285 (2000). PDF(85kB)

"Classical versus quantum dynamics for a driven relativistic oscillator"

R.E. Wagner, P.J. Peverly, Q. Su and R. Grobe,** Phys. Rev. A** 61, 35402-35404 (2000).

"Fractional resonances in relativistic magnetic-laser-atom interactions"

P.J. Peverly, R.E. Wagner, Q. Su, and R. Grobe, **Laser Phys.** 10, 303 (2000).

"Spatial electron clouds at fractional and multiple magneto-optical resonances"

Q. Su, R.E. Wagner, P.J. Peverly, and R. Grobe,** Frontiers of Laser Physics** and **Quantun Optics,**

eds, A. Xu, S. Xie, S.-Y. Zhu and M.O. Scully, (Springer, Berlin)117-123 (2000)

"Numerical Approach to Solve the Time-dependent Dirac Equation"

J.W. Braun, Q. Su, and R. Grobe, **Phys. Rev. A** 59, 604-612, (1999).

"High Order Harmonic Generation in Relativistic Ionization of Magnetically Dressed Atoms"

R.E. Wagner, Q. Su, and R. Grobe, **Phys. Rev. A,** 60, 3233, (1999).

"Dynamics of Wave Packets in Inhomogeneous and Homogeneous Magnetic Fields"

J.C. Csesznegi, G.H. Rutherford, Q. Su and R. Grobe, **Laser Phys.** 9, 41-47, (1999).

"Relativistic Suppression of Wave Packet Spreading"

Q. Su, B.A. Smetanko and R. Grobe, **Optics Express** 2, 277-281 (1998). PDF(177 kB)

"Wave Packet Motion in Relativistic Electric Fields"

Q. Su, B.A. Smetanko and R. Grobe, **Laser Phys.** 8, 93-101 (1998).

"Essential States in the Relativistic Theory of Electron-photon Interactions"

Q. Su and J.H. Eberly, **Phys. Rev. A** 35, 2962 (1987).