Academic Staff

Dimitrie Culcer

BA, MPhys Oxford, PhD The University of Texas at Austin

Lecturer

 

Department and Research Groups


Research Interests

I study systems with strong spin-orbit interactions, such as topological insulators and electrons and holes in semiconductor nanostructures. My interests also include graphene, whose Hamiltonian resembles that of spin-orbit coupled systems, with the real spin replaced by a lattice pseudospin degree of freedom.

In these systems I am interested primarily in nonequilibrium phenomena such as charge and spin transport, and spin relaxation and dephasing. Of particular interest to me is the interplay of spin-orbit coupling with strong interactions and disorder, as well as with external electric and magnetic fields. Topics I have focused on lately include screening and Friedel oscillations, magnetic instabilities, the Kondo effect, and disorder effects such as weak localisation.

My second area of research is concerned with quantum dots, specifically using confined spins and pseudospins for quantum computing. I am interested in qubit architectures, entanglement schemes, as well as transport, relaxation and dephasing of spins and pseudospins in quantum dots. Dephasing is especially important in quantum computing, since it is equivalent to a loss of information, and can hamper single-qubit operations as well as entanglement. It can come from noise, phonons, as well as other mechanisms that we do not understand.

Selected Publications

  1. J. Wang and D. Culcer, Suppression of the Kondo Resistivity Minimum in Magnetic Topological Insulators, arXiv:1308.1952.
  2. L. Jiang, C. H. Yang, Z. Pan, A. Rossi, A. S. Dzurak, and D. Culcer, Coulomb interaction and valley-orbit coupling in Si quantum dots, Phys. Rev. B 88, 085311, (2013).
  3. Xintao Bi, Peiru He, E. M. Hankiewicz, R. Winkler, G. Vignale, and D. Culcer, Anomalous spin precession and spin Hall effect in semiconductor quantum wells, Phys. Rev. B 88, 035316 (2013).
  4. D. Culcer and N. M. Zimmerman, Dephasing of Si singlet-triplet qubits due to charge and spin defects, Appl. Phys. Lett. 102, 232108 (2013).
  5. Weizhe Edward Liu, Allan H. MacDonald, and D. Culcer, Electron-electron interactions in non-equilibrium bilayer graphene, Phys. Rev. B 87, 085408 (2013).
  6. D. Culcer, Transport in three-dimensional topological insulators: theory and experiment, Physica E 44, 860 (2012) (Invited review for special issue on topological insulators).
  7. D. Culcer, A. Saraiva, B. Koiller, X. Hu, and S. Das Sarma, Valley-based noise-resistant quantum computation using Si quantum dots, Physical Review Letters 108, 126804, (2012).
  8. Yue Wu and D. Culcer, Coherent electrical rotations of valley states in Si quantum dots using the phase of the valley-orbit coupling, Phys. Rev. B 86, 035321 (2012).
  9. D. Culcer, Linear response theory of interacting topological insulators, Phys. Rev. B 84, 235411 (2011).
  10. D. Culcer and S. Das Sarma, Anomalous Hall response of topological insulators, Phys. Rev. B 83, 245441 (2011).
  11. D. Culcer, E. H. Hwang, T. D. Stanescu, and S. Das Sarma, Two-dimensional surface charge transport in topological insulators, Phys. Rev. B 82, 155457 (2010).
  12. D. Culcer and R. Winkler, External gates and transport in biased bilayer graphene, Phys. Rev. B 79, 165422 (2009).

 

Contact Details 

Mail Address

School of Physics
The University of New South Wales
SYDNEY 2052
Australia

Email Address

Phone Number

61 2 9385 0123

Facsimile Number

61 2 9385 6060