Colloids

Colloidal crystals are an ideal system in which to study the general problem of ordering and dynamics in 2D, since the particle size permits direct imaging of the particle locations and motion. A considerable amount of work has been conducted on the melting of 2D colloidal crystals in the absence of a substrate. In addition, a number of experimental and theoretical studies have considered colloidal crystallization and melting in 2D systems with periodic 1D and 2D substrates, where a rich variety of crystalline states can be stabilized. Colloid crystals are also ideal for studying the ordering and dynamics of an elastic media interacting with random substrates, a problem that is relevant to a wide variety of systems such as superconducting vortices, Wigner crystals, and charge-density waves. Open issues include the nature of the dynamical response to applied forces, as well as whether an order to disorder transition occurs as the strength of the random substrate increases.

Papers:

1. Cooperative behavior and pattern formation in mixtures of driven and nondriven colloidal assemblies
   C. Reichhardt and C.J. Olson Reichhardt
   submitted to Phys Rev.
   Online version
   

2. Dynamics, rectification, and fractionation for colloids on flashing substrates
   A. Libal, C. Reichhardt, B. Janko, and C.J. Olson Reichhardt
   submitted to Phys. Rev. Lett.
   Online version
   

3. Crossover from intermittent to continuum dynamics for locally driven colloids
   C. Reichhardt and C.J. Olson Reichhardt
   Phys. Rev. Lett 96 028301 (2006).
   Online version
   

4. Pinning and dynamics of colloids on one dimensional periodic potentials
   C. Reichhardt and C.J. Olson Reichhardt
   Phys. Rev. E 72 032401 (2005).
   Online version
   

   Ordering and melting in colloidal molecular crystal mixtures
   C. Reichhardt and C.J. Olson Reichhardt
   Phys. Rev. E 71 062403 (2005).
   Online version
   

5. Reentrant disordering of colloidal molecular crystals on 2D periodic substrates
   M. Mikulis, C.J. Olson Reichhardt, C. Reichhardt, R.T. Scalettar, and G.T. Zimanyi
   J. Phys: Condens Matter 16 7909 (2004).
   Online version
   

6. Directional locking effects and dynamics for particles driven through a colloidal lattice
   C. Reichhardt and C.J. Olson Reichhardt
   Phys. Rev. E 69 041405 (2004).
   Online version
   

7. Local melting and drag for a particle driven through a colloidal crystal
   C. Reichhardt and C.J. Olson Reichhardt
   Phys. Rev. Lett 92 108301 (2004).
   Online version
   

8. Structure and melting of two-species charged clusters in a parabolic trap
   J.A. Dracco, C.J. Olson Reichhardt, C. Reichhardt and B. Janko
   Phys. Rev. E 68 06040(R) (2003).
   Online version
   

9. Frustration and melting colloidal molecular crystals
   C.J. Olson Reichhardt and C. Reichhardt
   J. Phys. A: Math. Gen. 36 5841 (2003).
   Online version
   

10. Fluctuating topological defects in 2D liquids: Heterogeneous motion and noise
    C. Reichhardt and C.J. Olson Reichhardt
    Phys. Rev. Lett 90 095504 (2003).
    Online version
    

11. Depinning by fracture in a glassy background
    M.B. Hastings, C.J. Olson Reichhardt and C. Reichhardt
    Phys. Rev. Lett 90 098302 (2003).
    Online version
    

12. Colloidal dynamics on disordered substrates
    C. Reichhardt and C.J. Olson
    Phys. Rev. Lett 89 078301 (2002).
    Online version
    

13. Rectification and phase locking for particles on two dimensional periodic substrates
    C. Reichhardt, C.J. Olson, and M.B. Hastings
    Phys. Rev. Lett. 89, 024101 (2002).
    Online version

14. Novel colloidal crystalline states on two dimensional periodic substrates
    C. Reichhardt and C.J. Olson
    Phys. Rev. Lett. 88, 248301 (2002).
    Online version
    

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Last Modified: 6/16/02