A chain with random hydrophobic-hydrophilic charges is studied in the presence of an interface separating a polar from a non-polar solvent. Within a Gaussian variational approach in replica space, a transition is found, from a high-temperature region, where the chain is delocalized, to a low-temperature region, where the chain is localized at the interface. The transition temperature diverges as the neutrality of the chain is approached. Our results are in agreement with an Imry-Ma type argument by Garel et al. (Europhys. Lett., 8 (1989) 9). The problem of replica symmetry breaking is also addressed, and the replica-symmetric solution is found to be unstable.

A variational approach to the localization transition of heteropolymers at interfaces

TROVATO, ANTONIO;MARITAN, AMOS
1999

Abstract

A chain with random hydrophobic-hydrophilic charges is studied in the presence of an interface separating a polar from a non-polar solvent. Within a Gaussian variational approach in replica space, a transition is found, from a high-temperature region, where the chain is delocalized, to a low-temperature region, where the chain is localized at the interface. The transition temperature diverges as the neutrality of the chain is approached. Our results are in agreement with an Imry-Ma type argument by Garel et al. (Europhys. Lett., 8 (1989) 9). The problem of replica symmetry breaking is also addressed, and the replica-symmetric solution is found to be unstable.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2459268
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 23
  • ???jsp.display-item.citation.isi??? 18
social impact