Conductance quantization in metallic nanostructures

• Processo: 96/12546-0
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Vigência: 01 de abril de 1997 - 31 de dezembro de 2000
• Área do conhecimento: Ciências Exatas e da Terra - Física - Física da Matéria Condensada
• Pesquisador responsável: Daniel Mario Ugarte
• Beneficiário: Daniel Mario Ugarte
• Instituição Sede: Associação Brasileira de Tecnologia de Luz Síncrotron (ABTLuS). Ministério da Ciência, Tecnologia e Inovação (Brasil). Campinas , SP, Brasil
• Assunto(s): Nanofios Pontos quânticos Efeito Hall quântico fracionário
• Palavra(s)-Chave do Pesquisador: Mesoscopic | Point Contact | Quantum Effects | Transport Properties

Resumo

In this project, we will study the quantized conductance of nanowires or point contacts in the ballistic regime. In particular, we have already observed that quantum point contacts (QPC) generated by mechanically vibrating macroscopic wires, display many cases of non-integer quantized conductance values. Here, we will concentrate in the origine of these fractional quantum conductance effects. To address this problem, we suggest to perform precise measurement of the fractional values, and operate the QPC in UHV chamber. The clean environment of this instrument will allow the study of contamination/impurity effects. In addition, we intend to build a mechanically controllable break junctions where metallic nanostructures will be obtained with the use of the precise and fine piezo element based manipulation system, where the nanowire may be elongated in a controlled way, both from the point of view of time scale and mechanical stability. (AU)

Publicações científicas

(Referências obtidas automaticamente do Web of Science e do SciELO, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores)

RODRIGUES‚ V.; FUHRER‚ T.; UGARTE‚ D.. Signature of atomic structure in the quantum conductance of gold nanowires. Physical Review Letters, v. 85, n. 19, p. 4124-4127, 2000. (96/12546-0, 98/13501-6)

RODRIGUES‚ V.; UGARTE‚ D.. Real-time imaging of atomistic process in one-atom-thick metal junctions. Physical Review B, v. 63, n. 7, p. 073405, 2001. (96/12546-0, 98/13501-6)

RODRIGUES‚ V.; UGARTE‚ D.. Metal nanowires: atomic arrangement and electrical transport properties. Nanotechnology, v. 13, n. 3, p. 404, 2002. (98/13501-6, 96/12546-0)