Superconductivity-enhanced bias spectroscopy in carbon nanotube quantum dots

被引：53

作者：

Grove-Rasmussen, K. ^{[1
]}

Jorgensen, H. I. ^{[1
]}

Andersen, B. M. ^{[1
]}

Paaske, J. ^{[1
]}

Jespersen, T. S. ^{[1
]}

Nygard, J. ^{[1
]}

Flensberg, K. ^{[1
]}

Lindelof, P. E. ^{[1
]}

机构：

[1] Univ Copenhagen, Nanosci Ctr, Niels Bohr Inst, DK-2100 Copenhagen O, Denmark

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 13期

关键词：

carbon nanotubes; Coulomb blockade; electronic density of states; niobium; quantum dots; superconducting materials; superconductive tunnelling; tunnelling spectra; SUPERCURRENT; JUNCTIONS; TRANSISTORS;

D O I：

10.1103/PhysRevB.79.134518

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study low-temperature transport through carbon nanotube quantum dots in the Coulomb blockade regime coupled to niobium-based superconducting leads. We observe pronounced conductance peaks at finite source-drain bias, which we ascribe to elastic and inelastic cotunneling processes enhanced by the coherence peaks in the density of states of the superconducting leads. The inelastic cotunneling thresholds display a marked dependence on gate voltage caused by different tunneling renormalizations of the two subbands in the nanotube. Finally, we discuss the gate-dependent subgap structure observed in a strongly coupled device with odd electron occupation.

引用

页数：5

共 26 条

[1] Multiple Andreev reflections in a carbon nanotube quantum dot -: art. no. 057005 [J].

Buitelaar, MR ;

Belzig, W ;

Nussbaumer, T ;

Babic, B ;

Bruder, C ;

Schönenberger, C .

PHYSICAL REVIEW LETTERS, 2003, 91 (05)

[2] Quantum dot in the Kondo regime coupled to superconductors -: art. no. 256801 [J].

Buitelaar, MR ;

Nussbaumer, T ;

Schönenberger, C .

PHYSICAL REVIEW LETTERS, 2002, 89 (25)

[3] Kondo universal scaling for a quantum dot coupled to superconducting leads [J].

Buizert, C. ;

Oiwa, A. ;

Shibata, K. ;

Hirakawa, K. ;

Tarucha, S. .

PHYSICAL REVIEW LETTERS, 2007, 99 (13)

[4] Carbon nanotube superconducting quantum interference device [J].

Cleuziou, J. -P. ;

Wernsdorfer, W. ;

Bouchiat, V. ;

Ondarcuhu, T. ;

Monthioux, M. .

NATURE NANOTECHNOLOGY, 2006, 1 (01) :53-59

[5] Gate-tuned high frequency response of carbon nanotube josephson junctions [J].

Cleuziou, J.-P. ;

Wernsdorfer, W. ;

Andergassen, S. ;

Florens, S. ;

Bouchiat, V. ;

Ondarcuhu, Th. ;

Monthioux, M. .

PHYSICAL REVIEW LETTERS, 2007, 99 (11)

[6] Andreev Reflection versus Coulomb Blockade in Hybrid Semiconductor Nanowire Devices [J].

Doh, Yong-Joo ;

De Franceschi, Silvano ;

Bakkers, Erik P. A. M. ;

Komenhoven, Leo P. .

NANO LETTERS, 2008, 8 (12) :4098-4102

[7] Even-odd effect in Andreev transport through a carbon nanotube quantum dot [J].

Eichler, A. ;

Weiss, M. ;

Oberholzer, S. ;

Schoenenberger, C. ;

Levy Yeyati, A. ;

Cuevas, J. C. ;

Martin-Rodero, A. .

PHYSICAL REVIEW LETTERS, 2007, 99 (12)

[8] ELECTRON TUNNELING BETWEEN 2 SUPERCONDUCTORS [J].

GIAEVER, I .

PHYSICAL REVIEW LETTERS, 1960, 5 (10) :464-466

[9] Kondo resonance enhanced supercurrent in single wall carbon nanotube Josephson junctions [J].

Grove-Rasmussen, K. ;

Jorgensen, H. Ingerslev ;

Lindelof, P. E. .

NEW JOURNAL OF PHYSICS, 2007, 9

[10] Gate-dependent tunneling-induced level shifts observed in carbon nanotube quantum dots [J].

Holm, J. V. ;

Jorgensen, H. I. ;

Grove-Rasmussen, K. ;

Paaske, J. ;

Flensberg, K. ;

Lindelof, P. E. .

PHYSICAL REVIEW B, 2008, 77 (16)

← 1 2 3 →