Tunable Kondo Physics in a Carbon Nanotube Double Quantum Dot

被引：32

作者：

Chorley, S. J. ^{[1
]}

Galpin, M. R. ^{[2
]}

Jayatilaka, F. W. ^{[2
]}

Smith, C. G. ^{[1
]}

Logan, D. E. ^{[2
]}

Buitelaar, M. R. ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[2] Univ Oxford, Dept Chem, Phys & Theoret Chem Lab, Oxford OX1 3QZ, England

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 15期

基金：

英国工程与自然科学研究理事会;

关键词：

METALS; STATES; FIELD; IMPURITIES; TRANSITION; MOLECULE; SYSTEM; POINT; MODEL;

D O I：

10.1103/PhysRevLett.109.156804

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate a tunable two-impurity Kondo system in a strongly correlated carbon nanotube double quantum dot, accessing the full range of charge regimes. In the regime where both dots contain an unpaired electron, the system approaches the two-impurity Kondo model. At zero magnetic field the interdot coupling disrupts the Kondo physics and a local singlet state arises, but we are able to tune the crossover to a Kondo screened phase by application of a magnetic field. All results show good agreement with a numerical renormalization group study of the device.

引用

页数：5

共 34 条

[1] EXACT CRITICAL-THEORY OF THE 2-IMPURITY KONDO MODEL [J].

AFFLECK, I ;

LUDWIG, AWW .

PHYSICAL REVIEW LETTERS, 1992, 68 (07) :1046-1049

[2] CONFORMAL-FIELD-THEORY APPROACH TO THE 2-IMPURITY KONDO PROBLEM - COMPARISON WITH NUMERICAL RENORMALIZATION-GROUP RESULTS [J].

AFFLECK, I ;

LUDWIG, AWW ;

JONES, BA .

PHYSICAL REVIEW B, 1995, 52 (13) :9528-9546

[3]

ALEXANDER S, 1964, PHYS REV, V133, P1594

[4] Zero-bias conductance in carbon nanotube quantum dots [J].

Anders, Frithjof B. ;

Logan, David E. ;

Galpin, Martin R. ;

Finkelstein, Gleb .

PHYSICAL REVIEW LETTERS, 2008, 100 (08)

[5] LOCALIZED MAGNETIC STATES IN METALS [J].

ANDERSON, PW .

PHYSICAL REVIEW, 1961, 124 (01) :41-&

[6]

[Anonymous], 1993, TheKondo Problem to Heavy Fermions

[7] REVIEW OF TECHNIQUES IN THE LARGE-N EXPANSION FOR DILUTE MAGNETIC-ALLOYS [J].

BICKERS, NE .

REVIEWS OF MODERN PHYSICS, 1987, 59 (04) :845-939

[8]

Bork J, 2011, NAT PHYS, V7, P901, DOI [10.1038/NPHYS2076, 10.1038/nphys2076]

[9] 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)

[10] Multiwall carbon nanotubes as quantum dots -: art. no. 156801 [J].

Buitelaar, MR ;

Bachtold, A ;

Nussbaumer, T ;

Iqbal, M ;

Schönenberger, C .

PHYSICAL REVIEW LETTERS, 2002, 88 (15) :4

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