Semiconductor Physics Group

Semiconductor Physics Group, Cavendish Laboratory

  Dr Crispin H. W. Barnes

University Lecturer
College Lecturer and Tutor at Girton College.

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Quantum Properties

 Quantum Transport Lecture Notes
 Effective_Mass
 Ballistic_Motion
 Quantum_Hall_Effect
 Quantum_Transport
 Interaction_Effects
 Quantum_Dots
 Quantum_Computation

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Quantum Information

 Quantum Information Lecture Notes

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Contact Info

E-mail: chwb101@cam.ac.uk
Tel:  +44 (0)1223 337487
Fax: +44 (0)1223 337271
Secretary: +44 (0)1223 337482

SP Group
Cavendish Laboratory
J J Thomson Avenue, Cambridge
CB3 0HE, UK

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Current research interests:

Solid state quantum computation.

The simulation and detailed understanding of electronic devices grown epitaxially
with full three-dimensional control over patterning of deposited ionic species.

The development and simulation of non-invasive probes to interacting many-particle systems.

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Research students:

 Alexander Moroz (Graduated)
 Sean Barrett (Graduated)
 Tom Stace (Graduated)
 Shubeur Rahman (Graduated)
 Timur Zaniev (Graduated)
 Roberta Rodriquez
 Christian Lynch
 Adam Thorn
 Masato Yokoi

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Publications

Click here for a full list of my publications in the Semiconductor Physics Group.

[1] Classical dynamics of electrons in quantized-acoustoelectric-current devices A. M. Robinson
and C. H. W. Barnes. Sumitted to Phys. Rev. B

[2] Theory of quasi-one-dimensional electron liquids with spin-orbit coupling.
A.V. Moroz, K. V. Samokhin and C. H. W. Barnes.  To be published in Phys. Rev. B

[3] Quantum computation using electrons trapped by surface acoustic waves.
C. H. W.Barnes, J. M. Shilton and A. M. Robinson. Phys. Rev. B 62, 8410 (2000).

[4] Spin-orbit coupling in interacting quasi-one-dimensional electron systems
A.V. Moroz, K. V. Samokhin and C. H. W Barnes. Phys. Rev. Lett. 84 4164 (2000).

[5] Imaging diffraction-limited electronic collimation from a
non-equilibrium one-dimensional ballistic constriction R. Crook,C.
G. Smith,C. H. W Barnes, et al. J. Phys. Condes-Matt 12 L167
(2000).

[6] Spin-orbit interaction as a source of spectral and transport
properties in quantum wires. A. V. Moroz, C. H. W. Barnes, Phys.
Rev. B 61 R2464 (2000).

[7] The effect of the spin-orbit interaction on the band structure
and conductance of quasi-one-dimensional systems. A. V. Moroz and
C. H. W. Barnes, Phys. Rev. B 60 14272 (1999).

[8] Spin-valve effects in a semiconductor field-effect transistor:
A spintronic device. S. Gardelis, C. G. Smith, C. H. W. Barnes, E.
H. Linfield, D. A. Ritchie, Phys. Rev. B 60 7764-7767 (1999).

[9] Fluctuations and evidence for charging in the quantum hall
effect, D. H. Cobden, C. H. W. Barnes, C. J. B. Ford, Phys. Rev.
Lett. 82 4695-4698 (1999).

[10] Magnetotunneling as a probe of Luttinger-liquid behavior A.
Altland, C. H. W. Barnes, F. W. J. Hekking, A. J. Schofield, Phys.
Rev. Lett 83 1203-1206 (1999).

[11] Magnetization reversal and magnetoresistance in a lateral
spin- injection device, W. Y. Lee, S. Gardelis, B. C. Choi, Y. B.
Xu, C. G. Smith, C. H. W. Barnes, D. A. Ritchie, E. H. Linfield,
J. A. C. Bland, J. Appl. Phys. 85 6682-6685 (1999).

[12]Intrinsic coupling mechanisms between two-dimensional electron
systems in double quantum well structures, C. H. W. Barnes, A. G.
Davies, K. R. Zolleis, M. Y. Simmons and D. A. Ritchie, Phys. Rev.
B  59 7669-7678 (1999).

[13]    Magnetotunneling spectroscopy of one-dimensional wires. B.
Kardynal, C. H. W. Barnes, E. H. Linfield, D. A. Ritchie, K. M.
Brown, G. A. C. Jones, M. Pepper. Phys. Rev. B 55 R1966-1969
(1997).

[14] Resonant transmission through an open quantum dot. C.-T.
Liang, I. M. Castleton, J. E. F. Frost, C. H. W. Barnes, C. G.
Smith, C. J. B. Ford, D. A. Ritchie, and M. Pepper. Phys. Rev. B
55  6723-6726 (1997).

[15] Thermoelectric signature of the N-particle excitation
spectrum of a quantum dot. A. S. Dzurak, C. G. Smith, C. H. W.
Barnes, M. Pepper, C. T. Liang, D. A. Ritchie and G. A. C. Jones.
Phys. Rev. B 55 R10197-10200 (1997).

[16] Hybrid transport properties between single and double layer
behaviour in double quantum well structures. A. G. Davies, C. H.
W. Barnes, K. J. Zollies, J. T. Nicholls, M. Y. Simmons and D. A.
Ritchie. Phys. Rev. B  54  R17331-17334 (1996).

[17] A direct measurement of the band structure of a one
dimensional surface superlattice. B. Kardynal, C. H. W. Barnes, E.
H. Linfield, D. A. Ritchie, K. M. Brown, G. A. C. Jones and M.
Pepper. Phys. Rev. Lett. 76 3802-3805 (1996).

[18] Equilibrium tunneling between 2-dimensional and
quasi-one-dimensional electron gases in devices fabricated by
in-situ focused ion-beam lithography. B. Kardynal, E. H. Linfield,
D. A. Ritchie, K. M. Brown, C. H. W. Barnes, G. A. C. Jones, M.
Pepper. Appl. Phys. Lett., 68  826-828 (1996).

[19] Theory of semiballistic wave-propagation. A. Mosk, T. M.
Nieuwenhuizen and C. Barnes. Phys. Rev. B  53  15914-15931 (1996).

[20] General picture of Quantum Hall transitions in antidots. D.
R. Mace, C. H. W. Barnes, G. Faini, D. Mailly, M. Y. Simmons, C.
J. B. Ford and M. Pepper. Phys. Rev. B  52 R8672-8675 (1995).

[21] The Aharonov-Bohm effect in the fractional quantum Hall
regime. C. J. B. Ford, P. J. Simpson, I. Zailer, J. D. F.
Franklin, C. H. W. Barnes, J. E. F. Frost, D. A. Ritchie, M.
Pepper.  J. Phys.: Condens. Matter.  6 L725-730 (1994).

[22] Inter-Landau level scattering in a self-consistent potential.
M. Stopa, C. Barnes, T. Iitaka, Y. Aoyagi and T. Sugano. Quantum
Coherence  and Decoherence, Foundations of Quantum Mechanics in
the Light of New Technology, p211-214, edited by K. Fujikawa and
Y. A. Ono,  Elsevier, Amsterdam (1996).

[23]    Edge states, band structure, and the Hall effect in 2-
dimensional lattice structures quantum dot arrays and the tight
binding model. R. Akis, C. Barnes and G. Kirczenow. Canadian
Journal of Physics  73 147-162 (1995).

[24] Introducing directionality to Anderson localization: the
transport properties of quantum railroads. C. Barnes, B. L.
Johnson, G. Kirczenow. Canadian Journal of Physics  72 559-567
(1994). (Won best paper of the year award 1994).

[25]    Generalised Hofstadter picture for lattices with more than
one degree of freedom per site. R. Akis, C. Barnes, G. Kirczenow.
Phys. Rev. A  50 4930-4940 (1994).

[26] Computer simulations and edge state analysis of the Hall
effect in two dimensional quantum dot arrays connected to phase
randomising reservoirs. R. Akis, C. Barnes, B. L. Johnson G.
Kirczenow. Phys. Rev. B  47 16382-16390 (1993).

[27]    Ballistic conductor connected to disordered reservoirs:
Suppression of the mesoscopic conductance fluctuations. D. L.
Maslov, C. Barnes, and G. Kirczenow. Phys. Rev. B  48 2543-1987
(1993).

[28] Quantum railroads: Introducing directionality to Anderson
localization. C. Barnes, B. L. Johnson and G. Kirczenow. Phys.
Rev. Lett.  70 1159-1162 (1993).

[29]    Ballistic transport in a disordered environment: Why is
conductance quantisation observable. D. L. Maslov, C. Barnes and
G. Kirczenow. Phys. Rev. Lett.  70 1984-1997 (1993).

[30]    Theory of the Hall effect in two-dimensional quantum dot
arrays. B. L. Johnson, C. Barnes and G. Kirczenow. Phys. Rev. B.
46 15302-15308 (1992).

[31] Multiple scattering of waves in random media: a transfer
matrix approach. C. Barnes and J. B. Pendry.  Proc. Roy. Soc. A
435 185-196 (1991).

[32]    The localization length and density of states of 1D
disordered systems. C. Barnes, Tan Wei-chao and J. B. Pendry.  J.
Phys.: Condens. Matter.  3 5297-5305 (1991).

[33]    The distribution of the reflection phase of disordered
conductors. C. Barnes and J. M. Luck.  J. Phys. A.: Math. Gen.  23
1717-1734 (1990).

[34]    Reflection of waves from disordered systems. J. B. Pendry
and C. Barnes.  J. Phys.: Condens. Matter.  1 7901-7912 (1989).

Conferences

[C1] A direct measurement of the effects of Fermi energy
oscillations in quasi-1D systems L.D. Macks, C. H. W. Barnes, J.
T. Nicholls, W. R. Tribe, D. A. Ritchie, P. D. Rose, E. H.
Linfield and M. Pepper, ( PB.25 EP2DS 13 1999)

[C2] Imaging electron and conduction band hole trajectories
through one and two series constrictions R. Crook, C. G. Smith, C.
H. W. Barnes, M. Y. Simmons and D. A. Ritchie (MB.5 EP2DS 13 1999)

[C3] Spin-valve effects in a two-dimensional electron gas system
S. Gardelis, C. G. Smith, W. Y. Lee, C. H. W. Barnes, E. H.
Linfield, D. A. Ritchie, and J. A. C. Bland, (THB.4 EP2DS 13 1999)

[C4] A study of the relative strengths of spin-isospin phases in a
strongly coupled double quantum well system. C. H. W. Barnes, A.
G. Davies, K. R. Zolleis, M. Y. Simmons and D. A. Ritchie, Physica
B, 258 130-135 (1998).

[C5] The investigation of 1D and 2D phenomena using double-layer
electron systems. J. T. Nicholls, N. P. R. Hill, B. Kardynal, N.
Turner, E. H. Linfield, D. A. Ritchie, C. H. W. Barnes, G. A. C.
Jones, M. Pepper ,  Physica E, 3 52-57 (1998).

[C6] Probing the transition from insulating to metallic behaviour
using bilayer electron systems. A. G. Davies, C. H. W. Barnes, K.
R. Zolleis, M. Y. Simmons and D. A. Ritchie. Physica B, 258
417-423 (1998).

[C7] Inhomogeneous electron scattering as a signature of the
transition from insulating to metallic behaviour. A. G. Davies, C.
H. W. Barnes, K. R. Zolleis, M. Y. Simmons and D. A. Ritchie.
(ICPS 13 Jerusalem (1998)).

[C8]    Possible observation of an exchange-driven phase
transition in a double quantum well system.A. G. Davies, C. H. W.
Barnes, K. R. Zolleis, M. Y. Simmons and D. A. Ritchie. (ICPS 13
Jerusalem (1998)).

[C9] Many particle ground state of quantum Hall systems. D. H.
Cobden, C. H. W. Barnes, C. J. B. Ford, J. T. Nicholls and M.
Pepper. (ICPS 13 Jerusalem (1998)).

[C10] Experimental determination of spectral densities in
quasi-one-dimensional electron gases. B. Kardynal, C. H. W.
Barnes, E. H. Linfield, D. A. Ritchie, J. T. Nicholls, K. M. Brown
and M. Pepper, Physica B, 251  175-179 (1998).

[C11]   Thermopower measurements of semiconductor quantum dots. A.
S. Dzurak, C. G. Smith, C. H. W. Barnes, M. Pepper, L.
Martin-Moreno, C. T. Liang, D. A. Ritchie and G. A. C. Jones,
Physica B, 251  281-285 (1998).

[C12]Onset of subband locking in double quantum well structures.
K. R. Zollies, C. H. W. Barnes, A. G. Davies, D. A. Ritchie, M. Y.
Simmons and M. Pepper, Physica B, 251 850-854 (1998).

[C13]   Subband locking as the precursor to hybrid
double-single-layer behaviour in a double quantum well structure.
A. G. Davies, C. H. W. Barnes, K. J. Zollies, J. T. Nicholls, M.
Y. Simmons and D. A. Ritchie.  Wurtzberg Proc. 12th HMFPS p411-414
(1997).

[C14] Level Locking as the signature of the double to single-layer
transition in double quantum well structures. C. H. W. Barnes, A.
G. Davies, K. J. Zollies, J. T. Nicholls, M. Y. Simmons and D. A.
Ritchie. Berlin Proc. 23rd ICPS p2175-2178 (1997).

[C15] The effect of perpendicular magnetic field on tunneling
between one and two dimensional electron gases. B. Kardynal, E. H.
Linfield, C. H. W. Barnes, D. A. Ritchie, K. R. Zollies, K. M.
Brown, J. T. Nicholls, G. A. C. Jones and M. Pepper. Berlin Proc
23rd ICPS p2203-2206 (1997).

[C16] Detection of the oscillation of the Fermi energy of a 2DEG.
C. H. W. Barnes, D. R. Mace, G. Faini, D. Mailly, M. Y. Simmons,
C. J. B Ford, M. Pepper. Surf. Sci. 362 608-612 (1996).

[C17] Aharonov-Bohm oscillations in adjacent edge states around a
controllable tuneable obstacle. D. R. Mace, C. H. W. Barnes, C. J.
B. Ford, P. J. Simpson, M. Pepper, M. Y. Simmons, G. Faini and D.
Mailly. Vancouver Proc. 22nd ICPS 1991-1994 (1995).

[C18] The modelling of inter-edge-state backscattering from
quantum dots. C. Barnes and T. Sugano.  Hokkaido Proc. EFM p23-27
(1993).

[C19] Novel quantum hall phenomena in arrays of quantum dots. G.
Kirczenow, B. L. Johnson and C. Barnes. Nanostructured Materials.
3 125-133 (1993).