Physics and Technology of Semiconductor Quantum Nanostructures
Lead Research Organisation:
University of Cambridge
Department Name: Physics
Abstract
We are accustomed to the use of electricity in every day life, this is based on the flow of electrons through materials which have a high conductivity such as metals. At low temperatures the laws of quantum mechanics prevail and now an electron does not behave as a particle but rather as a wave, which reflects the probability of finding an electron in a particular place. An entirely new range of phenomena flow from this change in the physics and this is most pronounced in very small devices, called nanostructures. The purpose of this grant is to enable the most advanced nanostructures to be fabricated and new physical phenomena to be sought in them. In addition to the new physics that will be found, new methods of transmitting and handling data will emerge, which will be of great benefit to both existing and future industries yet to be born.
Publications
Astley M
(2006)
Examination of multiply reflected surface acoustic waves by observing acoustoelectric current generation under pulse modulation
in Physical Review B
Schneble R
(2006)
Quantum-dot thermometry of electron heating by surface acoustic waves
in Applied Physics Letters
Kataoka M
(2006)
Experimental investigation of the surface acoustic wave electron capture mechanism
in Physical Review B
Astley M
(2006)
Examination of surface acoustic wave reflections by observing acoustoelectric current generation under pulse modulation
in Applied Physics Letters
Rushforth A
(2006)
Fano effect and Kondo effect in quantum dots formed in strongly coupled quantum wells
in Physical Review B
Kataoka M
(2006)
The effect of pulse-modulated surface acoustic waves on acoustoelectric current quantization
in Journal of Applied Physics
Keogh J
(2006)
Closely spaced, independently contacted electron-hole bilayers in GaAs-AlGaAs heterostructures
in Physica E: Low-dimensional Systems and Nanostructures
Kataoka M
(2006)
Single-electron transfer between double quantum dots defined by surface acoustic waves
in Physica E: Low-dimensional Systems and Nanostructures
Danneau R
(2006)
Zeeman splitting in ballistic hole quantum wires.
in Physical review letters
Crook R
(2006)
Conductance quantization at a half-integer plateau in a symmetric GaAs quantum wire.
in Science (New York, N.Y.)
Kataoka M
(2007)
Single-Electron Population and Depopulation of an Isolated Quantum Dot Using a Surface-Acoustic-Wave Pulse
in Physical Review Letters
Astley MR
(2007)
Energy-dependent tunneling from few-electron dynamic quantum dots.
in Physical review letters
Schneble R
(2007)
Collapse of nonequilibrium charge states in an isolated quantum dot using surface acoustic waves
in Physical Review B
Blumenthal M
(2007)
Gigahertz quantized charge pumping
in Nature Physics
Hickey M
(2007)
Strongly bias-dependent spin injection from Fe into n -type GaAs
in Physical Review B
Graham A
(2007)
Energy-level pinning and the 0.7 spin state in one dimension: GaAs quantum wires studied using finite-bias spectroscopy
in Physical Review B
Siegert C
(2007)
The possibility of an intrinsic spin lattice in high-mobility semiconductor heterostructures
in Nature Physics
Clarke W
(2007)
Impact of long- and short-range disorder on the metallic behaviour of two-dimensional systems
in Nature Physics
Wright S
(2008)
Enhanced current quantization in high-frequency electron pumps in a perpendicular magnetic field
in Physical Review B
Danneau R
(2008)
0.7 Structure and zero bias anomaly in one-dimensional hole systems
in Physica E: Low-dimensional Systems and Nanostructures
Danneau R
(2008)
0.7 Structure and zero bias anomaly in ballistic hole quantum wires.
in Physical review letters
Pfaendler S
(2008)
Stable conductance plateaus from ridge wires grown on a patterned substrate
in Applied Physics Letters
Croxall AF
(2008)
Anomalous coulomb drag in electron-hole bilayers.
in Physical review letters
Siegert C
(2008)
Effect of a perpendicular magnetic field on the zero-bias anomaly in two-dimensional electron systems
in Physical Review B
Das Gupta K
(2008)
Selective breakdown of quantum Hall edge states and non-monotonic Coulomb drag in a GaAs-AlGaAs electron-hole bilayer
in Physica E: Low-dimensional Systems and Nanostructures
Huang D
(2008)
Effects of inelastic capture, tunneling escape, and quantum confinement on surface acoustic wave-dragged photocurrents in quantum wells
in Journal of Applied Physics
Kataoka M
(2008)
Investigation of single-electron dynamics in tunnelling between zero- and one-dimensional states
in Physica E: Low-dimensional Systems and Nanostructures
Siegert C
(2008)
Oscillatory Hall effect in high-mobility two-dimensional electron gases
in Physical Review B
Baenninger M
(2008)
Magnetic-field-induced instabilities in localized two-dimensional electron systems
in Physical Review B
Sfigakis F
(2008)
Spin effects in one-dimensional systems
in Journal of Physics: Condensed Matter
Baenninger M
(2008)
Quantisation of hopping magnetoresistance prefactor in strongly correlated two-dimensional electron systems
in Physica E: Low-dimensional Systems and Nanostructures
Astley M
(2008)
Quantized acoustoelectric current in an InGaAs quantum well
in Journal of Applied Physics
Ho L
(2008)
Effect of screening long-range Coulomb interactions on the metallic behavior in two-dimensional hole systems
in Physical Review B
Graham AC
(2008)
Anticrossing of spin-split subbands in quasi-one-dimensional wires.
in Physical review letters
Kataoka M
(2008)
Electron population control of a highly isolated quantum dot using surface-acoustic waves
in Physica E: Low-dimensional Systems and Nanostructures
Astley M
(2008)
Measurement of Coulomb-energy-dependent tunnelling rates in surface-acoustic-wave-defined dynamic quantum dots
in Physica E: Low-dimensional Systems and Nanostructures
Chen T
(2008)
Bias-controlled spin polarization in quantum wires
in Applied Physics Letters
Sfigakis F
(2008)
Kondo Effect from a Tunable Bound State within a Quantum Wire
in Physical Review Letters
Sarkozy S
(2009)
Low temperature transport in undoped mesoscopic structures
in Applied Physics Letters
Wright S
(2009)
Parallel quantized charge pumping
in Physical Review B
Goswami S
(2009)
Highly enhanced thermopower in two-dimensional electron systems at millikelvin temperatures.
in Physical review letters
Hew WK
(2009)
Incipient formation of an electron lattice in a weakly confined quantum wire.
in Physical review letters
Croxall A
(2009)
Possible effect of collective modes in zero magnetic field transport in an electron-hole bilayer
in Physical Review B
Chen T
(2009)
Odd-even spin effects and variation of g factor in a quasi-one-dimensional subband
in Physical Review B
Chen T
(2009)
Non-Kondo zero-bias anomaly in quantum wires
in Physical Review B
Smith L
(2009)
Row coupling in an interacting quasi-one-dimensional quantum wire investigated using transport measurements
in Physical Review B
Kataoka M
(2009)
Coherent time evolution of a single-electron wave function.
in Physical review letters
Sarkozy S
(2009)
Zero-bias anomaly in quantum wires
in Physical Review B
Córcoles A
(2009)
Nuclear spin coherence in a quantum wire
in Physical Review B
Description | The work discovered a number of unexpected features of spin polarisation and difference in energy between the different spin directions. It was found possible to induce a coincidence in energy between the spin directions by means of a magnetic field which produced a number of spin instabilities. We developed an electron pump which delivered a quantised current near nanoamps which is within range of highly accurate measurements of electron charge by standards laboratories. |
Exploitation Route | Many groups worldwide are using the patterned gate techniques which we developed. The electron pump has been taken up by standards laboratories including NPL with whom we have a good collaboration. |
Sectors | Digital/Communication/Information Technologies (including Software),Electronics,Energy |
URL | http://www.electronicsweekly.com/news/research-news/device-rd/cambridge-team-closer-to-working-quantum-computer-2007-04/ |
Description | Theory of Electron Transport in Semiconductor Nanostructures and Collaborative Experiments |
Organisation | University of Liverpool |
Department | Department of Physics |
Country | United Kingdom |
Sector | Academic/University |
PI Contribution | Collaboration and explanation of experiments as well as suggestions of new experiments. These collaborations started before this award but are ongoing and have contributed to the work in the award. |
Collaborator Contribution | Many ideas and experimental contributions. Allocation of a Dilution Refrigerator in Cape Town for the experimental programme. Dr Blumenthal who is now in CapeTown took a Ph.D in Cambridge and was supervised by Pepper, he is now a lecturer there and has allocated a dilution refrigerator to our collaboration on electron pumps. We have an excellent collaboration with the Taiwan group which has provided new insights into spin-orbit coupling. The Bar Ilan and CUNY collaborations are in the area of theory and have produced some important insights into the behaviour of electrons in nanostructures which is continuing. |
Impact | 4 good publications |
Description | Theory of Electron Transport in Semiconductor Nanostructures and Collaborative Experiments |
Organisation | University of Liverpool |
Department | Department of Physics |
Country | United Kingdom |
Sector | Academic/University |
PI Contribution | Collaboration and explanation of experiments as well as suggestions of new experiments. These collaborations started before this award but are ongoing and have contributed to the work in the award. |
Collaborator Contribution | Many ideas and experimental contributions. Allocation of a Dilution Refrigerator in Cape Town for the experimental programme. Dr Blumenthal who is now in CapeTown took a Ph.D in Cambridge and was supervised by Pepper, he is now a lecturer there and has allocated a dilution refrigerator to our collaboration on electron pumps. We have an excellent collaboration with the Taiwan group which has provided new insights into spin-orbit coupling. The Bar Ilan and CUNY collaborations are in the area of theory and have produced some important insights into the behaviour of electrons in nanostructures which is continuing. |
Impact | 4 good publications |
Description | Theory of Electron Transport in Semiconductor Nanostructures and Collaborative Experiments |
Organisation | University of the Balearic Islands |
Department | Physics |
Country | Spain |
Sector | Academic/University |
PI Contribution | Collaboration and explanation of experiments as well as suggestions of new experiments. These collaborations started before this award but are ongoing and have contributed to the work in the award. |
Collaborator Contribution | Many ideas and experimental contributions. Allocation of a Dilution Refrigerator in Cape Town for the experimental programme. Dr Blumenthal who is now in CapeTown took a Ph.D in Cambridge and was supervised by Pepper, he is now a lecturer there and has allocated a dilution refrigerator to our collaboration on electron pumps. We have an excellent collaboration with the Taiwan group which has provided new insights into spin-orbit coupling. The Bar Ilan and CUNY collaborations are in the area of theory and have produced some important insights into the behaviour of electrons in nanostructures which is continuing. |
Impact | 4 good publications |
Description | Theory of Electron Transport in Semiconductor Nanostructures and Collaborative Experiments |
Organisation | University of the Balearic Islands |
Department | Physics |
Country | Spain |
Sector | Academic/University |
PI Contribution | Collaboration and explanation of experiments as well as suggestions of new experiments. These collaborations started before this award but are ongoing and have contributed to the work in the award. |
Collaborator Contribution | Many ideas and experimental contributions. Allocation of a Dilution Refrigerator in Cape Town for the experimental programme. Dr Blumenthal who is now in CapeTown took a Ph.D in Cambridge and was supervised by Pepper, he is now a lecturer there and has allocated a dilution refrigerator to our collaboration on electron pumps. We have an excellent collaboration with the Taiwan group which has provided new insights into spin-orbit coupling. The Bar Ilan and CUNY collaborations are in the area of theory and have produced some important insights into the behaviour of electrons in nanostructures which is continuing. |
Impact | 4 good publications |