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Novel Materials

Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Novel Materials

Quantum systems

Quantum phenomena in electron transport are studied in quantum point contacts, quantum wires, quantum rings and quantum wire networks. The quantum structures are made by micro- and nanolithography techniques from semiconductor GaAs- and InAs-based heterostructures hosting low-dimensional high-mobility electron gases. We study the effects of electrical fields, low- and high-magnetic fields, temperature and non-thermal equilibrium on charge, spin and thermal transport properties in two, one and zero dimensional structures (2D, 1D, 0D). We are particularly interested in the cross-over behaviour from quasi-2D to quasi-1D, quantum coherence and interactions leading to decoherence in extended quasi-1D networks. Materials presently under investigation are GaAs-based and InAs-based heterostructures.

 

Selected Publications

 

Thermal energy and charge currents in multi-terminal nanorings
T. Kramer, C. Kreisbeck, C. Riha, O. Chiatti, S. S. Buchholz, A. D. Wieck, D. Reuter, and S. F. Fischer
AIP Advances 6, 065306 (2016).
DOI:10.1063/1.4963812
Short abstract

Heat flow, transport and fluctuations in etched semiconductor quantum wire structures
C. Riha, O. Chiatti, S. S. Buchholz, D. Reuter, A. D. Wieck, and S. F. Fischer
Phys. Status Solidi A 213, 571-581 (2016).
DOI:10.1002/pssa.201532551
Short abstract
Special Issue

Electrical and terahertz magnetospectroscopy studies of laser-patterned micro- and nanostructures on InAs-based heterostructures
O. Chiatti, S. S. Buchholz, C. Heyn, W. Hansen, M. Pakmehr, B. D. McCombe, and S. F. Fischer
Appl. Phys. Lett. 106, 052102 (2015).
DOI: 10.1063/1.4907571
Short abstract

Mode-selected heat flow through a one-dimensional waveguide network
C. Riha, P. Miechowski, S. S. Buchholz, O. Chiatti, A. D. Wieck, D. Reuter, and S. F. Fischer
Appl. Phys. Lett. 106, 083102 (2015).
DOI: 10.1063/1.4908052
Short abstract

THz Magneto-Photoresponse Spectroscopy of Two-Dimensional Electrons in an InAs/InGaAs/InAlAs Inserted-Channel
M. Pakmehr, A. Khaetskii, B. D. McCombe, O. Chiatti, S. F. Fischer, C. Heyn, and W. Hansen
J. Infrared Milli. Terahz. Waves 36, 291 (2015).
DOI: 10.1007/s10762-014-0126-4
Short abstract

Electron waveguide interferometers for spin-dependent transport experiments
O. Chiatti, S. S. Buchholz, U. Kunze, D. Reuter, A. D. Wieck, and S. F. Fischer
Phys. Status Solidi B 251, No. 9, 1753–1763 (2014).
DOI: 10.1002/pssb.201350229
Short abstract
Special Issue "Semiconductor Spintronics"

Noise thermometry in a narrow two-dimensional electron gas and thermal gradients across a quasi-one-dimensional interferometer
S. S. Buchholz, E. Sternemann, O. Chiatti, D. Reuter, A. D. Wieck, and S. F. Fischer
Phys. Rev. B 85, 225301 (2012).
DOI: 10.1103/PhysRevB.85.235301

Many-body enhanced nonlinear conductance resonance in quantum channels
J. E. Han, S. F. Fischer, S. S. Buchholz, U. Kunze, D. Reuter, and A. D. Wieck
Phys. Rev. B
84, 193302 (2011).
DOI: 10.1103/PhysRevB.84.193302

Mode-filtered electron injection into a waveguide interferometer
S. S. Buchholz, U. Kunze, D. Reuter, A. D. Wieck, and S. F. Fischer
Appl. Phys. Lett. 98, 102111 (2011).
DOI: 10.1063/1.3563714

Control of the transmission phase in an asymmetric four-terminal Aharonov-Bohm interferometer
S. S. Buchholz, S. F. Fischer, U. Kunze, M. T. Bell, D. Reuter, and A. D. Wieck
Phys. Rev. B
82, 045432 (2010).
DOI: 10.1103/PhysRevB.82.045432

Aharonov-Bohm phase shift in a multi-terminal asymmetric quantum ring
S. S. Buchholz, S. F. Fischer, U. Kunze, D. Reuter, and A. D. Wieck
Physica E: Low-dimensional Systems and Nanostructures
42, 1099-1102 (2010).
DOI: 10.1016/j.physe.2009.11.123

Nonlocal Aharonov-Bohm conductance oscillations in an asymmetric quantum ring
S. S. Buchholz, S. F. Fischer, U. Kunze, D. Reuter, and A. D. Wieck
Appl. Phys. Lett.
94, 022107 (2009).
DOI: 10.1063/1.3069281

Vertically coupled quantum wires in a longitudinal magnetic field
L. G. Mourokh, A. Y. Smirnov, and S. F. Fischer
Appl. Phys. Lett. 90, 132108-1-3 (2007).
DOI: 10.1063/1.2717147

Energy spectroscopy of controlled coupled quantum-wire states
S. F. Fischer, G. Apetrii, U. Kunze, D. Schuh, and G. Abstreiter
Nature Physics 2, 91-96 (2006).
DOI: 10.1038/nphys205

Tunnel-coupled one-dimensional electron systems with large subband separations
S. F. Fischer, G. Apetrii, U. Kunze, D. Schuh, and G. Abstreiter
Phys. Rev. B 74, 115324_1-7 (2006).
DOI: 10.1103/PhysRevB.74.115324

In-plane tunneling between one- and two-dimensional electron systems
J. L. Deborde, S. F. Fischer, U. Kunze, D. Reuter, and A. D. Wieck
Physica E
34, 522-525 (2006).
DOI: 10.1016/j.physe.2006.03.025

Magnetotransport spectroscopy of spatially coincident coupled electron waveguides
S. F. Fischer, G. Apetrii, U. Kunze, D. Schuh, and G. Abstreiter
Phys. Rev. B 71, 195330 (6 pages) (2005).
DOI: 10.1103/PhysRevB.71.195330

Influence of processing parameters on the transport properties of quantum point contacts fabricated with an atomic force microscope
G. Apetrii, S. F. Fischer, U. Kunze, D. Reuter, and A. D. Wieck
Semicond. Sci. Technol. 17, 735-739 (2002).
DOI: 10.1088/0268-1242/17/7/317

Control of the confining potential in ballistic constriction using a persistent charging effect
S. F. Fischer, S. Skaberna, G. Apetrii, U. Kunze, D. Reuter, and A. D. Wieck
Appl. Phys. Lett. 81 (15), 2779-2781 (2002).
DOI: 10.1063/1.1511278

 

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