Magnetic-field asymmetry of nonlinear transport in narrow channels with asymmetric hybrid confinement

Brandenstein-Köth, Bettina; Worschech, Lukas; Forchel, Alfred
August 2009
Applied Physics Letters;8/10/2009, Vol. 95 Issue 6, p062106
Academic Journal
The authors realized narrow constrictions in a two-dimensional electron gas (2DEG) with an in-plane asymmetry by means of a hybrid confinement. Unequal sidewalls of the constrictions were formed by combination of a single etched trench in a modulation doped GaAs/AlGaAs heterostructure which cuts through the 2DEG with an adjacent metallic top-gate, which depletes the underlying 2DEG. The two-terminal conductance was analyzed in magnetic fields applied perpendicular to the sample surface. In nonlinear transport, the conductance shows pronounced differences for an inversion of the magnetic field. The asymmetric conductance is related to scattering asymmetries caused by the different sidewalls in the asymmetric constriction.


Related Articles

  • Design of soliton electron lattices in carbon nanotubes by a magnetic field. Belonenko, M. B.; Lebedev, N. G.; Tuzalina, O. Yu. // Russian Physics Journal;Dec2008, Vol. 51 Issue 12, p1262 

    Electron states in the conduction band of carbon nanotubes are studied in the presence of a constant magnetic field perpendicular to the tube axis within the framework of Hubbard's model. Numerical solutions describing electron density waves corresponding to soliton lattices are obtained. The...

  • Fermi liquids in compact astrophysical objects under strong magnetic fields. Pérez-García, M. Ángeles // AIP Conference Proceedings;5/1/2009, Vol. 1122 Issue 1, p372 

    In this contribution we consider the effect of a strong magnetic field in a neutron plasma at low temperatures. Landau’s Fermi liquid parameters are studied for this polarized fermion system using effective nuclear interaction, namely Skyrme and Gogny forces.

  • Effects of Spin-Flavor Conversion in Supernova Neutrino Signal. Yoshida, Takashi; Takamura, Akira; Kimura, Keiichi; Yokomakura, Hidekazu; Kawagoe, Shiou; Kajino, Toshitaka // AIP Conference Proceedings;5/4/2009, Vol. 1120 Issue 1, p298 

    Majorana neutrinos with a finite transition magnetic moment are expected to convert their flavors by spin precession in a strong magnetic field of a supernova. We investigate detailed dependence of the resonant spin-flavor conversions on electron fraction Ye in the innermost region of the...

  • Tunable energy bands and spin filtering in two-dimensional superlattices with spin-orbit interaction. Zhang, R. L.; Li, J.; Qi, D. X.; Hu, Qing; Peng, R. W.; Huang, R. S.; Wang, Mu // Journal of Applied Physics;Apr2012, Vol. 111 Issue 7, p07C325 

    We theoretically investigate the electronic energy bands and spin filtering tuned by Rashba spin-orbit coupling (SOC) and magnetic field in two-dimensional superlattices (2DSLs), where the square rods of quantum barriers, matrix, and wells are imposed periodically. It is shown that electronic...

  • Magnetic Phases in Dense Quark Matter. de la Incera, Vivian // AIP Conference Proceedings;10/26/2007, Vol. 947 Issue 1, p395 

    In this paper I discuss the magnetic phases of the three-flavor color superconductor. These phases can take place at different field strengths in a highly dense quark system. Given that the best natural candidates for the realization of color superconductivity are the extremely dense cores of...

  • Full Discretization Scheme for Linearized Quasi-Static Maxwell’s Equations with a Non-linear Boundary Condition. Zemanová, Viera; Slodicˇka, Marián // AIP Conference Proceedings;9/15/2008, Vol. 1048 Issue 1, p621 

    We study a time dependent eddy current equation for the magnetic field H accompanied with a non-linear degenerate boundary condition, which is a generalization of the classical Silver-Müller condition for a non-perfect conductor. More exactly, the relation between the normal components of...

  • Local magnetic fields in the Mo layer of Mo/Fe multilayer. Murakami, Y.; Fuse, D.; Sakamoto, Y.; Hamada, Y.; Ono, T.; Kitao, S.; Seto, M.; Tanigaki, M.; Saito, T.; Ohkubo, Y. // Hyperfine Interactions;2007, Vol. 179 Issue 1-3, p57 

    Using time-differential perturbed-angular-correlation technique, hyperfine fields at 99Tc (?99Mo) in the Mo layers in polyimide/Fe (10 nm)/[Mo ( t Mo)/Fe (2.0 nm)]120, where t Mo is in the range between 0.4 and 1.5 nm, were measured at room temperature. The values of the magnetic hyperfine field...

  • Soliton wall superlattice charge-density-wave phase in a magnetic field. A. G. Lebed; S. Wu // JETP Letters;Sep2007, Vol. 86 Issue 2, p135 

    A model where phase transitions between the Peierls and periodic soliton wall superlattice (SWS) charge-density-wave phases occur in a magnetic field is proposed. The model accounts for the peculiarities of the electron spectrum in a quasi-one-dimensional conductor (Per)2Pt(mnt)2. Possible...

  • Methods and devices for reversing neutron polarization. Sumbatyan, A. A.; Slyusar’, V. N.; Okorokov, A. I.; Eckerlebe, H. // Instruments & Experimental Techniques;May2009, Vol. 52 Issue 3, p337 

    The merits and demerits of the methods for reversing neutron polarization and of the devices (flippers) for neutron spin flipping relative to the magnetic field are discussed. A flipper capable of operating under problem conditions—when installed on a neutron guide and in vacuum—is...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics