Giant asymmetry of the longitudinal magnetoresistance in high-mobility two-dimensional electron gas on a cylindrical surface

Abstract

A giant asymmetry in the magnetoresistance was revealed in high-mobility, two-dimensional electron gas on a cylindrical surface. The longitudinal resistance along the magnetic-field gradient impressed by the surface curvature was found to vanish if measured along one of the edges of the curved Hall bar. If the external magnetic field is reversed, then the longitudinal resistance vanishes at the opposite edge of the Hall bar. This asymmetry is analyzed quantitatively in terms of the Landauer-Büttiker formalism.

Transmission gaps from corrugations

“…These results can provide an access to design a curvature-tunable filter. With the advent and development of nanostructure technology, a variety of nanostructures with complex geometries were successfully fabricated, such as corrugated semiconductor films [1][2][3][4][5][6] , rolled-up nanotubes [7][8][9][10][11][12] , Möbius stripes [13][14][15] , peanut-shaped C 60 polymers [16][17][18][19][20] . These successes in experiment found the basis of the emerging nanoelectronics.…”

Molecularly and atomically thin semiconductor and carbon nanoshells

“…1 shows a schematic of the fabricated bent film with the Hall bar. In such bent structures, ballistic electron transport on curved surface [16] and giant magnetoresistance asymmetry (10 3 ) were observed [15]. Figure 1 shows the resistances R xx and R xy as functions of the magnetic field B 0 for different combinations of contacts in the curved InGaAs/GaAs Hall bar.…”

“…One such example is an array of sharp-pointed cold emitters. In the formation of downcast contacts to bent or rolled grapheme layers, there arises a possibility to advantageously use the bent-layer effects, for instance, giant gradients of the surface-normal magnetic-field component and the related giant effects of magnetoresistance asymmetry [15].…”

“…It is the presence of the magnetic-field gradient and the change of its sign on reversing the field polarity that are responsible for the observed magnetoresistance asymmetry. This asymmetry was quantitatively analyzed in terms of the Landauer-Büttiker formalism [15,17].…”

3D heterostructures and systems for novel MEMS/NEMS

“…Conducting nanoshells exhibit unusual quantum properties (see, for instance [65][66][67][68][69]), which can be further controlled by displacing parts of such elastic systems at the nanoscale.…”