Magnetic quantum ratchet effect in (Cd, Mn) Te- and CdTe-based quantum well structures with a lateral asymmetric superlattice

被引：14

作者：

Faltermeier, P. ^{[1
]}

Budkin, G. V. ^{[2
]}

Unverzagt, J. ^{[1
]}

Hubmann, S. ^{[1
]}

Pfaller, A. ^{[1
]}

Bel'kov, V. V. ^{[2
]}

Golub, L. E. ^{[2
]}

Ivchenko, E. L. ^{[2
]}

Adamus, Z. ^{[3
]}

Karczewski, G. ^{[3
]}

Wojtowicz, T. ^{[3
,4
]}

Popov, V. V. ^{[5
,6
]}

Fateev, D. V. ^{[5
]}

Kozlov, D. A. ^{[7
]}

Weiss, D. ^{[1
]}

Ganichev, S. D. ^{[1
]}

机构：

[1] Univ Regensburg, Terahertz Ctr, D-93040 Regensburg, Germany

[2] Ioffe Inst, St Petersburg 194021, Russia

[3] Polish Acad Sci, Inst Phys, Al Lotnikow 32-46, PL-02668 Warsaw, Poland

[4] Int Res Ctr MagTop, Al Lotnikow 32-46, PL-02668 Warsaw, Poland

[5] Saratov Branch, Inst Radio Engn & Elect, Saratov 410019, Russia

[6] Saratov NG Chernyshevskii State Univ, Dept Phys, Saratov 410012, Russia

[7] AV Rzhanov Inst Semicond Phys, Novosibirsk 630090, Russia

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 15期

关键词：

2-DIMENSIONAL ELECTRON-GAS; BROWNIAN MOTORS; TRANSPORT; HETEROSTRUCTURES; SEMICONDUCTORS; TEMPERATURE; GRAPHENE; ARRAYS;

D O I：

10.1103/PhysRevB.95.155442

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the observation of magnetic quantum ratchet effect in (Cd, Mn) Te-and CdTe-based quantum well structures with an asymmetric lateral dual grating gate superlattice subjected to an external magnetic field applied normal to the quantum well plane. A dc electric current excited by cw terahertz laser radiation shows 1/B oscillations with an amplitude much larger as compared to the photocurrent at zero magnetic field. We show that the photocurrent is caused by the combined action of a spatially periodic in-plane potential and the spatially modulated radiation due to the near-field effects of light diffraction. Magnitude and direction of the photocurrent are determined by the degree of the lateral asymmetry controlled by the variation of voltages applied to the individual gates. The observed magneto-oscillations with enhanced photocurrent amplitude result from Landau quantization and, for (Cd, Mn) Te at low temperatures, from the exchange enhanced Zeeman splitting in diluted magnetic heterostructures. Theoretical analysis, considering the magnetic quantum ratchet effect in the framework of semiclassical approach, describes quite well the experimental results.

引用

页数：12

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