Large, valley-exclusive Bloch-Siegert shift in monolayer WS2

被引：116

作者：

Sie, Edbert J. ^{[1
]}

Lui, Chun Hung ^{[2
]}

Lee, Yi-Hsien ^{[3
]}

Fu, Liang ^{[1
]}

Kong, Jing ^{[4
]}

Gedik, Nuh ^{[1
]}

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

[2] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA

[3] Natl Tsing Hua Univ, Mat Sci & Engn, Hsinchu 30013, Taiwan

[4] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

来源：

SCIENCE | 2017年 / 355卷 / 6329期

关键词：

MOS2; VALLEYTRONICS; POLARIZATION;

D O I：

10.1126/science.aal2241

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Coherent interaction with off-resonance light can be used to shift the energy levels of atoms, molecules, and solids. The dominant effect is the optical Stark shift, but there is an additional contribution from the so-called Bloch-Siegert shift that has eluded direct and exclusive observation in solids. We observed an exceptionally large Bloch-Siegert shift in monolayer tungsten disulfide (WS2) under infrared optical driving. By controlling the light helicity, we could confine the Bloch-Siegert shift to occur only at one valley, and the optical Stark shift at the other valley, because the two effects obey opposite selection rules at different valleys. Such a large and valley-exclusive Bloch-Siegert shift allows for enhanced control over the valleytronic properties of two-dimensional materials.

引用

页码：1066 / 1069

页数：4

共 29 条

[1] STARK EFFECT IN RAPIDLY VARYING FIELDS [J].

AUTLER, SH ;

TOWNES, CH .

PHYSICAL REVIEW, 1955, 100 (02) :703-722

[2] THE ELECTROMAGNETIC SHIFT OF ENERGY LEVELS [J].

BETHE, HA .

PHYSICAL REVIEW, 1947, 72 (04) :339-341

[3] Magnetic resonance for nonrotating fields [J].

Bloch, F ;

Siegert, A .

PHYSICAL REVIEW, 1940, 57 (06) :522-527

[4] Valley-selective circular dichroism of monolayer molybdenum disulphide [J].

Cao, Ting ;

Wang, Gang ;

Han, Wenpeng ;

Ye, Huiqi ;

Zhu, Chuanrui ;

Shi, Junren ;

Niu, Qian ;

Tan, Pingheng ;

Wang, Enge ;

Liu, Baoli ;

Feng, Ji .

NATURE COMMUNICATIONS, 2012, 3

[5] Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS2 [J].

Chernikov, Alexey ;

Berkelbach, Timothy C. ;

Hill, Heather M. ;

Rigosi, Albert ;

Li, Yilei ;

Aslan, Ozgur Burak ;

Reichman, David R. ;

Hybertsen, Mark S. ;

Heinz, Tony F. .

PHYSICAL REVIEW LETTERS, 2014, 113 (07)

[6]

Cohen-Tannoudji C., 1998, Atom-Photon Interactions

[7] JAYNES-CUMMINGS MODEL WITHOUT THE ROTATING-WAVE APPROXIMATION [J].

CRISP, MD .

PHYSICAL REVIEW A, 1991, 43 (05) :2430-2435

[8] Observation of the Bloch-Siegert Shift in a Qubit-Oscillator System in the Ultrastrong Coupling Regime [J].

Forn-Diaz, P. ;

Lisenfeld, J. ;

Marcos, D. ;

Garcia-Ripoll, J. J. ;

Solano, E. ;

Harmans, C. J. P. M. ;

Mooij, J. E. .

PHYSICAL REVIEW LETTERS, 2010, 105 (23)

[9] Optical dipole traps for neutral atoms [J].

Grimm, R ;

Weidemüller, M ;

Ovchinnikov, YB .

ADVANCES IN ATOMIC MOLECULAR, AND OPTICAL PHYSICS, VOL. 42, 2000, 42 :95-170

[10] Ultrafast generation of pseudo-magnetic field for valley excitons in WSe2 monolayers [J].

Kim, Jonghwan ;

Hong, Xiaoping ;

Jin, Chenhao ;

Shi, Su-Fei ;

Chang, Chih-Yuan S. ;

Chiu, Ming-Hui ;

Li, Lain-Jong ;

Wang, Feng .

SCIENCE, 2014, 346 (6214) :1205-1208

← 1 2 3 →