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Content of SPECIAL TOPIC—Topological 2D materials in our journal
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Evidence for topological superconductivity: Topological edge states in Bi
2
Te
3
/FeTe heterostructure
Bin Guo(郭斌), Kai-Ge Shi(师凯歌), Hai-Lang Qin(秦海浪), Liang Zhou(周良), Wei-Qiang Chen(陈伟强), Fei Ye(叶飞), Jia-Wei Mei(梅佳伟), Hong-Tao He(何洪涛), Tian-Luo Pan(潘天洛), Gan Wang(王干)
Chin. Phys. B, 2020, 29 (
9
): 097403. DOI:
10.1088/1674-1056/abaf9c
Abstract
(
694
)
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(3384KB)(
250
)
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Majorana fermions have been predicted to exist at the edge states of a two-dimensional topological superconductor. We fabricated single quintuple layer (QL) Bi
2
Te
3
/FeTe heterostructure with the step-flow epitaxy method and studied the topological properties of this system by using angle-resolved photoemission spectroscopy and scanning tunneling microscopy/spectroscopy. We observed the coexistence of robust superconductivity and edge states on the single QL Bi
2
Te
3
islands which can be potential evidence for topological superconductor.
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Effect of graphene grain boundaries on MoS
2
/graphene heterostructures
Yue Zhang(张悦), Xiangzhe Zhang(张祥喆), Chuyun Deng(邓楚芸), Qi Ge(葛奇), Junjie Huang(黄俊杰), Jie Lu(卢捷), Gaoxiang Lin(林高翔), Zekai Weng(翁泽锴), Xueao Zhang(张学骜), Weiwei Cai(蔡伟伟)
Chin. Phys. B, 2020, 29 (
6
): 067403. DOI:
10.1088/1674-1056/ab8a37
Abstract
(
690
)
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(2405KB)(
215
)
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The grain boundaries of graphene are disordered topological defects, which would strongly affect the physical and chemical properties of graphene. In this paper, the spectral characteristics and photoresponse of MoS
2
/graphene heterostructures are studied. It is found that the blueshift of the G and 2D peaks of graphene in Raman spectrum is due to doping. The lattice mismatch at the graphene boundaries results in a blueshift of MoS
2
features in the photoluminescence spectra, comparing to the MoS
2
grown on SiO
2
. In addition, the photocurrent signal in MoS
2
/hexagonal single-crystal graphene heterostructures is successfully captured without bias, but not in MoS
2
/polycrystalline graphene heterostructures. The electron scattering at graphene grain boundaries affects the optical response of MoS
2
/graphene heterostructures. The photoresponse of the device is attributed to the optical absorption and response of MoS
2
and the high carrier mobility of graphene. These findings offer a new approach to develop optoelectronic devices based on two-dimensional material heterostructures.
Select
Acoustic plasmonics of Au grating/Bi
2
Se
3
thin film/sapphirehybrid structures
Weiwu Li(李伟武), Konstantin Riegel, Chuanpu Liu(刘传普), Alexey Taskin, Yoichi Ando, Zhimin Liao(廖志敏), Martin Dressel, Yuan Yan(严缘)
Chin. Phys. B, 2020, 29 (
6
): 067801. DOI:
10.1088/1674-1056/ab8a3c
Abstract
(
486
)
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140
)
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The surface plasmon polaritons of the topological insulator Bi
2
Se
3
can be excited by using etched grating or grave structures to compensate the wave vector mismatch of the incident photon and plasmon. Here, we demonstrate novel gold grating/Bi
2
Se
3
thin film/sapphire hybrid structures, which allow the excitation of surface plasmon polaritons propagating through nondestructive Bi
2
Se
3
thin film with the help of gold diffractive gratings. Utilizing periodic Au surface structures, the momentum can be matched and the normal-incidence infrared reflectance spectra exhibit pronounced dips. When the width of the gold grating
W
(with a periodicity 2
W
) increases from 400 nm to 1500 nm, the resonant frequencies are tuned from about 7000 cm
-1
to 2500 cm
-1
. In contrast to the expected √
q
dispersion for both massive and massless fermions, where
q
~
π/W
is the wave vector, we observe a sound-like linear dispersion even at room temperature. This surface plasmon polaritons with linear dispersion are attributed to the unique noninvasive fabrication method and high mobility of topological surface electrons. This novel structure provides a promising application of Dirac plasmonics.
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Topological Anderson insulator in two-dimensional non-Hermitian systems
Hongfang Liu(刘宏芳), Zixian Su(苏子贤), Zhi-Qiang Zhang(张智强), Hua Jiang(江华)
Chin. Phys. B, 2020, 29 (
5
): 050502. DOI:
10.1088/1674-1056/ab8201
Abstract
(
1023
)
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384
)
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We study the disorder-induced phase transition in two-dimensional non-Hermitian systems. First, the applicability of the noncommutative geometric method (NGM) in non-Hermitian systems is examined. By calculating the Chern number of two different systems (a square sample and a cylindrical one), the numerical results calculated by NGM are compared with the analytical one, and the phase boundary obtained by NGM is found to be in good agreement with the theoretical prediction. Then, we use NGM to investigate the evolution of the Chern number in non-Hermitian samples with the disorder effect. For the square sample, the stability of the non-Hermitian Chern insulator under disorder is confirmed. Significantly, we obtain a nontrivial topological phase induced by disorder. This phase is understood as the topological Anderson insulator in non-Hermitian systems. Finally, the disordered phase transition in the cylindrical sample is also investigated. The clean non-Hermitian cylindrical sample has three phases, and such samples show more phase transitions by varying the disorder strength: (1) the normal insulator phase to the gapless phase, (2) the normal insulator phase to the topological Anderson insulator phase, and (3) the gapless phase to the topological Anderson insulator phase.
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Magnetic field enhanced single particle tunneling in MoS
2
-superconductor vertical Josephson junction
Wen-Zheng Xu(徐文正), Lai-Xiang Qin(秦来香), Xing-Guo Ye(叶兴国), Fang Lin(林芳), Da-Peng Yu(俞大鹏), Zhi-Min Liao(廖志敏)
Chin. Phys. B, 2020, 29 (
5
): 057502. DOI:
10.1088/1674-1056/ab8209
Abstract
(
678
)
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225
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As a prototypical transition-metal dichalcogenide semiconductor, MoS
2
possesses strong spin-orbit coupling, which provides an ideal platform for the realization of interesting physical phenomena. Here, we report the magnetotransport properties in NbN-MoS
2
-NbN sandwich junctions at low temperatures. Above the critical temperature around ~11 K, the junction resistance shows weak temperature dependence, indicating a tunneling behavior. While below ~11 K, nearly zero junction resistance is observed, indicating the superconducting state in the MoS
2
layer induced by the superconducting proximity effect. When a perpendicular magnetic field ~1 T is applied, such proximity effect is suppressed, accompanying with insulator-like temperature-dependence of the junction resistance. Intriguingly, when further increasing the magnetic field, the junction conductance is significantly enhanced, which is related to the enhanced single particle tunneling induced by the decrease of the superconducting energy gap with increasing magnetic fields. In addition, the possible Majorana zero mode on the surface of MoS
2
can further lead to the enhancement of the junction conductance.
ISSN 1674-1056 CN 11-5639/O4
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