CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Prev
Next
|
|
|
Majorana tunneling in a one-dimensional wire with non-Hermitian double quantum dots |
Peng-Bin Niu(牛鹏斌)1,† and Hong-Gang Luo(罗洪刚)2,3 |
1 Institute of Solid State Physics, Shanxi Datong University, and Shanxi Provincial Key Laboratory of Microstructural Electromagnetic Functional Materials, Datong 037009, China; 2 School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China; 3 Beijing Computational Science Research Center, Beijing 100084, China |
|
|
Abstract The combination of non-Hermitian physics and Majorana fermions can give rise to new effects in quantum transport systems. In this work, we investigate the interplay of PT-symmetric complex potentials, Majorana tunneling and interdot tunneling in a non-Hermitian double quantum dots system. It is found that in the weak-coupling regime the Majorana tunneling has pronounced effects on the transport properties of such a system, manifested as splitting of the single peak into three and a reduced 1/4 peak in the transmission function. In the presence of the PT-symmetric complex potentials and interdot tunneling, the 1/4 central peak is robust against them, while the two side peaks are tuned by them. The interdot tunneling only induces asymmetry, instead of moving the conductance peak, due to the robustness of the Majorana modes. There is an exceptional point induced by the union of Majorana tunneling and interdot tunneling. With increased PT-symmetric complex potentials, the two side peaks will move towards each other. When the exceptional point is passed through, these two side peaks will disappear. In the strong-coupling regime, the Majorana fermion induces a 1/4 conductance dip instead of the three-peak structure. PT-symmetric complex potentials induce two conductance dips pinned at the exceptional point. These effects should be accessible in experiments.
|
Received: 07 July 2023
Revised: 06 October 2023
Accepted manuscript online: 09 October 2023
|
PACS:
|
74.25.F-
|
(Transport properties)
|
|
73.21.La
|
(Quantum dots)
|
|
81.07.Gf
|
(Nanowires)
|
|
73.23.-b
|
(Electronic transport in mesoscopic systems)
|
|
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11834005). |
Corresponding Authors:
Peng-Bin Niu
E-mail: niupengbin@163.com
|
Cite this article:
Peng-Bin Niu(牛鹏斌) and Hong-Gang Luo(罗洪刚) Majorana tunneling in a one-dimensional wire with non-Hermitian double quantum dots 2024 Chin. Phys. B 33 017403
|
[1] Bender C M and Boettcher S 1998 Phys. Rev. Lett. 80 5243 [2] Bender C M, et al. 2002 Phys. Rev. Lett. 89 270401 [3] Bender C M 2007 Rep. Prog. Phys. 70 947 [4] El-Ganainy R, et al. 2018 Nat. Phys. 14 11 [5] Muller M and Rotter I 2008 J. Phys. A:Math. Theor. 41 244018 [6] Moiseyev N 2011 Non-Hermitian Quantum Mechanics (Cambridge:Cambridge University Press) [7] Ernzerhof M, et al. 2020 J. Chem. Phys. 152 244119 [8] Rotter I 2009 J. Phys. A:Math. Theor. 42 153001 [9] Malzard S, et al. 2015 Phys. Rev. Lett. 115 200402 [10] Ozdemir S K, et al. 2019 Nat. Mater. 18 783 [11] Miri M A and Alu A 2019 Science 363 eaar7709 [12] Pikulin D I and Nazarov Y V 2013 Phys. Rev. B 87 235421 [13] Hyart T and Lado J L 2022 Phys. Rev. Research 4 L012006 [14] Leijnse M and Flensberg K 2012 Phys. Rev. B 86 134528 [15] Gong W J, et al. 2014 Phys. Rev. B 89 245413 [16] Sherman D, et al. 2017 Nat. Nanotechnol. 12 212 [17] Rancic M J, et al. 2019 Phys. Rev. B 99 165306 [18] Cifuentes J D and Dias da Silva L G G V 2019 Phys. Rev. B 100 085429 [19] Weymann I, et al. 2020 Phys. Rev. B 101 235404 [20] Sanches J E, et al. 2020 Phys. Rev. B 102 075128 [21] Majek P and Weymann I 2021 Phys. Rev. B 104 085416 [22] Yang F B 2021 Phys. Lett. A 401 127350 [23] Majek P, et al. 2022 Phys. Rev. B 106 155123 [24] Majek P, et al. 2022 Phys. Rev. B 105 075418 [25] Majek P and Weymann I 2022 J. Mag. Mag. Mat. 549 168935 [26] Deng M X, et al. 2015 Chin. Phys. B 24 037302 [27] Chen L, et al. 2018 Chin. Phys. B 27 077102 [28] Albrecht S M, et al. 2016 Nature 531 206 [29] Weymann I 2017 J. Phys.:Condens. Matter 29 095301 [30] Majek P, et al. 2022 Phys. Rev. B 105 075418 [31] Zhang L L and Gong W J 2017 Phys. Rev. A 95 062123 [32] Zhang L L, et al. 2018 Superlatt. Microstruct. 113 558 [33] Flensberg K 2010 Phys. Rev. B 82 180516 [34] Liu D E and Baranger H U 2011 Phys. Rev. B 84 201308 [35] Niu P B, et al. 2023 Physica B 663 414974 [36] Zhang L L, et al. 2019 Phys. Rev. A 99 032119 [37] Mourik V, et al. 2012 Science 336 1003 [38] Flensberg K, von Oppen F and Stern A 2021 Nature Rev. Mater. 6 944 [39] Meir Y and Wingreen N S 1992 Phys. Rev. Lett. 68 2512 [40] Sun Q F, Guo H 2002 Phys. Rev. B 66 155308 [41] Tolea M and Bulka B R 2007 Phys. Rev. B 75 125301 [42] Liu Y, et al. 2006 Phys. Lett. A 360 154 [43] Alvarez C, et al. 2015 Phys. Lett. A 379 1062 [44] Haug H J W, Jauho A P 2008 Quantum Kinetics in Transport and Optics of Semiconductors (Berlin:Springer) [45] Niu P B and Luo H G 2021 Acta Phys. Sin. 70 117401 (in Chinese) |
No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
Altmetric
|
blogs
Facebook pages
Wikipedia page
Google+ users
|
Online attention
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
View more on Altmetrics
|
|
|