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Zhu L, Liu X, Li L, Wan X, Tao R, Xie Z, Feng J, Zeng C. Signature of quantum interference effect in inter-layer Coulomb drag in graphene-based electronic double-layer systems. Nat Commun 2023; 14:1465. [PMID: 36927844 PMCID: PMC10020572 DOI: 10.1038/s41467-023-37197-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Accepted: 03/03/2023] [Indexed: 03/18/2023] Open
Abstract
The distinguishing feature of a quantum system is interference arising from the wave mechanical nature of particles which is clearly central to macroscopic electronic properties. Here, we report the signature of quantum interference effect in inter-layer transport process. Via systematic magneto-drag experiments on graphene-based electronic double-layer systems, we observe low-field correction to the Coulomb-scattering-dominated inter-layer drag resistance in a wide range of temperature and carrier density, with its characteristics sensitive to the band topology of graphene layers. These observations can be attributed to a new type of quantum interference between drag processes, with the interference pathway comprising different carrier diffusion paths in the two constituent conductors. The emergence of such effect relies on the formation of superimposing planar diffusion paths, among which the impurity potentials from intermediate insulating spacer play an essential role. Our findings establish an ideal platform where the interplay between quantum interference and many-body interaction is essential.
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Affiliation(s)
- Lijun Zhu
- CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China, Hefei, 230026, China.,International Center for Quantum Design of Functional Materials (ICQD), Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Xiaoqiang Liu
- International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China
| | - Lin Li
- CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China, Hefei, 230026, China. .,International Center for Quantum Design of Functional Materials (ICQD), Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China. .,Hefei National Laboratory, Hefei, 230088, China.
| | - Xinyi Wan
- CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China, Hefei, 230026, China.,International Center for Quantum Design of Functional Materials (ICQD), Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Ran Tao
- CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China, Hefei, 230026, China.,International Center for Quantum Design of Functional Materials (ICQD), Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Zhongniu Xie
- CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China, Hefei, 230026, China.,International Center for Quantum Design of Functional Materials (ICQD), Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China
| | - Ji Feng
- International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China. .,Hefei National Laboratory, Hefei, 230088, China.
| | - Changgan Zeng
- CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China, Hefei, 230026, China. .,International Center for Quantum Design of Functional Materials (ICQD), Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China. .,Hefei National Laboratory, Hefei, 230088, China.
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2
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Romano P, Polcari A, Cirillo C, Attanasio C. Drag Voltages in a Superconductor/Insulator/Ferromagnet Trilayer. MATERIALS (BASEL, SWITZERLAND) 2021; 14:7575. [PMID: 34947170 PMCID: PMC8706857 DOI: 10.3390/ma14247575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 11/26/2021] [Accepted: 12/06/2021] [Indexed: 11/25/2022]
Abstract
The interaction between two spatially separated systems is of strong interest in order to study a wide class of unconventional effects at cryogenic temperatures. Here we report on drag transverse voltage effects in multilayered systems containing superconducting and ferromagnetic materials. The sample under test is a conventional superconductor/insulator/ferromagnet (S/I/F) trilayer in a cross configuration. S/F as well as S/N (here N stands for normal metal) bilayers in the same geometry are also analyzed for comparison. Current-voltage (I-V) characteristics measured at T = 4.2 K in the presence of a perpendicular magnetic field show strong peculiarities related to the interaction between the layers. The results are interpreted in terms of interaction effects between the layers.
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Affiliation(s)
- Paola Romano
- Science and Technology Department, University of Sannio, I-82100 Benevento, Italy;
- CNR-SPIN, c/o University of Salerno, I-84084 Fisciano, Italy; (C.C.); (C.A.)
| | - Albino Polcari
- Science and Technology Department, University of Sannio, I-82100 Benevento, Italy;
- Liceo Statale “F. De Sanctis”, I-84133 Salerno, Italy
| | - Carla Cirillo
- CNR-SPIN, c/o University of Salerno, I-84084 Fisciano, Italy; (C.C.); (C.A.)
- Physics Department “E.R. Caianiello”, University of Salerno, I-84084 Fisciano, Italy
| | - Carmine Attanasio
- CNR-SPIN, c/o University of Salerno, I-84084 Fisciano, Italy; (C.C.); (C.A.)
- Physics Department “E.R. Caianiello”, University of Salerno, I-84084 Fisciano, Italy
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3
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Doan MH, Jin Y, Chau TK, Joo MK, Lee YH. Room-Temperature Mesoscopic Fluctuations and Coulomb Drag in Multilayer WSe 2. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1900154. [PMID: 30883934 DOI: 10.1002/adma.201900154] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Revised: 02/23/2019] [Indexed: 06/09/2023]
Abstract
Mesoscopic fluctuations, manifesting the quantum interference (QI) of electrons, have been theoretically proposed in bilayer Coulomb drag systems. Unfortunately, these phenomena are usually observed at cryogenic temperatures, which severely limits their novel physics for pragmatic applications. In this paper, observation of room-temperature QI and Coulomb drag in a multilayer WSe2 transistor is reported via graphene contacts separately at its top and bottom layers. The central layers of WSe2 act as an insulating region with a width of few nanometers, which spatially separates the top and bottom conducting channels and provides a strong Coulomb interaction between them, leading to large conductance oscillations at room temperature. The gradual suppression of the oscillations with the increase in the applied magnetic field and/or injected current further confirms the QI phenomenon. With the decrease in temperature, the Coulomb drag effect is exhibited in the system owing to the increased thickness of the insulating region. This study reveals a novel approach for realization of advanced quantum electronics operating at high temperatures.
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Affiliation(s)
- Manh-Ha Doan
- Department of Energy Science, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Youngjo Jin
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Suwon, 16419, Republic of Korea
| | - Tuan Khanh Chau
- Department of Energy Science, Sungkyunkwan University, Suwon, 16419, Republic of Korea
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Suwon, 16419, Republic of Korea
| | - Min-Kyu Joo
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Suwon, 16419, Republic of Korea
- Department of Applied Physics, Sookmyung Women's University, Seoul, 04310, Republic of Korea
| | - Young Hee Lee
- Department of Energy Science, Sungkyunkwan University, Suwon, 16419, Republic of Korea
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Suwon, 16419, Republic of Korea
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4
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Park J, Song S, Yang Y, Kwon SH, Sim E, Kim YS. Identification of Droplet-Flow-Induced Electric Energy on Electrolyte–Insulator–Semiconductor Structure. J Am Chem Soc 2017; 139:10968-10971. [DOI: 10.1021/jacs.7b05030] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Junwoo Park
- Program
in Nano Science and Technology, Graduate School of Convergence Science
and Technology, Seoul National University, Seoul 08826, Korea
| | - Suhwan Song
- Department
of Chemistry, Yonsei University, 50, Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
| | - YoungJun Yang
- Program
in Nano Science and Technology, Graduate School of Convergence Science
and Technology, Seoul National University, Seoul 08826, Korea
| | - Soon-Hyung Kwon
- Program
in Nano Science and Technology, Graduate School of Convergence Science
and Technology, Seoul National University, Seoul 08826, Korea
- Display
Materials and Components Research Center, Korea Electronics Technology Institute, Seongnam 13509, Korea
| | - Eunji Sim
- Department
of Chemistry, Yonsei University, 50, Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
| | - Youn Sang Kim
- Program
in Nano Science and Technology, Graduate School of Convergence Science
and Technology, Seoul National University, Seoul 08826, Korea
- Advanced Institutes of Convergence Technology, 864-1 Iui-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do 16229, Korea
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5
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O'Farrell ECT, Avsar A, Tan JY, Eda G, Özyilmaz B. Quantum Transport Detected by Strong Proximity Interaction at a Graphene-WS2 van der Waals Interface. NANO LETTERS 2015; 15:5682-5688. [PMID: 26258760 DOI: 10.1021/acs.nanolett.5b01128] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Magnetotransport measurements demonstrate that graphene in a van der Waals heterostructure is a sensitive probe of quantum transport in an adjacent WS2 layer via strong Coulomb interactions. We observe a large low-field magnetoresistance (≫ e(2)/h) and a -ln T temperature dependence of the resistance. In-plane magnetic field resistance indicates the origin is orbital and nonclassical. We demonstrate a strong electron-hole asymmetry in the mobility and coherence length of graphene demonstrating the presence of localized Coulomb interactions with ionized donors in the WS2 substrate, which ultimately leads to screening as the Fermi level of graphene is tuned toward the conduction band of WS2. This leads us to conclude that graphene couples to quantum localization processes in WS2 via the Coulomb interaction and results in the observed signatures of quantum transport. Our results show that theoretical descriptions of the van der Waals interface should not ignore localized strong correlations.
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Affiliation(s)
- E C T O'Farrell
- Centre for Advanced 2D Materials, National University of Singapore , Singapore 117546, Singapore
| | - A Avsar
- Centre for Advanced 2D Materials, National University of Singapore , Singapore 117546, Singapore
| | - J Y Tan
- Centre for Advanced 2D Materials, National University of Singapore , Singapore 117546, Singapore
| | - G Eda
- Centre for Advanced 2D Materials, National University of Singapore , Singapore 117546, Singapore
| | - B Özyilmaz
- Centre for Advanced 2D Materials, National University of Singapore , Singapore 117546, Singapore
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6
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Jiang QD, Bao ZQ, Sun QF, Xie XC. Theory for electric dipole superconductivity with an application for bilayer excitons. Sci Rep 2015; 5:11925. [PMID: 26154838 PMCID: PMC4495569 DOI: 10.1038/srep11925] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Accepted: 06/09/2015] [Indexed: 12/01/2022] Open
Abstract
Exciton superfluid is a macroscopic quantum phenomenon in which large quantities of excitons undergo the Bose-Einstein condensation. Recently, exciton superfluid has been widely studied in various bilayer systems. However, experimental measurements only provide indirect evidence for the existence of exciton superfluid. In this article, by viewing the exciton in a bilayer system as an electric dipole, we derive the London-type and Ginzburg-Landau-type equations for the electric dipole superconductors. By using these equations, we discover the Meissner-type effect and the electric dipole current Josephson effect. These effects can provide direct evidence for the formation of the exciton superfluid state in bilayer systems and pave new ways to drive an electric dipole current.
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Affiliation(s)
- Qing-Dong Jiang
- International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, P.R. China
| | - Zhi-qiang Bao
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P.R. China
| | - Qing-Feng Sun
- 1] International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, P.R. China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100871, P.R. China
| | - X C Xie
- 1] International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, P.R. China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100871, P.R. China
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7
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Park J, Yang Y, Kwon SH, Kim YS. Influences of Surface and Ionic Properties on Electricity Generation of an Active Transducer Driven by Water Motion. J Phys Chem Lett 2015; 6:745-9. [PMID: 26262497 DOI: 10.1021/jz502613s] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
In this Letter, we discuss the surface, ionic properties, and scale-up potential of an active transducer that generated electricity from natural water motion. When a liquid contacts a solid surface, an electrical double layer (EDL) is always formed at the solid/liquid interface. By modulating the EDL, the active transducer could generate a peak voltage of ∼3 V and a peak power of ∼5 μW. Interestingly, there were specific salinities of solution droplets that showed maximum performance and different characteristics according to the ions' nature. Analyzing the results macroscopically, we tried to figure out the origins of the active transducing precipitated by ions dynamics. Also, we demonstrated the scale-up potential for practical usage by multiple electrode design.
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Affiliation(s)
- Junwoo Park
- †Program in Nano Science and Technology, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151-744, Republic of Korea
| | - YoungJun Yang
- †Program in Nano Science and Technology, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151-744, Republic of Korea
| | - Soon-Hyung Kwon
- †Program in Nano Science and Technology, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151-744, Republic of Korea
- ‡Flexible Display Research Center, Korea Electronics Technology Institute, Seongnam, Gyeonggi-do 463-816, Republic of Korea
| | - Youn Sang Kim
- †Program in Nano Science and Technology, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151-744, Republic of Korea
- §Advanced Institutes of Convergence Technology, 864-1 Iui-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-270, Republic of Korea
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8
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Anomalous low-temperature Coulomb drag in graphene-GaAs heterostructures. Nat Commun 2014; 5:5824. [DOI: 10.1038/ncomms6824] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Accepted: 11/10/2014] [Indexed: 11/08/2022] Open
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9
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Yin J, Li X, Yu J, Zhang Z, Zhou J, Guo W. Generating electricity by moving a droplet of ionic liquid along graphene. NATURE NANOTECHNOLOGY 2014; 9:378-83. [PMID: 24705513 DOI: 10.1038/nnano.2014.56] [Citation(s) in RCA: 194] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 02/19/2014] [Indexed: 05/24/2023]
Abstract
Since the early nineteenth century, it has been known that an electric potential can be generated by driving an ionic liquid through fine channels or holes under a pressure gradient. More recently, it has been reported that carbon nanotubes can generate a voltage when immersed in flowing liquids, but the exact origin of these observations is unclear, and generating electricity without a pressure gradient remains a challenge. Here, we show that a voltage of a few millivolts can be produced by moving a droplet of sea water or ionic solution over a strip of monolayer graphene under ambient conditions. Through experiments and density functional theory calculations, we find that a pseudocapacitor is formed at the droplet/graphene interface, which is driven forward by the moving droplet, charging and discharging at the front and rear of the droplet. This gives rise to an electric potential that is proportional to the velocity and number of droplets. The potential is also found to be dependent on the concentration and ionic species of the droplet, and decreases sharply with an increasing number of graphene layers. We illustrate the potential of this electrokinetic phenomenon by using it to create a handwriting sensor and an energy-harvesting device.
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Affiliation(s)
- Jun Yin
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education, and Institute of Nanoscience, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China
| | - Xuemei Li
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education, and Institute of Nanoscience, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China
| | - Jin Yu
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education, and Institute of Nanoscience, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China
| | - Zhuhua Zhang
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education, and Institute of Nanoscience, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China
| | - Jianxin Zhou
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education, and Institute of Nanoscience, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China
| | - Wanlin Guo
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education, and Institute of Nanoscience, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China
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10
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Schütt M, Ostrovsky PM, Titov M, Gornyi IV, Narozhny BN, Mirlin AD. Coulomb drag in graphene near the Dirac point. PHYSICAL REVIEW LETTERS 2013; 110:026601. [PMID: 23383926 DOI: 10.1103/physrevlett.110.026601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Indexed: 06/01/2023]
Abstract
We study Coulomb drag in graphene near the Dirac point, focusing on the regime of interaction-dominated transport. We establish a novel, graphene-specific mechanism of Coulomb drag based on fast interlayer thermalization, inaccessible by standard perturbative approaches. Using the quantum kinetic equation framework, we derive a hydrodynamic description of transport in double-layer graphene in terms of electric and energy currents. In the clean limit the drag becomes temperature independent. In the presence of disorder the drag coefficient at the Dirac point remains nonzero due to higher-order scattering processes and interlayer disorder correlations. At low temperatures (diffusive regime) these contributions manifest themselves in the peak in the drag coefficient centered at the neutrality point with a magnitude that grows with lowering temperature.
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Affiliation(s)
- M Schütt
- Institut für Nanotechnologie, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
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11
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Tikhonenko FV, Kozikov AA, Savchenko AK, Gorbachev RV. Transition between electron localization and antilocalization in graphene. PHYSICAL REVIEW LETTERS 2009; 103:226801. [PMID: 20366117 DOI: 10.1103/physrevlett.103.226801] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2009] [Indexed: 05/29/2023]
Abstract
We show that quantum interference in graphene can result in antilocalization of charge carriers--an increase of the conductance, which is detected by a negative magnetoconductance. We demonstrate that depending on experimental conditions one can observe either weak localization or antilocalization of carriers in graphene. A transition from localization to antilocalization occurs when the carrier density is decreased and the temperature is increased. We show that quantum interference in graphene can survive at high temperatures, up to T approximately 200 K, due to weak electron-phonon scattering.
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Affiliation(s)
- F V Tikhonenko
- School of Physics, University of Exeter, EX4 4QL Exeter, United Kingdom
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12
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Seamons JA, Morath CP, Reno JL, Lilly MP. Coulomb drag in the exciton regime in electron-hole bilayers. PHYSICAL REVIEW LETTERS 2009; 102:026804. [PMID: 19257304 DOI: 10.1103/physrevlett.102.026804] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2008] [Indexed: 05/27/2023]
Abstract
Electron-hole bilayers are expected to make a transition from a pair of weakly coupled two-dimensional systems to a strongly coupled exciton system as the barrier between the layers is reduced. Coulomb drag measurements on devices with a 30 nm barrier are consistent with two weakly coupled 2D Fermi systems where the drag decreases with temperature. For a 20 nm barrier, however, we observe an increase in the drag resistance as the temperature is reduced when a current is driven in the electron layer and voltage measured in the hole layer. These results indicate the onset of strong coupling possibly due to exciton formation or phenomena related to exciton condensation.
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Affiliation(s)
- J A Seamons
- Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
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13
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Levchenko A, Kamenev A. Coulomb drag in quantum circuits. PHYSICAL REVIEW LETTERS 2008; 101:216806. [PMID: 19113440 DOI: 10.1103/physrevlett.101.216806] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2008] [Indexed: 05/27/2023]
Abstract
We study the drag effect in a system of two electrically isolated quantum point contacts, coupled by Coulomb interactions. Drag current exhibits maxima as a function of quantum point contacts gate voltages when the latter are tuned to the transitions between quantized conductance plateaus. In the linear regime this behavior is due to enhanced electron-hole asymmetry near an opening of a new conductance channel. In the nonlinear regime the drag current is proportional to the shot noise of the driving circuit, suggesting that the Coulomb drag experiments may be a convenient way to measure the quantum shot noise. Remarkably, the transition to the nonlinear regime may occur at driving voltages substantially smaller than the temperature.
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Affiliation(s)
- Alex Levchenko
- Department of Physics, University of Minnesota, Minneapolis, Minnesota 55455, USA
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14
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Levchenko A, Kamenev A. Coulomb drag at zero temperature. PHYSICAL REVIEW LETTERS 2008; 100:026805. [PMID: 18232906 DOI: 10.1103/physrevlett.100.026805] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2007] [Indexed: 05/25/2023]
Abstract
We show that the Coulomb drag effect exhibits saturation at small temperatures, when calculated to the third order in the interlayer interactions. The zero-temperature transresistance is of the order h/(e2g3), where g is the dimensionless sheet conductance. The effect is therefore the strongest in low mobility samples. This behavior should be contrasted with the conventional (second order) prediction that the transresistance scales as a certain power of temperature and is (almost) mobility independent. The result demonstrates that the zero-temperature drag is not an unambiguous signature of a strongly coupled state in double-layer systems.
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Affiliation(s)
- Alex Levchenko
- Department of Physics, University of Minnesota, Minneapolis, Minnesota 55455, USA
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15
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Lerner IV. So Small Yet Still Giant. Science 2007; 316:63-4. [PMID: 17412946 DOI: 10.1126/science.1141972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Igor V Lerner
- School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK.
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