Real-space imaging and control of chiral anomaly induced current at room temperature in topological Dirac semimetal

Byung Cheol Park; Taewoo Ha; Kyung Ik Sim; Taek Sun Jung; Jae Hoon Kim; Yeongkwan Kim; Young Hee Lee; Teun Teun Kim; Sung Wng Kim

doi:10.1126/sciadv.abq2479

Real-space imaging and control of chiral anomaly induced current at room temperature in topological Dirac semimetal

Byung Cheol Park, Taewoo Ha, Kyung Ik Sim, Taek Sun Jung, Jae Hoon Kim, Yeongkwan Kim, Young Hee Lee, Teun Teun Kim, Sung Wng Kim

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Chiral fermions (CFs) in condensed matters, distinguished by right (+) or left (−) handedness, hold a promise for emergent quantum devices. Although a chiral anomaly induced current, J_chiral = J(+) − J(−), occurs in Weyl semimetals due to the charge imbalance of the CFs, monitoring spatial flow and temporal dynamics of J_chiral has not been demonstrated yet. Here, we report real-space imaging and control of J_chiral on the topological Dirac semimetal KZnBi at room temperature (RT) by near-field terahertz (THz) spectroscopy, establishing a relation for an electromagnetic control of J_chiral. In THz electric and external magnetic fields, we visualize a spatial flow of coherent J_chiral in macroscopic length scale and monitor its temporal dynamics in picosecond time scale, revealing its ultralong transport length around 100 micrometers. Such coherent J_chiral is further found to be controlled according to field directions, suggesting the feasibility of information science with topological Dirac semimetals at RT.

Original language	English
Article number	eabq2479
Journal	Science Advances
Volume	8
Issue number	47
DOIs	https://doi.org/10.1126/sciadv.abq2479
Publication status	Published - 2022 Nov

Bibliographical note

Funding Information:
Funding: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (Ministry of Science and ICT) (nos. 2021R1A6A1A03039696 and 2022R1A2C2004735), the Institute for Basic Science (IBS-R011-D1), and the Advanced Facility Center for Quantum Technology. B.C.P. acknowledges the support from the NRF grant funded by the Korean government (no. 2019R1A6A3A01096112).

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© 2022 American Association for the Advancement of Science. All rights reserved.

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title = "Real-space imaging and control of chiral anomaly induced current at room temperature in topological Dirac semimetal",

abstract = "Chiral fermions (CFs) in condensed matters, distinguished by right (+) or left (−) handedness, hold a promise for emergent quantum devices. Although a chiral anomaly induced current, Jchiral = J(+) − J(−), occurs in Weyl semimetals due to the charge imbalance of the CFs, monitoring spatial flow and temporal dynamics of Jchiral has not been demonstrated yet. Here, we report real-space imaging and control of Jchiral on the topological Dirac semimetal KZnBi at room temperature (RT) by near-field terahertz (THz) spectroscopy, establishing a relation for an electromagnetic control of Jchiral. In THz electric and external magnetic fields, we visualize a spatial flow of coherent Jchiral in macroscopic length scale and monitor its temporal dynamics in picosecond time scale, revealing its ultralong transport length around 100 micrometers. Such coherent Jchiral is further found to be controlled according to field directions, suggesting the feasibility of information science with topological Dirac semimetals at RT.",

author = "Park, {Byung Cheol} and Taewoo Ha and Sim, {Kyung Ik} and Jung, {Taek Sun} and Kim, {Jae Hoon} and Yeongkwan Kim and Lee, {Young Hee} and Kim, {Teun Teun} and Kim, {Sung Wng}",

note = "Funding Information: Funding: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (Ministry of Science and ICT) (nos. 2021R1A6A1A03039696 and 2022R1A2C2004735), the Institute for Basic Science (IBS-R011-D1), and the Advanced Facility Center for Quantum Technology. B.C.P. acknowledges the support from the NRF grant funded by the Korean government (no. 2019R1A6A3A01096112). Publisher Copyright: {\textcopyright} 2022 American Association for the Advancement of Science. All rights reserved.",

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doi = "10.1126/sciadv.abq2479",

language = "English",

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AU - Park, Byung Cheol

AU - Ha, Taewoo

AU - Sim, Kyung Ik

AU - Jung, Taek Sun

AU - Kim, Jae Hoon

AU - Kim, Yeongkwan

AU - Lee, Young Hee

AU - Kim, Teun Teun

AU - Kim, Sung Wng

N1 - Funding Information: Funding: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (Ministry of Science and ICT) (nos. 2021R1A6A1A03039696 and 2022R1A2C2004735), the Institute for Basic Science (IBS-R011-D1), and the Advanced Facility Center for Quantum Technology. B.C.P. acknowledges the support from the NRF grant funded by the Korean government (no. 2019R1A6A3A01096112). Publisher Copyright: © 2022 American Association for the Advancement of Science. All rights reserved.

PY - 2022/11

Y1 - 2022/11

N2 - Chiral fermions (CFs) in condensed matters, distinguished by right (+) or left (−) handedness, hold a promise for emergent quantum devices. Although a chiral anomaly induced current, Jchiral = J(+) − J(−), occurs in Weyl semimetals due to the charge imbalance of the CFs, monitoring spatial flow and temporal dynamics of Jchiral has not been demonstrated yet. Here, we report real-space imaging and control of Jchiral on the topological Dirac semimetal KZnBi at room temperature (RT) by near-field terahertz (THz) spectroscopy, establishing a relation for an electromagnetic control of Jchiral. In THz electric and external magnetic fields, we visualize a spatial flow of coherent Jchiral in macroscopic length scale and monitor its temporal dynamics in picosecond time scale, revealing its ultralong transport length around 100 micrometers. Such coherent Jchiral is further found to be controlled according to field directions, suggesting the feasibility of information science with topological Dirac semimetals at RT.

AB - Chiral fermions (CFs) in condensed matters, distinguished by right (+) or left (−) handedness, hold a promise for emergent quantum devices. Although a chiral anomaly induced current, Jchiral = J(+) − J(−), occurs in Weyl semimetals due to the charge imbalance of the CFs, monitoring spatial flow and temporal dynamics of Jchiral has not been demonstrated yet. Here, we report real-space imaging and control of Jchiral on the topological Dirac semimetal KZnBi at room temperature (RT) by near-field terahertz (THz) spectroscopy, establishing a relation for an electromagnetic control of Jchiral. In THz electric and external magnetic fields, we visualize a spatial flow of coherent Jchiral in macroscopic length scale and monitor its temporal dynamics in picosecond time scale, revealing its ultralong transport length around 100 micrometers. Such coherent Jchiral is further found to be controlled according to field directions, suggesting the feasibility of information science with topological Dirac semimetals at RT.

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Real-space imaging and control of chiral anomaly induced current at room temperature in topological Dirac semimetal

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