Faculty Profiles - JÄCK Berthold | The Hong Kong University of Science and Technology

Berthold JÄCK
澤柏澔

PhD in Physics
Swiss Federal Institute of Technology, Lausanne (EPFL), 2015

Assistant Professor
Department of Physics

Google Scholar

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ORCID

0000-0003-3826-0855

Scopus ID

56442207500

Research Interest

Condensed matter physics
Microscopy
Topological phases and topological materials
Strongly correlated materials
Disordered materials

Publications

2024 1

Experimental Evidence for a Berry Curvature Quadrupole in an Antiferromagnet

Physical Review X, v. 14, (2), June 2024, article number 021046
Sankar, Soumya; Liu, Ruizi; Zhang, Chengping; Li, Qi-fang; Chen, Caiyun; Gao, Xuejian; Zheng, Jiangchang; Lin, Yi-hsin; Qian, Kun; Yu, Ruo-Peng; Zhang, Xu; Meng, Zi Yang; Law, Kam Tuen; Shao, Qiming; Jaeck, Berthold
Article

2023 3

Grain size in low loss superconducting Ta thin films on c axis sapphire

Journal of Applied Physics, v. 134, (14), October 2023, article number 144402
Jones, Sarah Garcia; Materise, Nicholas; Leung, Ka Wun Casey; Weber, Joel C.; Isakov, Brian D.; Chen, Xi; Zheng, Jiangchang; Gyenis, András; Jaeck, Berthold; McRae, Corey Rae H.
Article

Visualizing the localized electrons of a kagome flat band

Physical Review Research, v. 5, (4), October 2023 , article number 043269
Chen, Caiyun; Zheng, Jiangchang; Yu, Ruopeng; Sankar, Soumya; Law, Kam Tuen; Po, Hoi Chun; Jaeck, Berthold
Article

Mapping out the topological phase diagram of FeSn

Sankar, Soumya; Liu, Ruizi; Zhang, Chengping; Li, Qifang; Qian, Kun; Zheng, Jiangchang; Chen, Caiyun; Meng, Zi Yang; Law, Kam Tuen; Shao, Qiming; Jaeck, Berthold
Conference paper

2022 2

Evidence for a monolayer excitonic insulator

Nature Physics, v. 18, (1), January 2022, p. 87-93
Jia, Yanyu; Wang, Pengjie; Chiu, Chen-Li; Song, Zhida; Yu, Guo; Jaeck, Berthold; Lei, Shiming; Klemenz, Sebastian; Cevallos, Alexandre F.; Onyszczak, Michael; Fishchenko, Nadezhda; Liu, Xiaomeng; Farahi, Gelareh; Xie, Fang; Xu, Yuanfeng; Watanabe, Kenji; Taniguchi, Takeshi; Bernevig, B. Andrei; Cava, Robert J.; Schoop, Leslie M.; Yazdani, Ali; Wu, Sanfeng
Article

Evidence for isotropic s-wave superconductivity in high-entropy alloys

Scientific Reports, v. 12, (1), July 2022, article number 12773
Leung, Ka Wun Casey; Zhang, Xiaofu; von Rohr, Fabian; Lortz, Rolf Walter; Jaeck, Berthold
Article

2021 5

Detecting And Distinguishing Majorana Zero Modes With The Scanning Tunnelling Microscope

Nature Reviews Physics, v. 3, (8), August 2021, p. 541-554
Jaeck, Berthold; Xie, Yonglong; Yazdani, Ali
Article

Microscopic relaxation channels in materials for superconducting qubits

Communications Materials, v. 2, (1), July 2021, article number 72
Premkumar, Anjali; Weiland, Conan; Hwang, Sooyeon; Jaeck, Berthold; Place, Alexander P.M.; Waluyo, Iradwikanari; Hunt, Adrian; Bisogni, Valentina; Pellicari, Jonathan; Barbour, Andi; Miller, Mike S.; Russo, Paola; Camino, Fernando; Kisslinger, Kim; Tong, Xiao; Hybertsen, Mark. S.; Houck, Andrew A.; Jarrige, Ignacio
Article

New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds

Nature Communications, v. 12, March 2021, article number 1779
Place, Alexander P.M.; Rpdgers, Lila V.H.; Mundada, Pranav; Smitham, Basil M.; Fitzpatrick, Mattias; Leng, Zhaoqi; Premkumar, Anjali; Bryon, Jacob; Vrajitorea, Andrei; Sussman, Sara; Cheng, Guangming; Madhavan, Trisha; Babla, Harshvardhan K.; Le, Xuan Hoang; Gang, Youqi; Jaeck, Berthold; Gyenis, Andras; Yao, Nan; Cava, Robert J.; De leon, Nathalie P.; Houck, Andrew A.
Article

Visualizing the multifractal wave functions of a disordered two-dimensional electron gas

Physical Review Research, v. 3, (1), Janaury-March 2021, article number 013022
Jaeck, Berthold; Zinser, Fabian; Konig, Elio J.; Wissing, Sune N.P.; Schmidt, Anke B.; Donath, Markus; Kern, Klaus; Ast, Christine R.
Article

New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds

Place, Alexander; Rodgers, Lila; Dutta, Aveek; Mundada, Pranav; Smitham, Basil; Fitzpatrick, Mattias V.; Leng, Zhaoqi; Premkumar, Anjali; Bryon, Jacob Elvin; Sussman, Sara; Cheng, Guangming; Madhavan, Trisha N.; Babla, Harshvardhan; Jaeck, Berthold; Gyenis, Andras; Yao, Nan; Cava, Robert; De Leon, Nathalie; Houck, Andrew
Conference paper

2020 2

Observation of backscattering induced by magnetism in a topological edge state

Proceedings of the National Academy of Sciences of the United States of America, v. 117, (28), July 2020, p. 16214-16218
Jaeck, Berthold; Xie, Yonglong; Bernevig, B. Andrei; Yazdani, Ali
Article

Tunneling Spectroscopy of Quantum Spin Liquids

Physical Review Letters, v. 125, (26), December 2020, article number 267206
Konig, Elio J.; Randeria, Mallika T.; Jaeck, Berthold
Article

2019 2

Observation of a Majorana zero mode in a topologically protected edge channel

Science, v. 346, (6447), June 2019, p. 1255-1259
Jaeck, Berthold; Xie, Yonglong; Li, Jian; Jeon, Sangjun; Bernevig, B. Andrei; Yazdani, Ali
Article

Spectroscopic signatures of many-body correlations in magic-angle twisted bilayer graphene

Nature, v. 572, (7767), August 2019, p. 101-105
Xie, Yonglong; Lian, Biao; Jaeck, Berthold; Liu, Xiaomeng; Chiu, Cheng-Li; Watanabe, Kenji; Taniguchi, Takashi; Bernevig, B. Andrei; Yazdani, Ali
Article

2017 1

Quantum Brownian Motion at Strong Dissipation Probed by Superconducting Tunnel Junctions

Physical Review Letters, v. 119, (14), October 2017, article number 147702
Jaeck, Berthold; Senkpiel, Jacob; Etzkorn, Markus; Ankerhold, Joachim; Ast, Christian R.; Kern, Klaus
Article

2016 2

Critical Josephson current in the dynamical Coulomb blockade regime

Physical Review B, v. 93, (2), January 2016, article number 020504
Jäck, Berthold; Eltschka, Matthias; Assig, Maximilian; Etzkorn, Markus; Ast, Christian R.; Kern, Klaus
Article

Sensing the quantum limit in scanning tunnelling spectroscopy

Nature Communications, v. 7, October 2016, article number 13009
Ast, Christian R.; Jaeck, Berthold; Senkpiel, Jacob; Eltschka, Matthias; Etzkorn, Markus; Ankerhold, Joachim; Kern, Klaus
Article

2015 2

A nanoscale gigahertz source realized with Josephson scanning tunneling microscopy

Applied Physics Letters, v. 106, (1), January 2015, article number 013109
Jaeck, Berthold; Eltschka, Matthias; Assig, Maximilian; Hardock, Andreas; Etzkorn, Markus; Ast, Christian R.; Kern, Klaus
Article

Superconducting scanning tunneling microscopy tips in a magnetic field: Geometry-controlled order of the phase transition

Applied Physics Letters, v. 107, (12), September 2015, article number 122601
Eltschka, Matthias; Jaeck, Berthold; Assig, Maximilian; Kondrashov, Oleg V.; Skvortsov, Mikhail A.; Etzkorn, Markus; Ast, Christian R.; Kern, Klaus
Article

2014 1

Probing absolute spin polarization at the nanoscale

Nano Letters, v. 14, (12), December 2014, p. 7171-7174
Eltschka, Matthias; Jaeck, Berthold; Assig, Maximilian; Kondrashov, Oleg V.; Skvortsov, Mikhail A.; Etzkorn, Markus; Ast, Christian R.; Kern, Klaus
Article

2012 1

Excitation dynamics in low band gap donor-acceptor copolymers and blends

Advanced Energy Materials, v. 2, (12), December 2012, p. 1477-1482
Gieseking, Björn; Jaeck, Berthold; Preis, Eduard; Jung, Stefan; Forster, Michael; Scherf, Ullrich; Deibel, Carsten; Dyakonov, Vladimir
Article

Article 1

Experimental Evidence for a Berry Curvature Quadrupole in an Antiferromagnet

Physical Review X, v. 14, (2), June 2024, article number 021046
Sankar, Soumya; Liu, Ruizi; Zhang, Chengping; Li, Qi-fang; Chen, Caiyun; Gao, Xuejian; Zheng, Jiangchang; Lin, Yi-hsin; Qian, Kun; Yu, Ruo-Peng; Zhang, Xu; Meng, Zi Yang; Law, Kam Tuen; Shao, Qiming; Jaeck, Berthold

Article 2

Grain size in low loss superconducting Ta thin films on c axis sapphire

Journal of Applied Physics, v. 134, (14), October 2023, article number 144402
Jones, Sarah Garcia; Materise, Nicholas; Leung, Ka Wun Casey; Weber, Joel C.; Isakov, Brian D.; Chen, Xi; Zheng, Jiangchang; Gyenis, András; Jaeck, Berthold; McRae, Corey Rae H.

Visualizing the localized electrons of a kagome flat band

Physical Review Research, v. 5, (4), October 2023 , article number 043269
Chen, Caiyun; Zheng, Jiangchang; Yu, Ruopeng; Sankar, Soumya; Law, Kam Tuen; Po, Hoi Chun; Jaeck, Berthold

Conference paper 1

Mapping out the topological phase diagram of FeSn

Sankar, Soumya; Liu, Ruizi; Zhang, Chengping; Li, Qifang; Qian, Kun; Zheng, Jiangchang; Chen, Caiyun; Meng, Zi Yang; Law, Kam Tuen; Shao, Qiming; Jaeck, Berthold

Article 2

Evidence for a monolayer excitonic insulator

Nature Physics, v. 18, (1), January 2022, p. 87-93
Jia, Yanyu; Wang, Pengjie; Chiu, Chen-Li; Song, Zhida; Yu, Guo; Jaeck, Berthold; Lei, Shiming; Klemenz, Sebastian; Cevallos, Alexandre F.; Onyszczak, Michael; Fishchenko, Nadezhda; Liu, Xiaomeng; Farahi, Gelareh; Xie, Fang; Xu, Yuanfeng; Watanabe, Kenji; Taniguchi, Takeshi; Bernevig, B. Andrei; Cava, Robert J.; Schoop, Leslie M.; Yazdani, Ali; Wu, Sanfeng

Evidence for isotropic s-wave superconductivity in high-entropy alloys

Scientific Reports, v. 12, (1), July 2022, article number 12773
Leung, Ka Wun Casey; Zhang, Xiaofu; von Rohr, Fabian; Lortz, Rolf Walter; Jaeck, Berthold

Article 4

Detecting And Distinguishing Majorana Zero Modes With The Scanning Tunnelling Microscope

Nature Reviews Physics, v. 3, (8), August 2021, p. 541-554
Jaeck, Berthold; Xie, Yonglong; Yazdani, Ali

Microscopic relaxation channels in materials for superconducting qubits

Communications Materials, v. 2, (1), July 2021, article number 72
Premkumar, Anjali; Weiland, Conan; Hwang, Sooyeon; Jaeck, Berthold; Place, Alexander P.M.; Waluyo, Iradwikanari; Hunt, Adrian; Bisogni, Valentina; Pellicari, Jonathan; Barbour, Andi; Miller, Mike S.; Russo, Paola; Camino, Fernando; Kisslinger, Kim; Tong, Xiao; Hybertsen, Mark. S.; Houck, Andrew A.; Jarrige, Ignacio

New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds

Nature Communications, v. 12, March 2021, article number 1779
Place, Alexander P.M.; Rpdgers, Lila V.H.; Mundada, Pranav; Smitham, Basil M.; Fitzpatrick, Mattias; Leng, Zhaoqi; Premkumar, Anjali; Bryon, Jacob; Vrajitorea, Andrei; Sussman, Sara; Cheng, Guangming; Madhavan, Trisha; Babla, Harshvardhan K.; Le, Xuan Hoang; Gang, Youqi; Jaeck, Berthold; Gyenis, Andras; Yao, Nan; Cava, Robert J.; De leon, Nathalie P.; Houck, Andrew A.

Visualizing the multifractal wave functions of a disordered two-dimensional electron gas

Physical Review Research, v. 3, (1), Janaury-March 2021, article number 013022
Jaeck, Berthold; Zinser, Fabian; Konig, Elio J.; Wissing, Sune N.P.; Schmidt, Anke B.; Donath, Markus; Kern, Klaus; Ast, Christine R.

Conference paper 1

New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds

Place, Alexander; Rodgers, Lila; Dutta, Aveek; Mundada, Pranav; Smitham, Basil; Fitzpatrick, Mattias V.; Leng, Zhaoqi; Premkumar, Anjali; Bryon, Jacob Elvin; Sussman, Sara; Cheng, Guangming; Madhavan, Trisha N.; Babla, Harshvardhan; Jaeck, Berthold; Gyenis, Andras; Yao, Nan; Cava, Robert; De Leon, Nathalie; Houck, Andrew

Article 2

Observation of backscattering induced by magnetism in a topological edge state

Proceedings of the National Academy of Sciences of the United States of America, v. 117, (28), July 2020, p. 16214-16218
Jaeck, Berthold; Xie, Yonglong; Bernevig, B. Andrei; Yazdani, Ali

Tunneling Spectroscopy of Quantum Spin Liquids

Physical Review Letters, v. 125, (26), December 2020, article number 267206
Konig, Elio J.; Randeria, Mallika T.; Jaeck, Berthold

Article 2

Observation of a Majorana zero mode in a topologically protected edge channel

Science, v. 346, (6447), June 2019, p. 1255-1259
Jaeck, Berthold; Xie, Yonglong; Li, Jian; Jeon, Sangjun; Bernevig, B. Andrei; Yazdani, Ali

Spectroscopic signatures of many-body correlations in magic-angle twisted bilayer graphene

Nature, v. 572, (7767), August 2019, p. 101-105
Xie, Yonglong; Lian, Biao; Jaeck, Berthold; Liu, Xiaomeng; Chiu, Cheng-Li; Watanabe, Kenji; Taniguchi, Takashi; Bernevig, B. Andrei; Yazdani, Ali

Article 1

Quantum Brownian Motion at Strong Dissipation Probed by Superconducting Tunnel Junctions

Physical Review Letters, v. 119, (14), October 2017, article number 147702
Jaeck, Berthold; Senkpiel, Jacob; Etzkorn, Markus; Ankerhold, Joachim; Ast, Christian R.; Kern, Klaus

Article 2

Critical Josephson current in the dynamical Coulomb blockade regime

Physical Review B, v. 93, (2), January 2016, article number 020504
Jäck, Berthold; Eltschka, Matthias; Assig, Maximilian; Etzkorn, Markus; Ast, Christian R.; Kern, Klaus

Sensing the quantum limit in scanning tunnelling spectroscopy

Nature Communications, v. 7, October 2016, article number 13009
Ast, Christian R.; Jaeck, Berthold; Senkpiel, Jacob; Eltschka, Matthias; Etzkorn, Markus; Ankerhold, Joachim; Kern, Klaus

Article 2

A nanoscale gigahertz source realized with Josephson scanning tunneling microscopy

Applied Physics Letters, v. 106, (1), January 2015, article number 013109
Jaeck, Berthold; Eltschka, Matthias; Assig, Maximilian; Hardock, Andreas; Etzkorn, Markus; Ast, Christian R.; Kern, Klaus

Superconducting scanning tunneling microscopy tips in a magnetic field: Geometry-controlled order of the phase transition

Applied Physics Letters, v. 107, (12), September 2015, article number 122601
Eltschka, Matthias; Jaeck, Berthold; Assig, Maximilian; Kondrashov, Oleg V.; Skvortsov, Mikhail A.; Etzkorn, Markus; Ast, Christian R.; Kern, Klaus

Article 1

Probing absolute spin polarization at the nanoscale

Nano Letters, v. 14, (12), December 2014, p. 7171-7174
Eltschka, Matthias; Jaeck, Berthold; Assig, Maximilian; Kondrashov, Oleg V.; Skvortsov, Mikhail A.; Etzkorn, Markus; Ast, Christian R.; Kern, Klaus

Article 1

Excitation dynamics in low band gap donor-acceptor copolymers and blends

Advanced Energy Materials, v. 2, (12), December 2012, p. 1477-1482
Gieseking, Björn; Jaeck, Berthold; Preis, Eduard; Jung, Stefan; Forster, Michael; Scherf, Ullrich; Deibel, Carsten; Dyakonov, Vladimir

2019 2

Observation of a Majorana zero mode in a topologically protected edge channel

Science, v. 346, (6447), June 2019, p. 1255-1259
Jaeck, Berthold; Xie, Yonglong; Li, Jian; Jeon, Sangjun; Bernevig, B. Andrei; Yazdani, Ali
Article

Spectroscopic signatures of many-body correlations in magic-angle twisted bilayer graphene

Nature, v. 572, (7767), August 2019, p. 101-105
Xie, Yonglong; Lian, Biao; Jaeck, Berthold; Liu, Xiaomeng; Chiu, Cheng-Li; Watanabe, Kenji; Taniguchi, Takashi; Bernevig, B. Andrei; Yazdani, Ali
Article

2017 1

Quantum Brownian Motion at Strong Dissipation Probed by Superconducting Tunnel Junctions

Physical Review Letters, v. 119, (14), October 2017, article number 147702
Jaeck, Berthold; Senkpiel, Jacob; Etzkorn, Markus; Ankerhold, Joachim; Ast, Christian R.; Kern, Klaus
Article

2016 2

Critical Josephson current in the dynamical Coulomb blockade regime

Physical Review B, v. 93, (2), January 2016, article number 020504
Jäck, Berthold; Eltschka, Matthias; Assig, Maximilian; Etzkorn, Markus; Ast, Christian R.; Kern, Klaus
Article

Sensing the quantum limit in scanning tunnelling spectroscopy

Nature Communications, v. 7, October 2016, article number 13009
Ast, Christian R.; Jaeck, Berthold; Senkpiel, Jacob; Eltschka, Matthias; Etzkorn, Markus; Ankerhold, Joachim; Kern, Klaus
Article

2015 2

A nanoscale gigahertz source realized with Josephson scanning tunneling microscopy

Applied Physics Letters, v. 106, (1), January 2015, article number 013109
Jaeck, Berthold; Eltschka, Matthias; Assig, Maximilian; Hardock, Andreas; Etzkorn, Markus; Ast, Christian R.; Kern, Klaus
Article

Superconducting scanning tunneling microscopy tips in a magnetic field: Geometry-controlled order of the phase transition

Applied Physics Letters, v. 107, (12), September 2015, article number 122601
Eltschka, Matthias; Jaeck, Berthold; Assig, Maximilian; Kondrashov, Oleg V.; Skvortsov, Mikhail A.; Etzkorn, Markus; Ast, Christian R.; Kern, Klaus
Article

2014 1

Probing absolute spin polarization at the nanoscale

Nano Letters, v. 14, (12), December 2014, p. 7171-7174
Eltschka, Matthias; Jaeck, Berthold; Assig, Maximilian; Kondrashov, Oleg V.; Skvortsov, Mikhail A.; Etzkorn, Markus; Ast, Christian R.; Kern, Klaus
Article

2012 1

Excitation dynamics in low band gap donor-acceptor copolymers and blends

Advanced Energy Materials, v. 2, (12), December 2012, p. 1477-1482
Gieseking, Björn; Jaeck, Berthold; Preis, Eduard; Jung, Stefan; Forster, Michael; Scherf, Ullrich; Deibel, Carsten; Dyakonov, Vladimir
Article

No Publications

Teaching Assignment

PHYS1314	Honors General Physics II
PHYS4090B	Directed Studies in Physics III
PHYS4291	Capstone Research
SCIE3500	IRE Research Project I
SCIE4500	IRE Research Project II
UROP1100O	Undergraduate Research Opportunities Series 1
UROP2100O	Undergraduate Research Opportunities Series 2

PHYS1003	Energy and Related Environmental Issues
PHYS2080	Physics Seminar and Tutorial I
PHYS2090B	Directed Studies in Physics I
PHYS3090A	Directed Studies in Physics II
PHYS3090B	Directed Studies in Physics II
PHYS4291	Capstone Research
SCIE3500	IRE Research Project I
UROP1100N	Undergraduate Research Opportunities Series 1
UROP2100N	Undergraduate Research Opportunities Series 2

UROP1000

Undergraduate Research Opportunities

PHYS1314	Honors General Physics II
PHYS2090B	Directed Studies in Physics I
PHYS4090B	Directed Studies in Physics III
SCIE2500	Guided Study on Research II
SCIE4500	IRE Research Project II
UROP1100L	Undergraduate Research Opportunities Series 1

No Teaching Assignments

Research Postgraduate (RPG) Supervision

From January 2022 to December 2025 (As of 25 May 2025)

Current RPGs

Doctor of Philosophy

JIANG, Yuqi
Physics
LIU, Junwei
Physics
QIN, Yuqi
Physics
LI, Luanjing
Physics
WEI, Yizhou
Physics
SANKAR, Soumya
Physics
ZHENG, Jiangchang
Physics

Projects

From January 2023 to December 2025

Microscopic insights into the integer and fractional quantum anomalous Hall states of twisted bilayer MoTe2

轉角雙層MoTe2整數和分數量子反常霍爾態的掃描探針顯微鏡研究 Leading

RGC - General Research Fund
Project Team (HKUST)
JÄCK Berthold (Lead)

DAI Xi

LEI Shiming

WANG Ning
2025 -
Sponsorship of Conferences and Symposia Leading

Croucher Foundation
Project Team (HKUST)
JÄCK Berthold (Lead)
2024 - 2024
Emerging quantum phases in itinerant magnetic materials with novel electronic and magnetic properties

巡遊磁性材料的新穎電磁特性及量子態 Leading

RGC - Collaborative Research Fund
Project Team (HKUST)
JÄCK Berthold (Lead)

LIU Junwei

LORTZ Rolf Walter
2023 -
Many-body paradigm in quantum moiré material research

量子摩爾材料多體研究範式 Participating

RGC - Collaborative Research Fund
Project Team (HKUST)
JÄCK Berthold
2023 -
Microscopic Insights into Superconductivity in Magic Angle Twisted Bilayer Graphene

魔角扭曲雙層石墨烯超導性的STM研究 Leading

RGC - General Research Fund
Project Team (HKUST)
JÄCK Berthold (Lead)

LAW Kam Tuen

WANG Ning
2023 -
Quantum Materials by Design Atomic Scale Insights on Epitaxially Grown Thin Films Leading

Croucher Foundation
Project Team (HKUST)
JÄCK Berthold (Lead)
2022 -
Visualizing emergent quantum phases of matter in two-dimensional kagome metals

可視化二維籠紋金屬中的新興量子相 Leading

RGC - Early Career Scheme
Project Team (HKUST)
JÄCK Berthold (Lead)
2021 - 2024

Research Interest

Publications

2024 1

2023 3

2022 2

2021 5

2020 2

2019 2

2017 1

2016 2

2015 2

2014 1

2012 1

Article 1

Article 2

Conference paper 1

Article 2

Article 4

Conference paper 1

Article 2

Article 2

Article 1

Article 2

Article 2

Article 1

Article 1

2019 2

2017 1

2016 2

2015 2

2014 1

2012 1

Teaching Assignment

Research Postgraduate (RPG) Supervision

From January 2022 to December 2025 (As of 25 May 2025)

Current RPGs

Projects

From January 2023 to December 2025

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