title: Zeeman splitting and dynamical mass generation in Dirac semimetal ZrTe5.
abstract: Dirac semimetals have attracted extensive attentions in recent years. It has been theoretically suggested that many-body interactions may drive exotic phase transitions, spontaneously generating a Dirac mass for the nominally massless Dirac electrons. So far, signature of interaction-driven transition has been lacking. In this work, we report high-magnetic-field transport measurements of the Dirac semimetal candidate ZrTe5. Owing to the large g factor in ZrTe5, the Zeeman splitting can be observed at magnetic field as low as 3 T. Most prominently, high pulsed magnetic field up to 60 T drives the system into the ultra-quantum limit, where we observe abrupt changes in the magnetoresistance, indicating field-induced phase transitions. This is interpreted as an interaction-induced spontaneous mass generation of the Dirac fermions, which bears resemblance to the dynamical mass generation of nucleons in high-energy physics. Our work establishes Dirac semimetals as ideal platforms for investigating emerging correlation effects in topological matters.
authors: State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China.|Department of Physics, Fudan University, Shanghai 200433, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors: Yanwen
authors: Y
authors: Liu
authors: State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China.|Department of Physics, Fudan University, Shanghai 200433, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors: Xiang
authors: X
authors: Yuan
authors: State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China.|Department of Physics, Fudan University, Shanghai 200433, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors: Cheng
authors: 0000-0002-9882-1952
authors: C
authors: Zhang
authors: Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China.
authors: Zhao
authors: Z
authors: Jin
authors: School of Physics, AMBER and CRANN Institute, Trinity College, Dublin 2, Ireland.|Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
authors: Awadhesh
authors: A
authors: Narayan
authors: Shanghai Key Laboratory of Multidimensional Information Processing, Department of Electrical Engineering, East China Normal University, Shanghai 200241, China.
authors: Chen
authors: C
authors: Luo
authors: Materials Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia.
authors: Zhigang
authors: Z
authors: Chen
authors: Materials Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia.
authors: Lei
authors: L
authors: Yang
authors: Materials Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia.|Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, Queensland 4072, Australia.
authors: Jin
authors: J
authors: Zou
authors: Shanghai Key Laboratory of Multidimensional Information Processing, Department of Electrical Engineering, East China Normal University, Shanghai 200241, China.
authors: Xing
authors: X
authors: Wu
authors: School of Physics, AMBER and CRANN Institute, Trinity College, Dublin 2, Ireland.
authors: Stefano
authors: S
authors: Sanvito
authors: Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China.
authors: Zhengcai
authors: Z
authors: Xia
authors: Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China.
authors: Liang
authors: L
authors: Li
authors: Institute for Advanced Study, Tsinghua University, Beijing 100084, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
authors: Zhong
authors: Z
authors: Wang
authors: State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China.|Department of Physics, Fudan University, Shanghai 200433, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors: Faxian
authors: F
authors: Xiu